10898 lines
296 KiB
Markdown
10898 lines
296 KiB
Markdown
# <a href="https://lodash.com/">lodash</a> <span>v4.13.1</span>
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## `Array`
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* <a href="#_chunkarray-size1">`_.chunk`</a>
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* <a href="#_compactarray">`_.compact`</a>
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* <a href="#_concatarray-values">`_.concat`</a>
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* <a href="#_differencearray-values">`_.difference`</a>
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* <a href="#_differencebyarray-values-iteratee_identity">`_.differenceBy`</a>
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* <a href="#_differencewitharray-values-comparator">`_.differenceWith`</a>
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* <a href="#_droparray-n1">`_.drop`</a>
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* <a href="#_droprightarray-n1">`_.dropRight`</a>
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* <a href="#_droprightwhilearray-predicate_identity">`_.dropRightWhile`</a>
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* <a href="#_dropwhilearray-predicate_identity">`_.dropWhile`</a>
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* <a href="#_fillarray-value-start0-endarraylength">`_.fill`</a>
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* <a href="#_findindexarray-predicate_identity-fromindex0">`_.findIndex`</a>
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* <a href="#_findlastindexarray-predicate_identity-fromindexarraylength-1">`_.findLastIndex`</a>
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* <a href="#_headarray" class="alias">`_.first` -> `head`</a>
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* <a href="#_flattenarray">`_.flatten`</a>
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* <a href="#_flattendeeparray">`_.flattenDeep`</a>
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* <a href="#_flattendeptharray-depth1">`_.flattenDepth`</a>
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* <a href="#_frompairspairs">`_.fromPairs`</a>
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* <a href="#_headarray">`_.head`</a>
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* <a href="#_indexofarray-value-fromindex0">`_.indexOf`</a>
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* <a href="#_initialarray">`_.initial`</a>
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* <a href="#_intersectionarrays">`_.intersection`</a>
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* <a href="#_intersectionbyarrays-iteratee_identity">`_.intersectionBy`</a>
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* <a href="#_intersectionwitharrays-comparator">`_.intersectionWith`</a>
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* <a href="#_joinarray-separator-">`_.join`</a>
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* <a href="#_lastarray">`_.last`</a>
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* <a href="#_lastindexofarray-value-fromindexarraylength-1">`_.lastIndexOf`</a>
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* <a href="#_ntharray-n0">`_.nth`</a>
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* <a href="#_pullarray-values">`_.pull`</a>
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* <a href="#_pullallarray-values">`_.pullAll`</a>
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* <a href="#_pullallbyarray-values-iteratee_identity">`_.pullAllBy`</a>
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* <a href="#_pullallwitharray-values-comparator">`_.pullAllWith`</a>
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* <a href="#_pullatarray-indexes">`_.pullAt`</a>
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* <a href="#_removearray-predicate_identity">`_.remove`</a>
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* <a href="#_reversearray">`_.reverse`</a>
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* <a href="#_slicearray-start0-endarraylength">`_.slice`</a>
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* <a href="#_sortedindexarray-value">`_.sortedIndex`</a>
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* <a href="#_sortedindexbyarray-value-iteratee_identity">`_.sortedIndexBy`</a>
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* <a href="#_sortedindexofarray-value">`_.sortedIndexOf`</a>
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* <a href="#_sortedlastindexarray-value">`_.sortedLastIndex`</a>
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* <a href="#_sortedlastindexbyarray-value-iteratee_identity">`_.sortedLastIndexBy`</a>
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* <a href="#_sortedlastindexofarray-value">`_.sortedLastIndexOf`</a>
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* <a href="#_sorteduniqarray">`_.sortedUniq`</a>
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* <a href="#_sorteduniqbyarray-iteratee">`_.sortedUniqBy`</a>
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* <a href="#_tailarray">`_.tail`</a>
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* <a href="#_takearray-n1">`_.take`</a>
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* <a href="#_takerightarray-n1">`_.takeRight`</a>
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* <a href="#_takerightwhilearray-predicate_identity">`_.takeRightWhile`</a>
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* <a href="#_takewhilearray-predicate_identity">`_.takeWhile`</a>
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* <a href="#_unionarrays">`_.union`</a>
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* <a href="#_unionbyarrays-iteratee_identity">`_.unionBy`</a>
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* <a href="#_unionwitharrays-comparator">`_.unionWith`</a>
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* <a href="#_uniqarray">`_.uniq`</a>
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* <a href="#_uniqbyarray-iteratee_identity">`_.uniqBy`</a>
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* <a href="#_uniqwitharray-comparator">`_.uniqWith`</a>
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* <a href="#_unziparray">`_.unzip`</a>
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* <a href="#_unzipwitharray-iteratee_identity">`_.unzipWith`</a>
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* <a href="#_withoutarray-values">`_.without`</a>
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* <a href="#_xorarrays">`_.xor`</a>
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* <a href="#_xorbyarrays-iteratee_identity">`_.xorBy`</a>
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* <a href="#_xorwitharrays-comparator">`_.xorWith`</a>
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* <a href="#_ziparrays">`_.zip`</a>
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* <a href="#_zipobjectprops-values">`_.zipObject`</a>
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* <a href="#_zipobjectdeepprops-values">`_.zipObjectDeep`</a>
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* <a href="#_zipwitharrays-iteratee_identity">`_.zipWith`</a>
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## `Collection`
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* <a href="#_countbycollection-iteratee_identity">`_.countBy`</a>
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* <a href="#_foreachcollection-iteratee_identity" class="alias">`_.each` -> `forEach`</a>
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* <a href="#_foreachrightcollection-iteratee_identity" class="alias">`_.eachRight` -> `forEachRight`</a>
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* <a href="#_everycollection-predicate_identity">`_.every`</a>
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* <a href="#_filtercollection-predicate_identity">`_.filter`</a>
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* <a href="#_findcollection-predicate_identity-fromindex0">`_.find`</a>
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* <a href="#_findlastcollection-predicate_identity-fromindexcollectionlength-1">`_.findLast`</a>
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* <a href="#_flatmapcollection-iteratee_identity">`_.flatMap`</a>
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* <a href="#_flatmapdeepcollection-iteratee_identity">`_.flatMapDeep`</a>
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* <a href="#_flatmapdepthcollection-iteratee_identity-depth1">`_.flatMapDepth`</a>
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* <a href="#_foreachcollection-iteratee_identity">`_.forEach`</a>
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* <a href="#_foreachrightcollection-iteratee_identity">`_.forEachRight`</a>
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* <a href="#_groupbycollection-iteratee_identity">`_.groupBy`</a>
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* <a href="#_includescollection-value-fromindex0">`_.includes`</a>
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* <a href="#_invokemapcollection-path-args">`_.invokeMap`</a>
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* <a href="#_keybycollection-iteratee_identity">`_.keyBy`</a>
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* <a href="#_mapcollection-iteratee_identity">`_.map`</a>
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* <a href="#_orderbycollection-iteratees_identity-orders">`_.orderBy`</a>
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* <a href="#_partitioncollection-predicate_identity">`_.partition`</a>
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* <a href="#_reducecollection-iteratee_identity-accumulator">`_.reduce`</a>
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* <a href="#_reducerightcollection-iteratee_identity-accumulator">`_.reduceRight`</a>
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* <a href="#_rejectcollection-predicate_identity">`_.reject`</a>
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* <a href="#_samplecollection">`_.sample`</a>
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* <a href="#_samplesizecollection-n1">`_.sampleSize`</a>
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* <a href="#_shufflecollection">`_.shuffle`</a>
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* <a href="#_sizecollection">`_.size`</a>
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* <a href="#_somecollection-predicate_identity">`_.some`</a>
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* <a href="#_sortbycollection-iteratees_identity">`_.sortBy`</a>
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## `Date`
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* <a href="#_now">`_.now`</a>
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## `Function`
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* <a href="#_aftern-func">`_.after`</a>
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* <a href="#_aryfunc-nfunclength">`_.ary`</a>
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* <a href="#_beforen-func">`_.before`</a>
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* <a href="#_bindfunc-thisarg-partials">`_.bind`</a>
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* <a href="#_bindkeyobject-key-partials">`_.bindKey`</a>
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* <a href="#_curryfunc-arityfunclength">`_.curry`</a>
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* <a href="#_curryrightfunc-arityfunclength">`_.curryRight`</a>
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* <a href="#_debouncefunc-wait0-options-optionsleadingfalse-optionsmaxwait-optionstrailingtrue">`_.debounce`</a>
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* <a href="#_deferfunc-args">`_.defer`</a>
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* <a href="#_delayfunc-wait-args">`_.delay`</a>
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* <a href="#_flipfunc">`_.flip`</a>
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* <a href="#_memoizefunc-resolver">`_.memoize`</a>
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* <a href="#_negatepredicate">`_.negate`</a>
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* <a href="#_oncefunc">`_.once`</a>
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* <a href="#_overargsfunc">`_.overArgs`</a>
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* <a href="#_partialfunc-partials">`_.partial`</a>
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* <a href="#_partialrightfunc-partials">`_.partialRight`</a>
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* <a href="#_reargfunc-indexes">`_.rearg`</a>
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* <a href="#_restfunc-startfunclength-1">`_.rest`</a>
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* <a href="#_spreadfunc-start0">`_.spread`</a>
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* <a href="#_throttlefunc-wait0-options-optionsleadingtrue-optionstrailingtrue">`_.throttle`</a>
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* <a href="#_unaryfunc">`_.unary`</a>
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* <a href="#_wrapvalue-wrapperidentity">`_.wrap`</a>
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## `Lang`
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* <a href="#_castarrayvalue">`_.castArray`</a>
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* <a href="#_clonevalue">`_.clone`</a>
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* <a href="#_clonedeepvalue">`_.cloneDeep`</a>
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* <a href="#_clonedeepwithvalue-customizer">`_.cloneDeepWith`</a>
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* <a href="#_clonewithvalue-customizer">`_.cloneWith`</a>
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* <a href="#_eqvalue-other">`_.eq`</a>
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* <a href="#_gtvalue-other">`_.gt`</a>
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* <a href="#_gtevalue-other">`_.gte`</a>
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* <a href="#_isargumentsvalue">`_.isArguments`</a>
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* <a href="#_isarrayvalue">`_.isArray`</a>
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* <a href="#_isarraybuffervalue">`_.isArrayBuffer`</a>
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* <a href="#_isarraylikevalue">`_.isArrayLike`</a>
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* <a href="#_isarraylikeobjectvalue">`_.isArrayLikeObject`</a>
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* <a href="#_isbooleanvalue">`_.isBoolean`</a>
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* <a href="#_isbuffervalue">`_.isBuffer`</a>
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* <a href="#_isdatevalue">`_.isDate`</a>
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* <a href="#_iselementvalue">`_.isElement`</a>
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* <a href="#_isemptyvalue">`_.isEmpty`</a>
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* <a href="#_isequalvalue-other">`_.isEqual`</a>
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* <a href="#_isequalwithvalue-other-customizer">`_.isEqualWith`</a>
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* <a href="#_iserrorvalue">`_.isError`</a>
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* <a href="#_isfinitevalue">`_.isFinite`</a>
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* <a href="#_isfunctionvalue">`_.isFunction`</a>
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* <a href="#_isintegervalue">`_.isInteger`</a>
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* <a href="#_islengthvalue">`_.isLength`</a>
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* <a href="#_ismapvalue">`_.isMap`</a>
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* <a href="#_ismatchobject-source">`_.isMatch`</a>
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* <a href="#_ismatchwithobject-source-customizer">`_.isMatchWith`</a>
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* <a href="#_isnanvalue">`_.isNaN`</a>
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* <a href="#_isnativevalue">`_.isNative`</a>
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* <a href="#_isnilvalue">`_.isNil`</a>
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* <a href="#_isnullvalue">`_.isNull`</a>
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* <a href="#_isnumbervalue">`_.isNumber`</a>
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* <a href="#_isobjectvalue">`_.isObject`</a>
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* <a href="#_isobjectlikevalue">`_.isObjectLike`</a>
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* <a href="#_isplainobjectvalue">`_.isPlainObject`</a>
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* <a href="#_isregexpvalue">`_.isRegExp`</a>
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* <a href="#_issafeintegervalue">`_.isSafeInteger`</a>
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* <a href="#_issetvalue">`_.isSet`</a>
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* <a href="#_isstringvalue">`_.isString`</a>
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* <a href="#_issymbolvalue">`_.isSymbol`</a>
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* <a href="#_istypedarrayvalue">`_.isTypedArray`</a>
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* <a href="#_isundefinedvalue">`_.isUndefined`</a>
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* <a href="#_isweakmapvalue">`_.isWeakMap`</a>
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* <a href="#_isweaksetvalue">`_.isWeakSet`</a>
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* <a href="#_ltvalue-other">`_.lt`</a>
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* <a href="#_ltevalue-other">`_.lte`</a>
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* <a href="#_toarrayvalue">`_.toArray`</a>
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* <a href="#_tofinitevalue">`_.toFinite`</a>
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* <a href="#_tointegervalue">`_.toInteger`</a>
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* <a href="#_tolengthvalue">`_.toLength`</a>
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* <a href="#_tonumbervalue">`_.toNumber`</a>
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* <a href="#_toplainobjectvalue">`_.toPlainObject`</a>
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* <a href="#_tosafeintegervalue">`_.toSafeInteger`</a>
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* <a href="#_tostringvalue">`_.toString`</a>
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## `Math`
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* <a href="#_addaugend-addend">`_.add`</a>
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* <a href="#_ceilnumber-precision0">`_.ceil`</a>
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* <a href="#_dividedividend-divisor">`_.divide`</a>
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* <a href="#_floornumber-precision0">`_.floor`</a>
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* <a href="#_maxarray">`_.max`</a>
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* <a href="#_maxbyarray-iteratee_identity">`_.maxBy`</a>
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* <a href="#_meanarray">`_.mean`</a>
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* <a href="#_meanbyarray-iteratee_identity">`_.meanBy`</a>
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* <a href="#_minarray">`_.min`</a>
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* <a href="#_minbyarray-iteratee_identity">`_.minBy`</a>
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* <a href="#_multiplymultiplier-multiplicand">`_.multiply`</a>
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* <a href="#_roundnumber-precision0">`_.round`</a>
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* <a href="#_subtractminuend-subtrahend">`_.subtract`</a>
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* <a href="#_sumarray">`_.sum`</a>
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* <a href="#_sumbyarray-iteratee_identity">`_.sumBy`</a>
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<!-- /div -->
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## `Number`
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* <a href="#_clampnumber-lower-upper">`_.clamp`</a>
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* <a href="#_inrangenumber-start0-end">`_.inRange`</a>
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* <a href="#_randomlower0-upper1-floating">`_.random`</a>
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## `Object`
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* <a href="#_assignobject-sources">`_.assign`</a>
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* <a href="#_assigninobject-sources">`_.assignIn`</a>
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* <a href="#_assigninwithobject-sources-customizer">`_.assignInWith`</a>
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* <a href="#_assignwithobject-sources-customizer">`_.assignWith`</a>
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* <a href="#_atobject-paths">`_.at`</a>
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* <a href="#_createprototype-properties">`_.create`</a>
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* <a href="#_defaultsobject-sources">`_.defaults`</a>
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* <a href="#_defaultsdeepobject-sources">`_.defaultsDeep`</a>
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* <a href="#_topairsobject" class="alias">`_.entries` -> `toPairs`</a>
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* <a href="#_topairsinobject" class="alias">`_.entriesIn` -> `toPairsIn`</a>
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* <a href="#_assigninobject-sources" class="alias">`_.extend` -> `assignIn`</a>
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* <a href="#_assigninwithobject-sources-customizer" class="alias">`_.extendWith` -> `assignInWith`</a>
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* <a href="#_findkeyobject-predicate_identity">`_.findKey`</a>
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* <a href="#_findlastkeyobject-predicate_identity">`_.findLastKey`</a>
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* <a href="#_forinobject-iteratee_identity">`_.forIn`</a>
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* <a href="#_forinrightobject-iteratee_identity">`_.forInRight`</a>
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* <a href="#_forownobject-iteratee_identity">`_.forOwn`</a>
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* <a href="#_forownrightobject-iteratee_identity">`_.forOwnRight`</a>
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* <a href="#_functionsobject">`_.functions`</a>
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* <a href="#_functionsinobject">`_.functionsIn`</a>
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* <a href="#_getobject-path-defaultvalue">`_.get`</a>
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* <a href="#_hasobject-path">`_.has`</a>
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* <a href="#_hasinobject-path">`_.hasIn`</a>
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* <a href="#_invertobject">`_.invert`</a>
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* <a href="#_invertbyobject-iteratee_identity">`_.invertBy`</a>
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* <a href="#_invokeobject-path-args">`_.invoke`</a>
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* <a href="#_keysobject">`_.keys`</a>
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* <a href="#_keysinobject">`_.keysIn`</a>
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* <a href="#_mapkeysobject-iteratee_identity">`_.mapKeys`</a>
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* <a href="#_mapvaluesobject-iteratee_identity">`_.mapValues`</a>
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* <a href="#_mergeobject-sources">`_.merge`</a>
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* <a href="#_mergewithobject-sources-customizer">`_.mergeWith`</a>
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* <a href="#_omitobject-props">`_.omit`</a>
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* <a href="#_omitbyobject-predicate_identity">`_.omitBy`</a>
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* <a href="#_pickobject-props">`_.pick`</a>
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* <a href="#_pickbyobject-predicate_identity">`_.pickBy`</a>
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* <a href="#_resultobject-path-defaultvalue">`_.result`</a>
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* <a href="#_setobject-path-value">`_.set`</a>
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* <a href="#_setwithobject-path-value-customizer">`_.setWith`</a>
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* <a href="#_topairsobject">`_.toPairs`</a>
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* <a href="#_topairsinobject">`_.toPairsIn`</a>
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* <a href="#_transformobject-iteratee_identity-accumulator">`_.transform`</a>
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* <a href="#_unsetobject-path">`_.unset`</a>
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* <a href="#_updateobject-path-updater">`_.update`</a>
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* <a href="#_updatewithobject-path-updater-customizer">`_.updateWith`</a>
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* <a href="#_valuesobject">`_.values`</a>
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* <a href="#_valuesinobject">`_.valuesIn`</a>
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<!-- /div -->
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<!-- div -->
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## `Seq`
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* <a href="#_value">`_`</a>
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* <a href="#_chainvalue">`_.chain`</a>
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* <a href="#_tapvalue-interceptor">`_.tap`</a>
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* <a href="#_thruvalue-interceptor">`_.thru`</a>
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* <a href="#_prototypesymboliterator">`_.prototype[Symbol.iterator]`</a>
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* <a href="#_prototypeatpaths">`_.prototype.at`</a>
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* <a href="#_prototypechain">`_.prototype.chain`</a>
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* <a href="#_prototypecommit">`_.prototype.commit`</a>
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* <a href="#_prototypenext">`_.prototype.next`</a>
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* <a href="#_prototypeplantvalue">`_.prototype.plant`</a>
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* <a href="#_prototypereverse">`_.prototype.reverse`</a>
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* <a href="#_prototypevalue" class="alias">`_.prototype.toJSON` -> `value`</a>
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* <a href="#_prototypevalue">`_.prototype.value`</a>
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* <a href="#_prototypevalue" class="alias">`_.prototype.valueOf` -> `value`</a>
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<!-- /div -->
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<!-- div -->
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## `String`
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* <a href="#_camelcasestring">`_.camelCase`</a>
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* <a href="#_capitalizestring">`_.capitalize`</a>
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* <a href="#_deburrstring">`_.deburr`</a>
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* <a href="#_endswithstring-target-positionstringlength">`_.endsWith`</a>
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* <a href="#_escapestring">`_.escape`</a>
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* <a href="#_escaperegexpstring">`_.escapeRegExp`</a>
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* <a href="#_kebabcasestring">`_.kebabCase`</a>
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* <a href="#_lowercasestring">`_.lowerCase`</a>
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* <a href="#_lowerfirststring">`_.lowerFirst`</a>
|
|
* <a href="#_padstring-length0-chars">`_.pad`</a>
|
|
* <a href="#_padendstring-length0-chars">`_.padEnd`</a>
|
|
* <a href="#_padstartstring-length0-chars">`_.padStart`</a>
|
|
* <a href="#_parseintstring-radix10">`_.parseInt`</a>
|
|
* <a href="#_repeatstring-n1">`_.repeat`</a>
|
|
* <a href="#_replacestring-pattern-replacement">`_.replace`</a>
|
|
* <a href="#_snakecasestring">`_.snakeCase`</a>
|
|
* <a href="#_splitstring-separator-limit">`_.split`</a>
|
|
* <a href="#_startcasestring">`_.startCase`</a>
|
|
* <a href="#_startswithstring-target-position0">`_.startsWith`</a>
|
|
* <a href="#_templatestring-options-optionsescape_templatesettingsescape-optionsevaluate_templatesettingsevaluate-optionsimports_templatesettingsimports-optionsinterpolate_templatesettingsinterpolate-optionssourceurllodashtemplatesourcesn-optionsvariableobj">`_.template`</a>
|
|
* <a href="#_tolowerstring">`_.toLower`</a>
|
|
* <a href="#_toupperstring">`_.toUpper`</a>
|
|
* <a href="#_trimstring-charswhitespace">`_.trim`</a>
|
|
* <a href="#_trimendstring-charswhitespace">`_.trimEnd`</a>
|
|
* <a href="#_trimstartstring-charswhitespace">`_.trimStart`</a>
|
|
* <a href="#_truncatestring-options-optionslength30-optionsomission-optionsseparator">`_.truncate`</a>
|
|
* <a href="#_unescapestring">`_.unescape`</a>
|
|
* <a href="#_uppercasestring">`_.upperCase`</a>
|
|
* <a href="#_upperfirststring">`_.upperFirst`</a>
|
|
* <a href="#_wordsstring-pattern">`_.words`</a>
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
## `Util`
|
|
* <a href="#_attemptfunc-args">`_.attempt`</a>
|
|
* <a href="#_bindallobject-methodnames">`_.bindAll`</a>
|
|
* <a href="#_condpairs">`_.cond`</a>
|
|
* <a href="#_conformssource">`_.conforms`</a>
|
|
* <a href="#_constantvalue">`_.constant`</a>
|
|
* <a href="#_flowfuncs">`_.flow`</a>
|
|
* <a href="#_flowrightfuncs">`_.flowRight`</a>
|
|
* <a href="#_identityvalue">`_.identity`</a>
|
|
* <a href="#_iterateefunc_identity">`_.iteratee`</a>
|
|
* <a href="#_matchessource">`_.matches`</a>
|
|
* <a href="#_matchespropertypath-srcvalue">`_.matchesProperty`</a>
|
|
* <a href="#_methodpath-args">`_.method`</a>
|
|
* <a href="#_methodofobject-args">`_.methodOf`</a>
|
|
* <a href="#_mixinobjectlodash-source-options-optionschaintrue">`_.mixin`</a>
|
|
* <a href="#_noconflict">`_.noConflict`</a>
|
|
* <a href="#_noop">`_.noop`</a>
|
|
* <a href="#_nthargn0">`_.nthArg`</a>
|
|
* <a href="#_overiteratees_identity">`_.over`</a>
|
|
* <a href="#_overeverypredicates_identity">`_.overEvery`</a>
|
|
* <a href="#_oversomepredicates_identity">`_.overSome`</a>
|
|
* <a href="#_propertypath">`_.property`</a>
|
|
* <a href="#_propertyofobject">`_.propertyOf`</a>
|
|
* <a href="#_rangestart0-end-step1">`_.range`</a>
|
|
* <a href="#_rangerightstart0-end-step1">`_.rangeRight`</a>
|
|
* <a href="#_runincontextcontextroot">`_.runInContext`</a>
|
|
* <a href="#_stubarray">`_.stubArray`</a>
|
|
* <a href="#_stubfalse">`_.stubFalse`</a>
|
|
* <a href="#_stubobject">`_.stubObject`</a>
|
|
* <a href="#_stubstring">`_.stubString`</a>
|
|
* <a href="#_stubtrue">`_.stubTrue`</a>
|
|
* <a href="#_timesn-iteratee_identity">`_.times`</a>
|
|
* <a href="#_topathvalue">`_.toPath`</a>
|
|
* <a href="#_uniqueidprefix">`_.uniqueId`</a>
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
## `Properties`
|
|
* <a href="#_version">`_.VERSION`</a>
|
|
* <a href="#_templatesettings">`_.templateSettings`</a>
|
|
* <a href="#_templatesettingsescape">`_.templateSettings.escape`</a>
|
|
* <a href="#_templatesettingsevaluate">`_.templateSettings.evaluate`</a>
|
|
* <a href="#_templatesettingsimports">`_.templateSettings.imports`</a>
|
|
* <a href="#_templatesettingsinterpolate">`_.templateSettings.interpolate`</a>
|
|
* <a href="#_templatesettingsvariable">`_.templateSettings.variable`</a>
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
## `Methods`
|
|
* <a href="#_templatesettingsimports_">`_.templateSettings.imports._`</a>
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div class="doc-container" -->
|
|
|
|
<!-- div -->
|
|
|
|
## `“Array” Methods`
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_chunkarray-size1"></a>`_.chunk(array, [size=1])`
|
|
<a href="#_chunkarray-size1">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6118 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.chunk "See the npm package")
|
|
|
|
Creates an array of elements split into groups the length of `size`.
|
|
If `array` can't be split evenly, the final chunk will be the remaining
|
|
elements.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to process.
|
|
2. `[size=1]` *(number)*: The length of each chunk
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of chunks.
|
|
|
|
#### Example
|
|
```js
|
|
_.chunk(['a', 'b', 'c', 'd'], 2);
|
|
// => [['a', 'b'], ['c', 'd']]
|
|
|
|
_.chunk(['a', 'b', 'c', 'd'], 3);
|
|
// => [['a', 'b', 'c'], ['d']]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_compactarray"></a>`_.compact(array)`
|
|
<a href="#_compactarray">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6153 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.compact "See the npm package")
|
|
|
|
Creates an array with all falsey values removed. The values `false`, `null`,
|
|
`0`, `""`, `undefined`, and `NaN` are falsey.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to compact.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of filtered values.
|
|
|
|
#### Example
|
|
```js
|
|
_.compact([0, 1, false, 2, '', 3]);
|
|
// => [1, 2, 3]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_concatarray-values"></a>`_.concat(array, [values])`
|
|
<a href="#_concatarray-values">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6190 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.concat "See the npm package")
|
|
|
|
Creates a new array concatenating `array` with any additional arrays
|
|
and/or values.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to concatenate.
|
|
2. `[values]` *(...*)*: The values to concatenate.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new concatenated array.
|
|
|
|
#### Example
|
|
```js
|
|
var array = [1];
|
|
var other = _.concat(array, 2, [3], [[4]]);
|
|
|
|
console.log(other);
|
|
// => [1, 2, 3, [4]]
|
|
|
|
console.log(array);
|
|
// => [1]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_differencearray-values"></a>`_.difference(array, [values])`
|
|
<a href="#_differencearray-values">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6223 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.difference "See the npm package")
|
|
|
|
Creates an array of unique `array` values not included in the other given
|
|
arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
|
|
for equality comparisons. The order of result values is determined by the
|
|
order they occur in the first array.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to inspect.
|
|
2. `[values]` *(...Array)*: The values to exclude.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of filtered values.
|
|
|
|
#### Example
|
|
```js
|
|
_.difference([2, 1], [2, 3]);
|
|
// => [1]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_differencebyarray-values-iteratee_identity"></a>`_.differenceBy(array, [values], [iteratee=_.identity])`
|
|
<a href="#_differencebyarray-values-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6253 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.differenceby "See the npm package")
|
|
|
|
This method is like `_.difference` except that it accepts `iteratee` which
|
|
is invoked for each element of `array` and `values` to generate the criterion
|
|
by which they're compared. Result values are chosen from the first array.
|
|
The iteratee is invoked with one argument: *(value)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to inspect.
|
|
2. `[values]` *(...Array)*: The values to exclude.
|
|
3. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The iteratee invoked per element.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of filtered values.
|
|
|
|
#### Example
|
|
```js
|
|
_.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);
|
|
// => [1.2]
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
|
|
// => [{ 'x': 2 }]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_differencewitharray-values-comparator"></a>`_.differenceWith(array, [values], [comparator])`
|
|
<a href="#_differencewitharray-values-comparator">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6284 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.differencewith "See the npm package")
|
|
|
|
This method is like `_.difference` except that it accepts `comparator`
|
|
which is invoked to compare elements of `array` to `values`. Result values
|
|
are chosen from the first array. The comparator is invoked with two arguments:<br>
|
|
*(arrVal, othVal)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to inspect.
|
|
2. `[values]` *(...Array)*: The values to exclude.
|
|
3. `[comparator]` *(Function)*: The comparator invoked per element.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of filtered values.
|
|
|
|
#### Example
|
|
```js
|
|
var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
|
|
|
|
_.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual);
|
|
// => [{ 'x': 2, 'y': 1 }]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_droparray-n1"></a>`_.drop(array, [n=1])`
|
|
<a href="#_droparray-n1">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6319 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.drop "See the npm package")
|
|
|
|
Creates a slice of `array` with `n` elements dropped from the beginning.
|
|
|
|
#### Since
|
|
0.5.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to query.
|
|
2. `[n=1]` *(number)*: The number of elements to drop.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the slice of `array`.
|
|
|
|
#### Example
|
|
```js
|
|
_.drop([1, 2, 3]);
|
|
// => [2, 3]
|
|
|
|
_.drop([1, 2, 3], 2);
|
|
// => [3]
|
|
|
|
_.drop([1, 2, 3], 5);
|
|
// => []
|
|
|
|
_.drop([1, 2, 3], 0);
|
|
// => [1, 2, 3]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_droprightarray-n1"></a>`_.dropRight(array, [n=1])`
|
|
<a href="#_droprightarray-n1">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6353 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.dropright "See the npm package")
|
|
|
|
Creates a slice of `array` with `n` elements dropped from the end.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to query.
|
|
2. `[n=1]` *(number)*: The number of elements to drop.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the slice of `array`.
|
|
|
|
#### Example
|
|
```js
|
|
_.dropRight([1, 2, 3]);
|
|
// => [1, 2]
|
|
|
|
_.dropRight([1, 2, 3], 2);
|
|
// => [1]
|
|
|
|
_.dropRight([1, 2, 3], 5);
|
|
// => []
|
|
|
|
_.dropRight([1, 2, 3], 0);
|
|
// => [1, 2, 3]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_droprightwhilearray-predicate_identity"></a>`_.dropRightWhile(array, [predicate=_.identity])`
|
|
<a href="#_droprightwhilearray-predicate_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6399 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.droprightwhile "See the npm package")
|
|
|
|
Creates a slice of `array` excluding elements dropped from the end.
|
|
Elements are dropped until `predicate` returns falsey. The predicate is
|
|
invoked with three arguments: *(value, index, array)*.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to query.
|
|
2. `[predicate=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the slice of `array`.
|
|
|
|
#### Example
|
|
```js
|
|
var users = [
|
|
{ 'user': 'barney', 'active': true },
|
|
{ 'user': 'fred', 'active': false },
|
|
{ 'user': 'pebbles', 'active': false }
|
|
];
|
|
|
|
_.dropRightWhile(users, function(o) { return !o.active; });
|
|
// => objects for ['barney']
|
|
|
|
// The `_.matches` iteratee shorthand.
|
|
_.dropRightWhile(users, { 'user': 'pebbles', 'active': false });
|
|
// => objects for ['barney', 'fred']
|
|
|
|
// The `_.matchesProperty` iteratee shorthand.
|
|
_.dropRightWhile(users, ['active', false]);
|
|
// => objects for ['barney']
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.dropRightWhile(users, 'active');
|
|
// => objects for ['barney', 'fred', 'pebbles']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_dropwhilearray-predicate_identity"></a>`_.dropWhile(array, [predicate=_.identity])`
|
|
<a href="#_dropwhilearray-predicate_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6441 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.dropwhile "See the npm package")
|
|
|
|
Creates a slice of `array` excluding elements dropped from the beginning.
|
|
Elements are dropped until `predicate` returns falsey. The predicate is
|
|
invoked with three arguments: *(value, index, array)*.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to query.
|
|
2. `[predicate=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the slice of `array`.
|
|
|
|
#### Example
|
|
```js
|
|
var users = [
|
|
{ 'user': 'barney', 'active': false },
|
|
{ 'user': 'fred', 'active': false },
|
|
{ 'user': 'pebbles', 'active': true }
|
|
];
|
|
|
|
_.dropWhile(users, function(o) { return !o.active; });
|
|
// => objects for ['pebbles']
|
|
|
|
// The `_.matches` iteratee shorthand.
|
|
_.dropWhile(users, { 'user': 'barney', 'active': false });
|
|
// => objects for ['fred', 'pebbles']
|
|
|
|
// The `_.matchesProperty` iteratee shorthand.
|
|
_.dropWhile(users, ['active', false]);
|
|
// => objects for ['pebbles']
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.dropWhile(users, 'active');
|
|
// => objects for ['barney', 'fred', 'pebbles']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_fillarray-value-start0-endarraylength"></a>`_.fill(array, value, [start=0], [end=array.length])`
|
|
<a href="#_fillarray-value-start0-endarraylength">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6476 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.fill "See the npm package")
|
|
|
|
Fills elements of `array` with `value` from `start` up to, but not
|
|
including, `end`.
|
|
<br>
|
|
<br>
|
|
**Note:** This method mutates `array`.
|
|
|
|
#### Since
|
|
3.2.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to fill.
|
|
2. `value` *(*)*: The value to fill `array` with.
|
|
3. `[start=0]` *(number)*: The start position.
|
|
4. `[end=array.length]` *(number)*: The end position.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns `array`.
|
|
|
|
#### Example
|
|
```js
|
|
var array = [1, 2, 3];
|
|
|
|
_.fill(array, 'a');
|
|
console.log(array);
|
|
// => ['a', 'a', 'a']
|
|
|
|
_.fill(Array(3), 2);
|
|
// => [2, 2, 2]
|
|
|
|
_.fill([4, 6, 8, 10], '*', 1, 3);
|
|
// => [4, '*', '*', 10]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_findindexarray-predicate_identity-fromindex0"></a>`_.findIndex(array, [predicate=_.identity], [fromIndex=0])`
|
|
<a href="#_findindexarray-predicate_identity-fromindex0">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6524 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.findindex "See the npm package")
|
|
|
|
This method is like `_.find` except that it returns the index of the first
|
|
element `predicate` returns truthy for instead of the element itself.
|
|
|
|
#### Since
|
|
1.1.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to search.
|
|
2. `[predicate=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
3. `[fromIndex=0]` *(number)*: The index to search from.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the index of the found element, else `-1`.
|
|
|
|
#### Example
|
|
```js
|
|
var users = [
|
|
{ 'user': 'barney', 'active': false },
|
|
{ 'user': 'fred', 'active': false },
|
|
{ 'user': 'pebbles', 'active': true }
|
|
];
|
|
|
|
_.findIndex(users, function(o) { return o.user == 'barney'; });
|
|
// => 0
|
|
|
|
// The `_.matches` iteratee shorthand.
|
|
_.findIndex(users, { 'user': 'fred', 'active': false });
|
|
// => 1
|
|
|
|
// The `_.matchesProperty` iteratee shorthand.
|
|
_.findIndex(users, ['active', false]);
|
|
// => 0
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.findIndex(users, 'active');
|
|
// => 2
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_findlastindexarray-predicate_identity-fromindexarraylength-1"></a>`_.findLastIndex(array, [predicate=_.identity], [fromIndex=array.length-1])`
|
|
<a href="#_findlastindexarray-predicate_identity-fromindexarraylength-1">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6572 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.findlastindex "See the npm package")
|
|
|
|
This method is like `_.findIndex` except that it iterates over elements
|
|
of `collection` from right to left.
|
|
|
|
#### Since
|
|
2.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to search.
|
|
2. `[predicate=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
3. `[fromIndex=array.length-1]` *(number)*: The index to search from.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the index of the found element, else `-1`.
|
|
|
|
#### Example
|
|
```js
|
|
var users = [
|
|
{ 'user': 'barney', 'active': true },
|
|
{ 'user': 'fred', 'active': false },
|
|
{ 'user': 'pebbles', 'active': false }
|
|
];
|
|
|
|
_.findLastIndex(users, function(o) { return o.user == 'pebbles'; });
|
|
// => 2
|
|
|
|
// The `_.matches` iteratee shorthand.
|
|
_.findLastIndex(users, { 'user': 'barney', 'active': true });
|
|
// => 0
|
|
|
|
// The `_.matchesProperty` iteratee shorthand.
|
|
_.findLastIndex(users, ['active', false]);
|
|
// => 2
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.findLastIndex(users, 'active');
|
|
// => 0
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_flattenarray"></a>`_.flatten(array)`
|
|
<a href="#_flattenarray">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6601 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.flatten "See the npm package")
|
|
|
|
Flattens `array` a single level deep.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to flatten.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new flattened array.
|
|
|
|
#### Example
|
|
```js
|
|
_.flatten([1, [2, [3, [4]], 5]]);
|
|
// => [1, 2, [3, [4]], 5]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_flattendeeparray"></a>`_.flattenDeep(array)`
|
|
<a href="#_flattendeeparray">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6620 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.flattendeep "See the npm package")
|
|
|
|
Recursively flattens `array`.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to flatten.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new flattened array.
|
|
|
|
#### Example
|
|
```js
|
|
_.flattenDeep([1, [2, [3, [4]], 5]]);
|
|
// => [1, 2, 3, 4, 5]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_flattendeptharray-depth1"></a>`_.flattenDepth(array, [depth=1])`
|
|
<a href="#_flattendeptharray-depth1">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6645 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.flattendepth "See the npm package")
|
|
|
|
Recursively flatten `array` up to `depth` times.
|
|
|
|
#### Since
|
|
4.4.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to flatten.
|
|
2. `[depth=1]` *(number)*: The maximum recursion depth.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new flattened array.
|
|
|
|
#### Example
|
|
```js
|
|
var array = [1, [2, [3, [4]], 5]];
|
|
|
|
_.flattenDepth(array, 1);
|
|
// => [1, 2, [3, [4]], 5]
|
|
|
|
_.flattenDepth(array, 2);
|
|
// => [1, 2, 3, [4], 5]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_frompairspairs"></a>`_.fromPairs(pairs)`
|
|
<a href="#_frompairspairs">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6669 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.frompairs "See the npm package")
|
|
|
|
The inverse of `_.toPairs`; this method returns an object composed
|
|
from key-value `pairs`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `pairs` *(Array)*: The key-value pairs.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the new object.
|
|
|
|
#### Example
|
|
```js
|
|
_.fromPairs([['fred', 30], ['barney', 40]]);
|
|
// => { 'fred': 30, 'barney': 40 }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_headarray"></a>`_.head(array)`
|
|
<a href="#_headarray">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6699 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.head "See the npm package")
|
|
|
|
Gets the first element of `array`.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Aliases
|
|
*_.first*
|
|
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to query.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the first element of `array`.
|
|
|
|
#### Example
|
|
```js
|
|
_.head([1, 2, 3]);
|
|
// => 1
|
|
|
|
_.head([]);
|
|
// => undefined
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_indexofarray-value-fromindex0"></a>`_.indexOf(array, value, [fromIndex=0])`
|
|
<a href="#_indexofarray-value-fromindex0">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6726 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.indexof "See the npm package")
|
|
|
|
Gets the index at which the first occurrence of `value` is found in `array`
|
|
using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
|
|
for equality comparisons. If `fromIndex` is negative, it's used as the
|
|
offset from the end of `array`.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to search.
|
|
2. `value` *(*)*: The value to search for.
|
|
3. `[fromIndex=0]` *(number)*: The index to search from.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the index of the matched value, else `-1`.
|
|
|
|
#### Example
|
|
```js
|
|
_.indexOf([1, 2, 1, 2], 2);
|
|
// => 1
|
|
|
|
// Search from the `fromIndex`.
|
|
_.indexOf([1, 2, 1, 2], 2, 2);
|
|
// => 3
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_initialarray"></a>`_.initial(array)`
|
|
<a href="#_initialarray">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6752 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.initial "See the npm package")
|
|
|
|
Gets all but the last element of `array`.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to query.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the slice of `array`.
|
|
|
|
#### Example
|
|
```js
|
|
_.initial([1, 2, 3]);
|
|
// => [1, 2]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_intersectionarrays"></a>`_.intersection([arrays])`
|
|
<a href="#_intersectionarrays">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6773 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.intersection "See the npm package")
|
|
|
|
Creates an array of unique values that are included in all given arrays
|
|
using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
|
|
for equality comparisons. The order of result values is determined by the
|
|
order they occur in the first array.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `[arrays]` *(...Array)*: The arrays to inspect.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of intersecting values.
|
|
|
|
#### Example
|
|
```js
|
|
_.intersection([2, 1], [2, 3]);
|
|
// => [2]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_intersectionbyarrays-iteratee_identity"></a>`_.intersectionBy([arrays], [iteratee=_.identity])`
|
|
<a href="#_intersectionbyarrays-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6803 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.intersectionby "See the npm package")
|
|
|
|
This method is like `_.intersection` except that it accepts `iteratee`
|
|
which is invoked for each element of each `arrays` to generate the criterion
|
|
by which they're compared. Result values are chosen from the first array.
|
|
The iteratee is invoked with one argument: *(value)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[arrays]` *(...Array)*: The arrays to inspect.
|
|
2. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The iteratee invoked per element.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of intersecting values.
|
|
|
|
#### Example
|
|
```js
|
|
_.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor);
|
|
// => [2.1]
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
|
|
// => [{ 'x': 1 }]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_intersectionwitharrays-comparator"></a>`_.intersectionWith([arrays], [comparator])`
|
|
<a href="#_intersectionwitharrays-comparator">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6838 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.intersectionwith "See the npm package")
|
|
|
|
This method is like `_.intersection` except that it accepts `comparator`
|
|
which is invoked to compare elements of `arrays`. Result values are chosen
|
|
from the first array. The comparator is invoked with two arguments:<br>
|
|
*(arrVal, othVal)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[arrays]` *(...Array)*: The arrays to inspect.
|
|
2. `[comparator]` *(Function)*: The comparator invoked per element.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of intersecting values.
|
|
|
|
#### Example
|
|
```js
|
|
var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
|
|
var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
|
|
|
|
_.intersectionWith(objects, others, _.isEqual);
|
|
// => [{ 'x': 1, 'y': 2 }]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_joinarray-separator-"></a>`_.join(array, [separator=','])`
|
|
<a href="#_joinarray-separator-">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6867 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.join "See the npm package")
|
|
|
|
Converts all elements in `array` into a string separated by `separator`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to convert.
|
|
2. `[separator=',']` *(string)*: The element separator.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the joined string.
|
|
|
|
#### Example
|
|
```js
|
|
_.join(['a', 'b', 'c'], '~');
|
|
// => 'a~b~c'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_lastarray"></a>`_.last(array)`
|
|
<a href="#_lastarray">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6885 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.last "See the npm package")
|
|
|
|
Gets the last element of `array`.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to query.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the last element of `array`.
|
|
|
|
#### Example
|
|
```js
|
|
_.last([1, 2, 3]);
|
|
// => 3
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_lastindexofarray-value-fromindexarraylength-1"></a>`_.lastIndexOf(array, value, [fromIndex=array.length-1])`
|
|
<a href="#_lastindexofarray-value-fromindexarraylength-1">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6911 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.lastindexof "See the npm package")
|
|
|
|
This method is like `_.indexOf` except that it iterates over elements of
|
|
`array` from right to left.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to search.
|
|
2. `value` *(*)*: The value to search for.
|
|
3. `[fromIndex=array.length-1]` *(number)*: The index to search from.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the index of the matched value, else `-1`.
|
|
|
|
#### Example
|
|
```js
|
|
_.lastIndexOf([1, 2, 1, 2], 2);
|
|
// => 3
|
|
|
|
// Search from the `fromIndex`.
|
|
_.lastIndexOf([1, 2, 1, 2], 2, 2);
|
|
// => 1
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_ntharray-n0"></a>`_.nth(array, [n=0])`
|
|
<a href="#_ntharray-n0">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6957 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.nth "See the npm package")
|
|
|
|
Gets the element at index `n` of `array`. If `n` is negative, the nth
|
|
element from the end is returned.
|
|
|
|
#### Since
|
|
4.11.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to query.
|
|
2. `[n=0]` *(number)*: The index of the element to return.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the nth element of `array`.
|
|
|
|
#### Example
|
|
```js
|
|
var array = ['a', 'b', 'c', 'd'];
|
|
|
|
_.nth(array, 1);
|
|
// => 'b'
|
|
|
|
_.nth(array, -2);
|
|
// => 'c';
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_pullarray-values"></a>`_.pull(array, [values])`
|
|
<a href="#_pullarray-values">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L6984 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.pull "See the npm package")
|
|
|
|
Removes all given values from `array` using
|
|
[`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
|
|
for equality comparisons.
|
|
<br>
|
|
<br>
|
|
**Note:** Unlike `_.without`, this method mutates `array`. Use `_.remove`
|
|
to remove elements from an array by predicate.
|
|
|
|
#### Since
|
|
2.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to modify.
|
|
2. `[values]` *(...*)*: The values to remove.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns `array`.
|
|
|
|
#### Example
|
|
```js
|
|
var array = ['a', 'b', 'c', 'a', 'b', 'c'];
|
|
|
|
_.pull(array, 'a', 'c');
|
|
console.log(array);
|
|
// => ['b', 'b']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_pullallarray-values"></a>`_.pullAll(array, values)`
|
|
<a href="#_pullallarray-values">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7006 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.pullall "See the npm package")
|
|
|
|
This method is like `_.pull` except that it accepts an array of values to remove.
|
|
<br>
|
|
<br>
|
|
**Note:** Unlike `_.difference`, this method mutates `array`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to modify.
|
|
2. `values` *(Array)*: The values to remove.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns `array`.
|
|
|
|
#### Example
|
|
```js
|
|
var array = ['a', 'b', 'c', 'a', 'b', 'c'];
|
|
|
|
_.pullAll(array, ['a', 'c']);
|
|
console.log(array);
|
|
// => ['b', 'b']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_pullallbyarray-values-iteratee_identity"></a>`_.pullAllBy(array, values, [iteratee=_.identity])`
|
|
<a href="#_pullallbyarray-values-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7036 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.pullallby "See the npm package")
|
|
|
|
This method is like `_.pullAll` except that it accepts `iteratee` which is
|
|
invoked for each element of `array` and `values` to generate the criterion
|
|
by which they're compared. The iteratee is invoked with one argument: *(value)*.
|
|
<br>
|
|
<br>
|
|
**Note:** Unlike `_.differenceBy`, this method mutates `array`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to modify.
|
|
2. `values` *(Array)*: The values to remove.
|
|
3. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The iteratee invoked per element.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns `array`.
|
|
|
|
#### Example
|
|
```js
|
|
var array = [{ 'x': 1 }, { 'x': 2 }, { 'x': 3 }, { 'x': 1 }];
|
|
|
|
_.pullAllBy(array, [{ 'x': 1 }, { 'x': 3 }], 'x');
|
|
console.log(array);
|
|
// => [{ 'x': 2 }]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_pullallwitharray-values-comparator"></a>`_.pullAllWith(array, values, [comparator])`
|
|
<a href="#_pullallwitharray-values-comparator">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7065 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.pullallwith "See the npm package")
|
|
|
|
This method is like `_.pullAll` except that it accepts `comparator` which
|
|
is invoked to compare elements of `array` to `values`. The comparator is
|
|
invoked with two arguments: *(arrVal, othVal)*.
|
|
<br>
|
|
<br>
|
|
**Note:** Unlike `_.differenceWith`, this method mutates `array`.
|
|
|
|
#### Since
|
|
4.6.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to modify.
|
|
2. `values` *(Array)*: The values to remove.
|
|
3. `[comparator]` *(Function)*: The comparator invoked per element.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns `array`.
|
|
|
|
#### Example
|
|
```js
|
|
var array = [{ 'x': 1, 'y': 2 }, { 'x': 3, 'y': 4 }, { 'x': 5, 'y': 6 }];
|
|
|
|
_.pullAllWith(array, [{ 'x': 3, 'y': 4 }], _.isEqual);
|
|
console.log(array);
|
|
// => [{ 'x': 1, 'y': 2 }, { 'x': 5, 'y': 6 }]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_pullatarray-indexes"></a>`_.pullAt(array, [indexes])`
|
|
<a href="#_pullatarray-indexes">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7095 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.pullat "See the npm package")
|
|
|
|
Removes elements from `array` corresponding to `indexes` and returns an
|
|
array of removed elements.
|
|
<br>
|
|
<br>
|
|
**Note:** Unlike `_.at`, this method mutates `array`.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to modify.
|
|
2. `[indexes]` *(...(number|number[]))*: The indexes of elements to remove.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of removed elements.
|
|
|
|
#### Example
|
|
```js
|
|
var array = ['a', 'b', 'c', 'd'];
|
|
var pulled = _.pullAt(array, [1, 3]);
|
|
|
|
console.log(array);
|
|
// => ['a', 'c']
|
|
|
|
console.log(pulled);
|
|
// => ['b', 'd']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_removearray-predicate_identity"></a>`_.remove(array, [predicate=_.identity])`
|
|
<a href="#_removearray-predicate_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7137 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.remove "See the npm package")
|
|
|
|
Removes all elements from `array` that `predicate` returns truthy for
|
|
and returns an array of the removed elements. The predicate is invoked
|
|
with three arguments: *(value, index, array)*.
|
|
<br>
|
|
<br>
|
|
**Note:** Unlike `_.filter`, this method mutates `array`. Use `_.pull`
|
|
to pull elements from an array by value.
|
|
|
|
#### Since
|
|
2.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to modify.
|
|
2. `[predicate=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of removed elements.
|
|
|
|
#### Example
|
|
```js
|
|
var array = [1, 2, 3, 4];
|
|
var evens = _.remove(array, function(n) {
|
|
return n % 2 == 0;
|
|
});
|
|
|
|
console.log(array);
|
|
// => [1, 3]
|
|
|
|
console.log(evens);
|
|
// => [2, 4]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_reversearray"></a>`_.reverse(array)`
|
|
<a href="#_reversearray">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7181 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.reverse "See the npm package")
|
|
|
|
Reverses `array` so that the first element becomes the last, the second
|
|
element becomes the second to last, and so on.
|
|
<br>
|
|
<br>
|
|
**Note:** This method mutates `array` and is based on
|
|
[`Array#reverse`](https://mdn.io/Array/reverse).
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to modify.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns `array`.
|
|
|
|
#### Example
|
|
```js
|
|
var array = [1, 2, 3];
|
|
|
|
_.reverse(array);
|
|
// => [3, 2, 1]
|
|
|
|
console.log(array);
|
|
// => [3, 2, 1]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_slicearray-start0-endarraylength"></a>`_.slice(array, [start=0], [end=array.length])`
|
|
<a href="#_slicearray-start0-endarraylength">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7201 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.slice "See the npm package")
|
|
|
|
Creates a slice of `array` from `start` up to, but not including, `end`.
|
|
<br>
|
|
<br>
|
|
**Note:** This method is used instead of
|
|
[`Array#slice`](https://mdn.io/Array/slice) to ensure dense arrays are
|
|
returned.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to slice.
|
|
2. `[start=0]` *(number)*: The start position.
|
|
3. `[end=array.length]` *(number)*: The end position.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the slice of `array`.
|
|
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_sortedindexarray-value"></a>`_.sortedIndex(array, value)`
|
|
<a href="#_sortedindexarray-value">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7234 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.sortedindex "See the npm package")
|
|
|
|
Uses a binary search to determine the lowest index at which `value`
|
|
should be inserted into `array` in order to maintain its sort order.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The sorted array to inspect.
|
|
2. `value` *(*)*: The value to evaluate.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the index at which `value` should be inserted into `array`.
|
|
|
|
#### Example
|
|
```js
|
|
_.sortedIndex([30, 50], 40);
|
|
// => 1
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_sortedindexbyarray-value-iteratee_identity"></a>`_.sortedIndexBy(array, value, [iteratee=_.identity])`
|
|
<a href="#_sortedindexbyarray-value-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7264 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.sortedindexby "See the npm package")
|
|
|
|
This method is like `_.sortedIndex` except that it accepts `iteratee`
|
|
which is invoked for `value` and each element of `array` to compute their
|
|
sort ranking. The iteratee is invoked with one argument: *(value)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The sorted array to inspect.
|
|
2. `value` *(*)*: The value to evaluate.
|
|
3. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The iteratee invoked per element.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the index at which `value` should be inserted into `array`.
|
|
|
|
#### Example
|
|
```js
|
|
var objects = [{ 'x': 4 }, { 'x': 5 }];
|
|
|
|
_.sortedIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
|
|
// => 0
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.sortedIndexBy(objects, { 'x': 4 }, 'x');
|
|
// => 0
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_sortedindexofarray-value"></a>`_.sortedIndexOf(array, value)`
|
|
<a href="#_sortedindexofarray-value">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7284 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.sortedindexof "See the npm package")
|
|
|
|
This method is like `_.indexOf` except that it performs a binary
|
|
search on a sorted `array`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to search.
|
|
2. `value` *(*)*: The value to search for.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the index of the matched value, else `-1`.
|
|
|
|
#### Example
|
|
```js
|
|
_.sortedIndexOf([4, 5, 5, 5, 6], 5);
|
|
// => 1
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_sortedlastindexarray-value"></a>`_.sortedLastIndex(array, value)`
|
|
<a href="#_sortedlastindexarray-value">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7313 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.sortedlastindex "See the npm package")
|
|
|
|
This method is like `_.sortedIndex` except that it returns the highest
|
|
index at which `value` should be inserted into `array` in order to
|
|
maintain its sort order.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The sorted array to inspect.
|
|
2. `value` *(*)*: The value to evaluate.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the index at which `value` should be inserted into `array`.
|
|
|
|
#### Example
|
|
```js
|
|
_.sortedLastIndex([4, 5, 5, 5, 6], 5);
|
|
// => 4
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_sortedlastindexbyarray-value-iteratee_identity"></a>`_.sortedLastIndexBy(array, value, [iteratee=_.identity])`
|
|
<a href="#_sortedlastindexbyarray-value-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7343 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.sortedlastindexby "See the npm package")
|
|
|
|
This method is like `_.sortedLastIndex` except that it accepts `iteratee`
|
|
which is invoked for `value` and each element of `array` to compute their
|
|
sort ranking. The iteratee is invoked with one argument: *(value)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The sorted array to inspect.
|
|
2. `value` *(*)*: The value to evaluate.
|
|
3. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The iteratee invoked per element.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the index at which `value` should be inserted into `array`.
|
|
|
|
#### Example
|
|
```js
|
|
var objects = [{ 'x': 4 }, { 'x': 5 }];
|
|
|
|
_.sortedLastIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
|
|
// => 1
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.sortedLastIndexBy(objects, { 'x': 4 }, 'x');
|
|
// => 1
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_sortedlastindexofarray-value"></a>`_.sortedLastIndexOf(array, value)`
|
|
<a href="#_sortedlastindexofarray-value">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7363 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.sortedlastindexof "See the npm package")
|
|
|
|
This method is like `_.lastIndexOf` except that it performs a binary
|
|
search on a sorted `array`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to search.
|
|
2. `value` *(*)*: The value to search for.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the index of the matched value, else `-1`.
|
|
|
|
#### Example
|
|
```js
|
|
_.sortedLastIndexOf([4, 5, 5, 5, 6], 5);
|
|
// => 3
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_sorteduniqarray"></a>`_.sortedUniq(array)`
|
|
<a href="#_sorteduniqarray">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7389 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.sorteduniq "See the npm package")
|
|
|
|
This method is like `_.uniq` except that it's designed and optimized
|
|
for sorted arrays.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to inspect.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new duplicate free array.
|
|
|
|
#### Example
|
|
```js
|
|
_.sortedUniq([1, 1, 2]);
|
|
// => [1, 2]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_sorteduniqbyarray-iteratee"></a>`_.sortedUniqBy(array, [iteratee])`
|
|
<a href="#_sorteduniqbyarray-iteratee">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7411 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.sorteduniqby "See the npm package")
|
|
|
|
This method is like `_.uniqBy` except that it's designed and optimized
|
|
for sorted arrays.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to inspect.
|
|
2. `[iteratee]` *(Function)*: The iteratee invoked per element.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new duplicate free array.
|
|
|
|
#### Example
|
|
```js
|
|
_.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor);
|
|
// => [1.1, 2.3]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_tailarray"></a>`_.tail(array)`
|
|
<a href="#_tailarray">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7431 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.tail "See the npm package")
|
|
|
|
Gets all but the first element of `array`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to query.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the slice of `array`.
|
|
|
|
#### Example
|
|
```js
|
|
_.tail([1, 2, 3]);
|
|
// => [2, 3]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_takearray-n1"></a>`_.take(array, [n=1])`
|
|
<a href="#_takearray-n1">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7460 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.take "See the npm package")
|
|
|
|
Creates a slice of `array` with `n` elements taken from the beginning.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to query.
|
|
2. `[n=1]` *(number)*: The number of elements to take.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the slice of `array`.
|
|
|
|
#### Example
|
|
```js
|
|
_.take([1, 2, 3]);
|
|
// => [1]
|
|
|
|
_.take([1, 2, 3], 2);
|
|
// => [1, 2]
|
|
|
|
_.take([1, 2, 3], 5);
|
|
// => [1, 2, 3]
|
|
|
|
_.take([1, 2, 3], 0);
|
|
// => []
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_takerightarray-n1"></a>`_.takeRight(array, [n=1])`
|
|
<a href="#_takerightarray-n1">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7493 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.takeright "See the npm package")
|
|
|
|
Creates a slice of `array` with `n` elements taken from the end.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to query.
|
|
2. `[n=1]` *(number)*: The number of elements to take.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the slice of `array`.
|
|
|
|
#### Example
|
|
```js
|
|
_.takeRight([1, 2, 3]);
|
|
// => [3]
|
|
|
|
_.takeRight([1, 2, 3], 2);
|
|
// => [2, 3]
|
|
|
|
_.takeRight([1, 2, 3], 5);
|
|
// => [1, 2, 3]
|
|
|
|
_.takeRight([1, 2, 3], 0);
|
|
// => []
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_takerightwhilearray-predicate_identity"></a>`_.takeRightWhile(array, [predicate=_.identity])`
|
|
<a href="#_takerightwhilearray-predicate_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7539 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.takerightwhile "See the npm package")
|
|
|
|
Creates a slice of `array` with elements taken from the end. Elements are
|
|
taken until `predicate` returns falsey. The predicate is invoked with
|
|
three arguments: *(value, index, array)*.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to query.
|
|
2. `[predicate=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the slice of `array`.
|
|
|
|
#### Example
|
|
```js
|
|
var users = [
|
|
{ 'user': 'barney', 'active': true },
|
|
{ 'user': 'fred', 'active': false },
|
|
{ 'user': 'pebbles', 'active': false }
|
|
];
|
|
|
|
_.takeRightWhile(users, function(o) { return !o.active; });
|
|
// => objects for ['fred', 'pebbles']
|
|
|
|
// The `_.matches` iteratee shorthand.
|
|
_.takeRightWhile(users, { 'user': 'pebbles', 'active': false });
|
|
// => objects for ['pebbles']
|
|
|
|
// The `_.matchesProperty` iteratee shorthand.
|
|
_.takeRightWhile(users, ['active', false]);
|
|
// => objects for ['fred', 'pebbles']
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.takeRightWhile(users, 'active');
|
|
// => []
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_takewhilearray-predicate_identity"></a>`_.takeWhile(array, [predicate=_.identity])`
|
|
<a href="#_takewhilearray-predicate_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7581 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.takewhile "See the npm package")
|
|
|
|
Creates a slice of `array` with elements taken from the beginning. Elements
|
|
are taken until `predicate` returns falsey. The predicate is invoked with
|
|
three arguments: *(value, index, array)*.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to query.
|
|
2. `[predicate=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the slice of `array`.
|
|
|
|
#### Example
|
|
```js
|
|
var users = [
|
|
{ 'user': 'barney', 'active': false },
|
|
{ 'user': 'fred', 'active': false},
|
|
{ 'user': 'pebbles', 'active': true }
|
|
];
|
|
|
|
_.takeWhile(users, function(o) { return !o.active; });
|
|
// => objects for ['barney', 'fred']
|
|
|
|
// The `_.matches` iteratee shorthand.
|
|
_.takeWhile(users, { 'user': 'barney', 'active': false });
|
|
// => objects for ['barney']
|
|
|
|
// The `_.matchesProperty` iteratee shorthand.
|
|
_.takeWhile(users, ['active', false]);
|
|
// => objects for ['barney', 'fred']
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.takeWhile(users, 'active');
|
|
// => []
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_unionarrays"></a>`_.union([arrays])`
|
|
<a href="#_unionarrays">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7603 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.union "See the npm package")
|
|
|
|
Creates an array of unique values, in order, from all given arrays using
|
|
[`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
|
|
for equality comparisons.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `[arrays]` *(...Array)*: The arrays to inspect.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of combined values.
|
|
|
|
#### Example
|
|
```js
|
|
_.union([2], [1, 2]);
|
|
// => [2, 1]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_unionbyarrays-iteratee_identity"></a>`_.unionBy([arrays], [iteratee=_.identity])`
|
|
<a href="#_unionbyarrays-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7630 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.unionby "See the npm package")
|
|
|
|
This method is like `_.union` except that it accepts `iteratee` which is
|
|
invoked for each element of each `arrays` to generate the criterion by
|
|
which uniqueness is computed. The iteratee is invoked with one argument:<br>
|
|
*(value)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[arrays]` *(...Array)*: The arrays to inspect.
|
|
2. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The iteratee invoked per element.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of combined values.
|
|
|
|
#### Example
|
|
```js
|
|
_.unionBy([2.1], [1.2, 2.3], Math.floor);
|
|
// => [2.1, 1.2]
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
|
|
// => [{ 'x': 1 }, { 'x': 2 }]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_unionwitharrays-comparator"></a>`_.unionWith([arrays], [comparator])`
|
|
<a href="#_unionwitharrays-comparator">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7658 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.unionwith "See the npm package")
|
|
|
|
This method is like `_.union` except that it accepts `comparator` which
|
|
is invoked to compare elements of `arrays`. The comparator is invoked
|
|
with two arguments: *(arrVal, othVal)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[arrays]` *(...Array)*: The arrays to inspect.
|
|
2. `[comparator]` *(Function)*: The comparator invoked per element.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of combined values.
|
|
|
|
#### Example
|
|
```js
|
|
var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
|
|
var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
|
|
|
|
_.unionWith(objects, others, _.isEqual);
|
|
// => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_uniqarray"></a>`_.uniq(array)`
|
|
<a href="#_uniqarray">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7683 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.uniq "See the npm package")
|
|
|
|
Creates a duplicate-free version of an array, using
|
|
[`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
|
|
for equality comparisons, in which only the first occurrence of each
|
|
element is kept.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to inspect.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new duplicate free array.
|
|
|
|
#### Example
|
|
```js
|
|
_.uniq([2, 1, 2]);
|
|
// => [2, 1]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_uniqbyarray-iteratee_identity"></a>`_.uniqBy(array, [iteratee=_.identity])`
|
|
<a href="#_uniqbyarray-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7711 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.uniqby "See the npm package")
|
|
|
|
This method is like `_.uniq` except that it accepts `iteratee` which is
|
|
invoked for each element in `array` to generate the criterion by which
|
|
uniqueness is computed. The iteratee is invoked with one argument: *(value)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to inspect.
|
|
2. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The iteratee invoked per element.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new duplicate free array.
|
|
|
|
#### Example
|
|
```js
|
|
_.uniqBy([2.1, 1.2, 2.3], Math.floor);
|
|
// => [2.1, 1.2]
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
|
|
// => [{ 'x': 1 }, { 'x': 2 }]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_uniqwitharray-comparator"></a>`_.uniqWith(array, [comparator])`
|
|
<a href="#_uniqwitharray-comparator">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7736 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.uniqwith "See the npm package")
|
|
|
|
This method is like `_.uniq` except that it accepts `comparator` which
|
|
is invoked to compare elements of `array`. The comparator is invoked with
|
|
two arguments: *(arrVal, othVal)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to inspect.
|
|
2. `[comparator]` *(Function)*: The comparator invoked per element.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new duplicate free array.
|
|
|
|
#### Example
|
|
```js
|
|
var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 2 }];
|
|
|
|
_.uniqWith(objects, _.isEqual);
|
|
// => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_unziparray"></a>`_.unzip(array)`
|
|
<a href="#_unziparray">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7761 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.unzip "See the npm package")
|
|
|
|
This method is like `_.zip` except that it accepts an array of grouped
|
|
elements and creates an array regrouping the elements to their pre-zip
|
|
configuration.
|
|
|
|
#### Since
|
|
1.2.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array of grouped elements to process.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of regrouped elements.
|
|
|
|
#### Example
|
|
```js
|
|
var zipped = _.zip(['fred', 'barney'], [30, 40], [true, false]);
|
|
// => [['fred', 30, true], ['barney', 40, false]]
|
|
|
|
_.unzip(zipped);
|
|
// => [['fred', 'barney'], [30, 40], [true, false]]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_unzipwitharray-iteratee_identity"></a>`_.unzipWith(array, [iteratee=_.identity])`
|
|
<a href="#_unzipwitharray-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7798 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.unzipwith "See the npm package")
|
|
|
|
This method is like `_.unzip` except that it accepts `iteratee` to specify
|
|
how regrouped values should be combined. The iteratee is invoked with the
|
|
elements of each group: *(...group)*.
|
|
|
|
#### Since
|
|
3.8.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array of grouped elements to process.
|
|
2. `[iteratee=_.identity]` *(Function)*: The function to combine regrouped values.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of regrouped elements.
|
|
|
|
#### Example
|
|
```js
|
|
var zipped = _.zip([1, 2], [10, 20], [100, 200]);
|
|
// => [[1, 10, 100], [2, 20, 200]]
|
|
|
|
_.unzipWith(zipped, _.add);
|
|
// => [3, 30, 300]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_withoutarray-values"></a>`_.without(array, [values])`
|
|
<a href="#_withoutarray-values">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7829 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.without "See the npm package")
|
|
|
|
Creates an array excluding all given values using
|
|
[`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
|
|
for equality comparisons.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to inspect.
|
|
2. `[values]` *(...*)*: The values to exclude.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of filtered values.
|
|
|
|
#### Example
|
|
```js
|
|
_.without([2, 1, 2, 3], 1, 2);
|
|
// => [3]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_xorarrays"></a>`_.xor([arrays])`
|
|
<a href="#_xorarrays">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7853 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.xor "See the npm package")
|
|
|
|
Creates an array of unique values that is the
|
|
[symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
|
|
of the given arrays. The order of result values is determined by the order
|
|
they occur in the arrays.
|
|
|
|
#### Since
|
|
2.4.0
|
|
#### Arguments
|
|
1. `[arrays]` *(...Array)*: The arrays to inspect.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of filtered values.
|
|
|
|
#### Example
|
|
```js
|
|
_.xor([2, 1], [2, 3]);
|
|
// => [1, 3]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_xorbyarrays-iteratee_identity"></a>`_.xorBy([arrays], [iteratee=_.identity])`
|
|
<a href="#_xorbyarrays-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7880 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.xorby "See the npm package")
|
|
|
|
This method is like `_.xor` except that it accepts `iteratee` which is
|
|
invoked for each element of each `arrays` to generate the criterion by
|
|
which by which they're compared. The iteratee is invoked with one argument:<br>
|
|
*(value)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[arrays]` *(...Array)*: The arrays to inspect.
|
|
2. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The iteratee invoked per element.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of filtered values.
|
|
|
|
#### Example
|
|
```js
|
|
_.xorBy([2.1, 1.2], [2.3, 3.4], Math.floor);
|
|
// => [1.2, 3.4]
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
|
|
// => [{ 'x': 2 }]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_xorwitharrays-comparator"></a>`_.xorWith([arrays], [comparator])`
|
|
<a href="#_xorwitharrays-comparator">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7908 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.xorwith "See the npm package")
|
|
|
|
This method is like `_.xor` except that it accepts `comparator` which is
|
|
invoked to compare elements of `arrays`. The comparator is invoked with
|
|
two arguments: *(arrVal, othVal)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[arrays]` *(...Array)*: The arrays to inspect.
|
|
2. `[comparator]` *(Function)*: The comparator invoked per element.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of filtered values.
|
|
|
|
#### Example
|
|
```js
|
|
var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
|
|
var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
|
|
|
|
_.xorWith(objects, others, _.isEqual);
|
|
// => [{ 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_ziparrays"></a>`_.zip([arrays])`
|
|
<a href="#_ziparrays">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7932 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.zip "See the npm package")
|
|
|
|
Creates an array of grouped elements, the first of which contains the
|
|
first elements of the given arrays, the second of which contains the
|
|
second elements of the given arrays, and so on.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `[arrays]` *(...Array)*: The arrays to process.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of grouped elements.
|
|
|
|
#### Example
|
|
```js
|
|
_.zip(['fred', 'barney'], [30, 40], [true, false]);
|
|
// => [['fred', 30, true], ['barney', 40, false]]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_zipobjectprops-values"></a>`_.zipObject([props=[]], [values=[]])`
|
|
<a href="#_zipobjectprops-values">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7950 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.zipobject "See the npm package")
|
|
|
|
This method is like `_.fromPairs` except that it accepts two arrays,
|
|
one of property identifiers and one of corresponding values.
|
|
|
|
#### Since
|
|
0.4.0
|
|
#### Arguments
|
|
1. `[props=[]]` *(Array)*: The property identifiers.
|
|
2. `[values=[]]` *(Array)*: The property values.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the new object.
|
|
|
|
#### Example
|
|
```js
|
|
_.zipObject(['a', 'b'], [1, 2]);
|
|
// => { 'a': 1, 'b': 2 }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_zipobjectdeepprops-values"></a>`_.zipObjectDeep([props=[]], [values=[]])`
|
|
<a href="#_zipobjectdeepprops-values">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7969 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.zipobjectdeep "See the npm package")
|
|
|
|
This method is like `_.zipObject` except that it supports property paths.
|
|
|
|
#### Since
|
|
4.1.0
|
|
#### Arguments
|
|
1. `[props=[]]` *(Array)*: The property identifiers.
|
|
2. `[values=[]]` *(Array)*: The property values.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the new object.
|
|
|
|
#### Example
|
|
```js
|
|
_.zipObjectDeep(['a.b[0].c', 'a.b[1].d'], [1, 2]);
|
|
// => { 'a': { 'b': [{ 'c': 1 }, { 'd': 2 }] } }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_zipwitharrays-iteratee_identity"></a>`_.zipWith([arrays], [iteratee=_.identity])`
|
|
<a href="#_zipwitharrays-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L7992 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.zipwith "See the npm package")
|
|
|
|
This method is like `_.zip` except that it accepts `iteratee` to specify
|
|
how grouped values should be combined. The iteratee is invoked with the
|
|
elements of each group: *(...group)*.
|
|
|
|
#### Since
|
|
3.8.0
|
|
#### Arguments
|
|
1. `[arrays]` *(...Array)*: The arrays to process.
|
|
2. `[iteratee=_.identity]` *(Function)*: The function to combine grouped values.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new array of grouped elements.
|
|
|
|
#### Example
|
|
```js
|
|
_.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) {
|
|
return a + b + c;
|
|
});
|
|
// => [111, 222]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
## `“Collection” Methods`
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_countbycollection-iteratee_identity"></a>`_.countBy(collection, [iteratee=_.identity])`
|
|
<a href="#_countbycollection-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8373 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.countby "See the npm package")
|
|
|
|
Creates an object composed of keys generated from the results of running
|
|
each element of `collection` thru `iteratee`. The corresponding value of
|
|
each key is the number of times the key was returned by `iteratee`. The
|
|
iteratee is invoked with one argument: *(value)*.
|
|
|
|
#### Since
|
|
0.5.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The iteratee to transform keys.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the composed aggregate object.
|
|
|
|
#### Example
|
|
```js
|
|
_.countBy([6.1, 4.2, 6.3], Math.floor);
|
|
// => { '4': 1, '6': 2 }
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.countBy(['one', 'two', 'three'], 'length');
|
|
// => { '3': 2, '5': 1 }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_everycollection-predicate_identity"></a>`_.every(collection, [predicate=_.identity])`
|
|
<a href="#_everycollection-predicate_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8414 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.every "See the npm package")
|
|
|
|
Checks if `predicate` returns truthy for **all** elements of `collection`.
|
|
Iteration is stopped once `predicate` returns falsey. The predicate is
|
|
invoked with three arguments: *(value, index|key, collection)*.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `[predicate=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if all elements pass the predicate check, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.every([true, 1, null, 'yes'], Boolean);
|
|
// => false
|
|
|
|
var users = [
|
|
{ 'user': 'barney', 'age': 36, 'active': false },
|
|
{ 'user': 'fred', 'age': 40, 'active': false }
|
|
];
|
|
|
|
// The `_.matches` iteratee shorthand.
|
|
_.every(users, { 'user': 'barney', 'active': false });
|
|
// => false
|
|
|
|
// The `_.matchesProperty` iteratee shorthand.
|
|
_.every(users, ['active', false]);
|
|
// => true
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.every(users, 'active');
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_filtercollection-predicate_identity"></a>`_.filter(collection, [predicate=_.identity])`
|
|
<a href="#_filtercollection-predicate_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8458 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.filter "See the npm package")
|
|
|
|
Iterates over elements of `collection`, returning an array of all elements
|
|
`predicate` returns truthy for. The predicate is invoked with three
|
|
arguments: *(value, index|key, collection)*.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `[predicate=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new filtered array.
|
|
|
|
#### Example
|
|
```js
|
|
var users = [
|
|
{ 'user': 'barney', 'age': 36, 'active': true },
|
|
{ 'user': 'fred', 'age': 40, 'active': false }
|
|
];
|
|
|
|
_.filter(users, function(o) { return !o.active; });
|
|
// => objects for ['fred']
|
|
|
|
// The `_.matches` iteratee shorthand.
|
|
_.filter(users, { 'age': 36, 'active': true });
|
|
// => objects for ['barney']
|
|
|
|
// The `_.matchesProperty` iteratee shorthand.
|
|
_.filter(users, ['active', false]);
|
|
// => objects for ['fred']
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.filter(users, 'active');
|
|
// => objects for ['barney']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_findcollection-predicate_identity-fromindex0"></a>`_.find(collection, [predicate=_.identity], [fromIndex=0])`
|
|
<a href="#_findcollection-predicate_identity-fromindex0">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8500 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.find "See the npm package")
|
|
|
|
Iterates over elements of `collection`, returning the first element
|
|
`predicate` returns truthy for. The predicate is invoked with three
|
|
arguments: *(value, index|key, collection)*.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to search.
|
|
2. `[predicate=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
3. `[fromIndex=0]` *(number)*: The index to search from.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the matched element, else `undefined`.
|
|
|
|
#### Example
|
|
```js
|
|
var users = [
|
|
{ 'user': 'barney', 'age': 36, 'active': true },
|
|
{ 'user': 'fred', 'age': 40, 'active': false },
|
|
{ 'user': 'pebbles', 'age': 1, 'active': true }
|
|
];
|
|
|
|
_.find(users, function(o) { return o.age < 40; });
|
|
// => object for 'barney'
|
|
|
|
// The `_.matches` iteratee shorthand.
|
|
_.find(users, { 'age': 1, 'active': true });
|
|
// => object for 'pebbles'
|
|
|
|
// The `_.matchesProperty` iteratee shorthand.
|
|
_.find(users, ['active', false]);
|
|
// => object for 'fred'
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.find(users, 'active');
|
|
// => object for 'barney'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_findlastcollection-predicate_identity-fromindexcollectionlength-1"></a>`_.findLast(collection, [predicate=_.identity], [fromIndex=collection.length-1])`
|
|
<a href="#_findlastcollection-predicate_identity-fromindexcollectionlength-1">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8522 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.findlast "See the npm package")
|
|
|
|
This method is like `_.find` except that it iterates over elements of
|
|
`collection` from right to left.
|
|
|
|
#### Since
|
|
2.0.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to search.
|
|
2. `[predicate=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
3. `[fromIndex=collection.length-1]` *(number)*: The index to search from.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the matched element, else `undefined`.
|
|
|
|
#### Example
|
|
```js
|
|
_.findLast([1, 2, 3, 4], function(n) {
|
|
return n % 2 == 1;
|
|
});
|
|
// => 3
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_flatmapcollection-iteratee_identity"></a>`_.flatMap(collection, [iteratee=_.identity])`
|
|
<a href="#_flatmapcollection-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8546 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.flatmap "See the npm package")
|
|
|
|
Creates a flattened array of values by running each element in `collection`
|
|
thru `iteratee` and flattening the mapped results. The iteratee is invoked
|
|
with three arguments: *(value, index|key, collection)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new flattened array.
|
|
|
|
#### Example
|
|
```js
|
|
function duplicate(n) {
|
|
return [n, n];
|
|
}
|
|
|
|
_.flatMap([1, 2], duplicate);
|
|
// => [1, 1, 2, 2]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_flatmapdeepcollection-iteratee_identity"></a>`_.flatMapDeep(collection, [iteratee=_.identity])`
|
|
<a href="#_flatmapdeepcollection-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8571 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.flatmapdeep "See the npm package")
|
|
|
|
This method is like `_.flatMap` except that it recursively flattens the
|
|
mapped results.
|
|
|
|
#### Since
|
|
4.7.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new flattened array.
|
|
|
|
#### Example
|
|
```js
|
|
function duplicate(n) {
|
|
return [[[n, n]]];
|
|
}
|
|
|
|
_.flatMapDeep([1, 2], duplicate);
|
|
// => [1, 1, 2, 2]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_flatmapdepthcollection-iteratee_identity-depth1"></a>`_.flatMapDepth(collection, [iteratee=_.identity], [depth=1])`
|
|
<a href="#_flatmapdepthcollection-iteratee_identity-depth1">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8597 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.flatmapdepth "See the npm package")
|
|
|
|
This method is like `_.flatMap` except that it recursively flattens the
|
|
mapped results up to `depth` times.
|
|
|
|
#### Since
|
|
4.7.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
3. `[depth=1]` *(number)*: The maximum recursion depth.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new flattened array.
|
|
|
|
#### Example
|
|
```js
|
|
function duplicate(n) {
|
|
return [[[n, n]]];
|
|
}
|
|
|
|
_.flatMapDepth([1, 2], duplicate, 2);
|
|
// => [[1, 1], [2, 2]]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_foreachcollection-iteratee_identity"></a>`_.forEach(collection, [iteratee=_.identity])`
|
|
<a href="#_foreachcollection-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8632 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.foreach "See the npm package")
|
|
|
|
Iterates over elements of `collection` and invokes `iteratee` for each element.
|
|
The iteratee is invoked with three arguments: *(value, index|key, collection)*.
|
|
Iteratee functions may exit iteration early by explicitly returning `false`.
|
|
<br>
|
|
<br>
|
|
**Note:** As with other "Collections" methods, objects with a "length"
|
|
property are iterated like arrays. To avoid this behavior use `_.forIn`
|
|
or `_.forOwn` for object iteration.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Aliases
|
|
*_.each*
|
|
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(*)*: Returns `collection`.
|
|
|
|
#### Example
|
|
```js
|
|
_([1, 2]).forEach(function(value) {
|
|
console.log(value);
|
|
});
|
|
// => Logs `1` then `2`.
|
|
|
|
_.forEach({ 'a': 1, 'b': 2 }, function(value, key) {
|
|
console.log(key);
|
|
});
|
|
// => Logs 'a' then 'b' (iteration order is not guaranteed).
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_foreachrightcollection-iteratee_identity"></a>`_.forEachRight(collection, [iteratee=_.identity])`
|
|
<a href="#_foreachrightcollection-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8657 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.foreachright "See the npm package")
|
|
|
|
This method is like `_.forEach` except that it iterates over elements of
|
|
`collection` from right to left.
|
|
|
|
#### Since
|
|
2.0.0
|
|
#### Aliases
|
|
*_.eachRight*
|
|
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(*)*: Returns `collection`.
|
|
|
|
#### Example
|
|
```js
|
|
_.forEachRight([1, 2], function(value) {
|
|
console.log(value);
|
|
});
|
|
// => Logs `2` then `1`.
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_groupbycollection-iteratee_identity"></a>`_.groupBy(collection, [iteratee=_.identity])`
|
|
<a href="#_groupbycollection-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8686 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.groupby "See the npm package")
|
|
|
|
Creates an object composed of keys generated from the results of running
|
|
each element of `collection` thru `iteratee`. The order of grouped values
|
|
is determined by the order they occur in `collection`. The corresponding
|
|
value of each key is an array of elements responsible for generating the
|
|
key. The iteratee is invoked with one argument: *(value)*.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The iteratee to transform keys.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the composed aggregate object.
|
|
|
|
#### Example
|
|
```js
|
|
_.groupBy([6.1, 4.2, 6.3], Math.floor);
|
|
// => { '4': [4.2], '6': [6.1, 6.3] }
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.groupBy(['one', 'two', 'three'], 'length');
|
|
// => { '3': ['one', 'two'], '5': ['three'] }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_includescollection-value-fromindex0"></a>`_.includes(collection, value, [fromIndex=0])`
|
|
<a href="#_includescollection-value-fromindex0">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8724 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.includes "See the npm package")
|
|
|
|
Checks if `value` is in `collection`. If `collection` is a string, it's
|
|
checked for a substring of `value`, otherwise
|
|
[`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
|
|
is used for equality comparisons. If `fromIndex` is negative, it's used as
|
|
the offset from the end of `collection`.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object|string)*: The collection to search.
|
|
2. `value` *(*)*: The value to search for.
|
|
3. `[fromIndex=0]` *(number)*: The index to search from.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is found, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.includes([1, 2, 3], 1);
|
|
// => true
|
|
|
|
_.includes([1, 2, 3], 1, 2);
|
|
// => false
|
|
|
|
_.includes({ 'user': 'fred', 'age': 40 }, 'fred');
|
|
// => true
|
|
|
|
_.includes('pebbles', 'eb');
|
|
// => true
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_invokemapcollection-path-args"></a>`_.invokeMap(collection, path, [args])`
|
|
<a href="#_invokemapcollection-path-args">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8760 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.invokemap "See the npm package")
|
|
|
|
Invokes the method at `path` of each element in `collection`, returning
|
|
an array of the results of each invoked method. Any additional arguments
|
|
are provided to each invoked method. If `methodName` is a function, it's
|
|
invoked for and `this` bound to, each element in `collection`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `path` *(Array|Function|string)*: The path of the method to invoke or the function invoked per iteration.
|
|
3. `[args]` *(...*)*: The arguments to invoke each method with.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the array of results.
|
|
|
|
#### Example
|
|
```js
|
|
_.invokeMap([[5, 1, 7], [3, 2, 1]], 'sort');
|
|
// => [[1, 5, 7], [1, 2, 3]]
|
|
|
|
_.invokeMap([123, 456], String.prototype.split, '');
|
|
// => [['1', '2', '3'], ['4', '5', '6']]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_keybycollection-iteratee_identity"></a>`_.keyBy(collection, [iteratee=_.identity])`
|
|
<a href="#_keybycollection-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8802 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.keyby "See the npm package")
|
|
|
|
Creates an object composed of keys generated from the results of running
|
|
each element of `collection` thru `iteratee`. The corresponding value of
|
|
each key is the last element responsible for generating the key. The
|
|
iteratee is invoked with one argument: *(value)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The iteratee to transform keys.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the composed aggregate object.
|
|
|
|
#### Example
|
|
```js
|
|
var array = [
|
|
{ 'dir': 'left', 'code': 97 },
|
|
{ 'dir': 'right', 'code': 100 }
|
|
];
|
|
|
|
_.keyBy(array, function(o) {
|
|
return String.fromCharCode(o.code);
|
|
});
|
|
// => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
|
|
|
|
_.keyBy(array, 'dir');
|
|
// => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_mapcollection-iteratee_identity"></a>`_.map(collection, [iteratee=_.identity])`
|
|
<a href="#_mapcollection-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8849 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.map "See the npm package")
|
|
|
|
Creates an array of values by running each element in `collection` thru
|
|
`iteratee`. The iteratee is invoked with three arguments:<br>
|
|
*(value, index|key, collection)*.
|
|
<br>
|
|
<br>
|
|
Many lodash methods are guarded to work as iteratees for methods like
|
|
`_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.
|
|
<br>
|
|
<br>
|
|
The guarded methods are:<br>
|
|
`ary`, `chunk`, `curry`, `curryRight`, `drop`, `dropRight`, `every`,
|
|
`fill`, `invert`, `parseInt`, `random`, `range`, `rangeRight`, `repeat`,
|
|
`sampleSize`, `slice`, `some`, `sortBy`, `split`, `take`, `takeRight`,
|
|
`template`, `trim`, `trimEnd`, `trimStart`, and `words`
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new mapped array.
|
|
|
|
#### Example
|
|
```js
|
|
function square(n) {
|
|
return n * n;
|
|
}
|
|
|
|
_.map([4, 8], square);
|
|
// => [16, 64]
|
|
|
|
_.map({ 'a': 4, 'b': 8 }, square);
|
|
// => [16, 64] (iteration order is not guaranteed)
|
|
|
|
var users = [
|
|
{ 'user': 'barney' },
|
|
{ 'user': 'fred' }
|
|
];
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.map(users, 'user');
|
|
// => ['barney', 'fred']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_orderbycollection-iteratees_identity-orders"></a>`_.orderBy(collection, [iteratees=[_.identity]], [orders])`
|
|
<a href="#_orderbycollection-iteratees_identity-orders">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8883 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.orderby "See the npm package")
|
|
|
|
This method is like `_.sortBy` except that it allows specifying the sort
|
|
orders of the iteratees to sort by. If `orders` is unspecified, all values
|
|
are sorted in ascending order. Otherwise, specify an order of "desc" for
|
|
descending or "asc" for ascending sort order of corresponding values.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `[iteratees=[_.identity]]` *(Array[]|Function[]|Object[]|string[])*: The iteratees to sort by.
|
|
3. `[orders]` *(string[])*: The sort orders of `iteratees`.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new sorted array.
|
|
|
|
#### Example
|
|
```js
|
|
var users = [
|
|
{ 'user': 'fred', 'age': 48 },
|
|
{ 'user': 'barney', 'age': 34 },
|
|
{ 'user': 'fred', 'age': 40 },
|
|
{ 'user': 'barney', 'age': 36 }
|
|
];
|
|
|
|
// Sort by `user` in ascending order and by `age` in descending order.
|
|
_.orderBy(users, ['user', 'age'], ['asc', 'desc']);
|
|
// => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_partitioncollection-predicate_identity"></a>`_.partition(collection, [predicate=_.identity])`
|
|
<a href="#_partitioncollection-predicate_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8934 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.partition "See the npm package")
|
|
|
|
Creates an array of elements split into two groups, the first of which
|
|
contains elements `predicate` returns truthy for, the second of which
|
|
contains elements `predicate` returns falsey for. The predicate is
|
|
invoked with one argument: *(value)*.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `[predicate=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the array of grouped elements.
|
|
|
|
#### Example
|
|
```js
|
|
var users = [
|
|
{ 'user': 'barney', 'age': 36, 'active': false },
|
|
{ 'user': 'fred', 'age': 40, 'active': true },
|
|
{ 'user': 'pebbles', 'age': 1, 'active': false }
|
|
];
|
|
|
|
_.partition(users, function(o) { return o.active; });
|
|
// => objects for [['fred'], ['barney', 'pebbles']]
|
|
|
|
// The `_.matches` iteratee shorthand.
|
|
_.partition(users, { 'age': 1, 'active': false });
|
|
// => objects for [['pebbles'], ['barney', 'fred']]
|
|
|
|
// The `_.matchesProperty` iteratee shorthand.
|
|
_.partition(users, ['active', false]);
|
|
// => objects for [['barney', 'pebbles'], ['fred']]
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.partition(users, 'active');
|
|
// => objects for [['fred'], ['barney', 'pebbles']]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_reducecollection-iteratee_identity-accumulator"></a>`_.reduce(collection, [iteratee=_.identity], [accumulator])`
|
|
<a href="#_reducecollection-iteratee_identity-accumulator">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8975 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.reduce "See the npm package")
|
|
|
|
Reduces `collection` to a value which is the accumulated result of running
|
|
each element in `collection` thru `iteratee`, where each successive
|
|
invocation is supplied the return value of the previous. If `accumulator`
|
|
is not given, the first element of `collection` is used as the initial
|
|
value. The iteratee is invoked with four arguments:<br>
|
|
*(accumulator, value, index|key, collection)*.
|
|
<br>
|
|
<br>
|
|
Many lodash methods are guarded to work as iteratees for methods like
|
|
`_.reduce`, `_.reduceRight`, and `_.transform`.
|
|
<br>
|
|
<br>
|
|
The guarded methods are:<br>
|
|
`assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `orderBy`,
|
|
and `sortBy`
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration.
|
|
3. `[accumulator]` *(*)*: The initial value.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the accumulated value.
|
|
|
|
#### Example
|
|
```js
|
|
_.reduce([1, 2], function(sum, n) {
|
|
return sum + n;
|
|
}, 0);
|
|
// => 3
|
|
|
|
_.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
|
|
(result[value] || (result[value] = [])).push(key);
|
|
return result;
|
|
}, {});
|
|
// => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed)
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_reducerightcollection-iteratee_identity-accumulator"></a>`_.reduceRight(collection, [iteratee=_.identity], [accumulator])`
|
|
<a href="#_reducerightcollection-iteratee_identity-accumulator">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9004 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.reduceright "See the npm package")
|
|
|
|
This method is like `_.reduce` except that it iterates over elements of
|
|
`collection` from right to left.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration.
|
|
3. `[accumulator]` *(*)*: The initial value.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the accumulated value.
|
|
|
|
#### Example
|
|
```js
|
|
var array = [[0, 1], [2, 3], [4, 5]];
|
|
|
|
_.reduceRight(array, function(flattened, other) {
|
|
return flattened.concat(other);
|
|
}, []);
|
|
// => [4, 5, 2, 3, 0, 1]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_rejectcollection-predicate_identity"></a>`_.reject(collection, [predicate=_.identity])`
|
|
<a href="#_rejectcollection-predicate_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9046 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.reject "See the npm package")
|
|
|
|
The opposite of `_.filter`; this method returns the elements of `collection`
|
|
that `predicate` does **not** return truthy for.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `[predicate=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new filtered array.
|
|
|
|
#### Example
|
|
```js
|
|
var users = [
|
|
{ 'user': 'barney', 'age': 36, 'active': false },
|
|
{ 'user': 'fred', 'age': 40, 'active': true }
|
|
];
|
|
|
|
_.reject(users, function(o) { return !o.active; });
|
|
// => objects for ['fred']
|
|
|
|
// The `_.matches` iteratee shorthand.
|
|
_.reject(users, { 'age': 40, 'active': true });
|
|
// => objects for ['barney']
|
|
|
|
// The `_.matchesProperty` iteratee shorthand.
|
|
_.reject(users, ['active', false]);
|
|
// => objects for ['fred']
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.reject(users, 'active');
|
|
// => objects for ['barney']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_samplecollection"></a>`_.sample(collection)`
|
|
<a href="#_samplecollection">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9068 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.sample "See the npm package")
|
|
|
|
Gets a random element from `collection`.
|
|
|
|
#### Since
|
|
2.0.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to sample.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the random element.
|
|
|
|
#### Example
|
|
```js
|
|
_.sample([1, 2, 3, 4]);
|
|
// => 2
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_samplesizecollection-n1"></a>`_.sampleSize(collection, [n=1])`
|
|
<a href="#_samplesizecollection-n1">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9095 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.samplesize "See the npm package")
|
|
|
|
Gets `n` random elements at unique keys from `collection` up to the
|
|
size of `collection`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to sample.
|
|
2. `[n=1]` *(number)*: The number of elements to sample.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the random elements.
|
|
|
|
#### Example
|
|
```js
|
|
_.sampleSize([1, 2, 3], 2);
|
|
// => [3, 1]
|
|
|
|
_.sampleSize([1, 2, 3], 4);
|
|
// => [2, 3, 1]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_shufflecollection"></a>`_.shuffle(collection)`
|
|
<a href="#_shufflecollection">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9132 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.shuffle "See the npm package")
|
|
|
|
Creates an array of shuffled values, using a version of the
|
|
[Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle).
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to shuffle.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new shuffled array.
|
|
|
|
#### Example
|
|
```js
|
|
_.shuffle([1, 2, 3, 4]);
|
|
// => [4, 1, 3, 2]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_sizecollection"></a>`_.size(collection)`
|
|
<a href="#_sizecollection">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9157 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.size "See the npm package")
|
|
|
|
Gets the size of `collection` by returning its length for array-like
|
|
values or the number of own enumerable string keyed properties for objects.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to inspect.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the collection size.
|
|
|
|
#### Example
|
|
```js
|
|
_.size([1, 2, 3]);
|
|
// => 3
|
|
|
|
_.size({ 'a': 1, 'b': 2 });
|
|
// => 2
|
|
|
|
_.size('pebbles');
|
|
// => 7
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_somecollection-predicate_identity"></a>`_.some(collection, [predicate=_.identity])`
|
|
<a href="#_somecollection-predicate_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9211 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.some "See the npm package")
|
|
|
|
Checks if `predicate` returns truthy for **any** element of `collection`.
|
|
Iteration is stopped once `predicate` returns truthy. The predicate is
|
|
invoked with three arguments: *(value, index|key, collection)*.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `[predicate=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if any element passes the predicate check, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.some([null, 0, 'yes', false], Boolean);
|
|
// => true
|
|
|
|
var users = [
|
|
{ 'user': 'barney', 'active': true },
|
|
{ 'user': 'fred', 'active': false }
|
|
];
|
|
|
|
// The `_.matches` iteratee shorthand.
|
|
_.some(users, { 'user': 'barney', 'active': false });
|
|
// => false
|
|
|
|
// The `_.matchesProperty` iteratee shorthand.
|
|
_.some(users, ['active', false]);
|
|
// => true
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.some(users, 'active');
|
|
// => true
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_sortbycollection-iteratees_identity"></a>`_.sortBy(collection, [iteratees=[_.identity]])`
|
|
<a href="#_sortbycollection-iteratees_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9253 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.sortby "See the npm package")
|
|
|
|
Creates an array of elements, sorted in ascending order by the results of
|
|
running each element in a collection thru each iteratee. This method
|
|
performs a stable sort, that is, it preserves the original sort order of
|
|
equal elements. The iteratees are invoked with one argument: *(value)*.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `collection` *(Array|Object)*: The collection to iterate over.
|
|
2. `[iteratees=[_.identity]]` *(...(Array|Array[]|Function|Function[]|Object|Object[]|string|string[]))*: The iteratees to sort by.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new sorted array.
|
|
|
|
#### Example
|
|
```js
|
|
var users = [
|
|
{ 'user': 'fred', 'age': 48 },
|
|
{ 'user': 'barney', 'age': 36 },
|
|
{ 'user': 'fred', 'age': 40 },
|
|
{ 'user': 'barney', 'age': 34 }
|
|
];
|
|
|
|
_.sortBy(users, function(o) { return o.user; });
|
|
// => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
|
|
|
|
_.sortBy(users, ['user', 'age']);
|
|
// => objects for [['barney', 34], ['barney', 36], ['fred', 40], ['fred', 48]]
|
|
|
|
_.sortBy(users, 'user', function(o) {
|
|
return Math.floor(o.age / 10);
|
|
});
|
|
// => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
## `“Date” Methods`
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_now"></a>`_.now()`
|
|
<a href="#_now">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9288 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.now "See the npm package")
|
|
|
|
Gets the timestamp of the number of milliseconds that have elapsed since
|
|
the Unix epoch *(1 January `1970 00`:00:00 UTC)*.
|
|
|
|
#### Since
|
|
2.4.0
|
|
#### Returns
|
|
*(number)*: Returns the timestamp.
|
|
|
|
#### Example
|
|
```js
|
|
_.defer(function(stamp) {
|
|
console.log(_.now() - stamp);
|
|
}, _.now());
|
|
// => Logs the number of milliseconds it took for the deferred invocation.
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
## `“Function” Methods`
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_aftern-func"></a>`_.after(n, func)`
|
|
<a href="#_aftern-func">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9318 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.after "See the npm package")
|
|
|
|
The opposite of `_.before`; this method creates a function that invokes
|
|
`func` once it's called `n` or more times.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `n` *(number)*: The number of calls before `func` is invoked.
|
|
2. `func` *(Function)*: The function to restrict.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new restricted function.
|
|
|
|
#### Example
|
|
```js
|
|
var saves = ['profile', 'settings'];
|
|
|
|
var done = _.after(saves.length, function() {
|
|
console.log('done saving!');
|
|
});
|
|
|
|
_.forEach(saves, function(type) {
|
|
asyncSave({ 'type': type, 'complete': done });
|
|
});
|
|
// => Logs 'done saving!' after the two async saves have completed.
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_aryfunc-nfunclength"></a>`_.ary(func, [n=func.length])`
|
|
<a href="#_aryfunc-nfunclength">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9347 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.ary "See the npm package")
|
|
|
|
Creates a function that invokes `func`, with up to `n` arguments,
|
|
ignoring any additional arguments.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to cap arguments for.
|
|
2. `[n=func.length]` *(number)*: The arity cap.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new capped function.
|
|
|
|
#### Example
|
|
```js
|
|
_.map(['6', '8', '10'], _.ary(parseInt, 1));
|
|
// => [6, 8, 10]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_beforen-func"></a>`_.before(n, func)`
|
|
<a href="#_beforen-func">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9370 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.before "See the npm package")
|
|
|
|
Creates a function that invokes `func`, with the `this` binding and arguments
|
|
of the created function, while it's called less than `n` times. Subsequent
|
|
calls to the created function return the result of the last `func` invocation.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `n` *(number)*: The number of calls at which `func` is no longer invoked.
|
|
2. `func` *(Function)*: The function to restrict.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new restricted function.
|
|
|
|
#### Example
|
|
```js
|
|
jQuery(element).on('click', _.before(5, addContactToList));
|
|
// => allows adding up to 4 contacts to the list
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_bindfunc-thisarg-partials"></a>`_.bind(func, thisArg, [partials])`
|
|
<a href="#_bindfunc-thisarg-partials">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9422 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.bind "See the npm package")
|
|
|
|
Creates a function that invokes `func` with the `this` binding of `thisArg`
|
|
and `partials` prepended to the arguments it receives.
|
|
<br>
|
|
<br>
|
|
The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
|
|
may be used as a placeholder for partially applied arguments.
|
|
<br>
|
|
<br>
|
|
**Note:** Unlike native `Function#bind`, this method doesn't set the "length"
|
|
property of bound functions.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to bind.
|
|
2. `thisArg` *(*)*: The `this` binding of `func`.
|
|
3. `[partials]` *(...*)*: The arguments to be partially applied.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new bound function.
|
|
|
|
#### Example
|
|
```js
|
|
var greet = function(greeting, punctuation) {
|
|
return greeting + ' ' + this.user + punctuation;
|
|
};
|
|
|
|
var object = { 'user': 'fred' };
|
|
|
|
var bound = _.bind(greet, object, 'hi');
|
|
bound('!');
|
|
// => 'hi fred!'
|
|
|
|
// Bound with placeholders.
|
|
var bound = _.bind(greet, object, _, '!');
|
|
bound('hi');
|
|
// => 'hi fred!'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_bindkeyobject-key-partials"></a>`_.bindKey(object, key, [partials])`
|
|
<a href="#_bindkeyobject-key-partials">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9476 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.bindkey "See the npm package")
|
|
|
|
Creates a function that invokes the method at `object[key]` with `partials`
|
|
prepended to the arguments it receives.
|
|
<br>
|
|
<br>
|
|
This method differs from `_.bind` by allowing bound functions to reference
|
|
methods that may be redefined or don't yet exist. See
|
|
[Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definition-pattern)
|
|
for more details.
|
|
<br>
|
|
<br>
|
|
The `_.bindKey.placeholder` value, which defaults to `_` in monolithic
|
|
builds, may be used as a placeholder for partially applied arguments.
|
|
|
|
#### Since
|
|
0.10.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to invoke the method on.
|
|
2. `key` *(string)*: The key of the method.
|
|
3. `[partials]` *(...*)*: The arguments to be partially applied.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new bound function.
|
|
|
|
#### Example
|
|
```js
|
|
var object = {
|
|
'user': 'fred',
|
|
'greet': function(greeting, punctuation) {
|
|
return greeting + ' ' + this.user + punctuation;
|
|
}
|
|
};
|
|
|
|
var bound = _.bindKey(object, 'greet', 'hi');
|
|
bound('!');
|
|
// => 'hi fred!'
|
|
|
|
object.greet = function(greeting, punctuation) {
|
|
return greeting + 'ya ' + this.user + punctuation;
|
|
};
|
|
|
|
bound('!');
|
|
// => 'hiya fred!'
|
|
|
|
// Bound with placeholders.
|
|
var bound = _.bindKey(object, 'greet', _, '!');
|
|
bound('hi');
|
|
// => 'hiya fred!'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_curryfunc-arityfunclength"></a>`_.curry(func, [arity=func.length])`
|
|
<a href="#_curryfunc-arityfunclength">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9526 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.curry "See the npm package")
|
|
|
|
Creates a function that accepts arguments of `func` and either invokes
|
|
`func` returning its result, if at least `arity` number of arguments have
|
|
been provided, or returns a function that accepts the remaining `func`
|
|
arguments, and so on. The arity of `func` may be specified if `func.length`
|
|
is not sufficient.
|
|
<br>
|
|
<br>
|
|
The `_.curry.placeholder` value, which defaults to `_` in monolithic builds,
|
|
may be used as a placeholder for provided arguments.
|
|
<br>
|
|
<br>
|
|
**Note:** This method doesn't set the "length" property of curried functions.
|
|
|
|
#### Since
|
|
2.0.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to curry.
|
|
2. `[arity=func.length]` *(number)*: The arity of `func`.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new curried function.
|
|
|
|
#### Example
|
|
```js
|
|
var abc = function(a, b, c) {
|
|
return [a, b, c];
|
|
};
|
|
|
|
var curried = _.curry(abc);
|
|
|
|
curried(1)(2)(3);
|
|
// => [1, 2, 3]
|
|
|
|
curried(1, 2)(3);
|
|
// => [1, 2, 3]
|
|
|
|
curried(1, 2, 3);
|
|
// => [1, 2, 3]
|
|
|
|
// Curried with placeholders.
|
|
curried(1)(_, 3)(2);
|
|
// => [1, 2, 3]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_curryrightfunc-arityfunclength"></a>`_.curryRight(func, [arity=func.length])`
|
|
<a href="#_curryrightfunc-arityfunclength">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9571 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.curryright "See the npm package")
|
|
|
|
This method is like `_.curry` except that arguments are applied to `func`
|
|
in the manner of `_.partialRight` instead of `_.partial`.
|
|
<br>
|
|
<br>
|
|
The `_.curryRight.placeholder` value, which defaults to `_` in monolithic
|
|
builds, may be used as a placeholder for provided arguments.
|
|
<br>
|
|
<br>
|
|
**Note:** This method doesn't set the "length" property of curried functions.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to curry.
|
|
2. `[arity=func.length]` *(number)*: The arity of `func`.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new curried function.
|
|
|
|
#### Example
|
|
```js
|
|
var abc = function(a, b, c) {
|
|
return [a, b, c];
|
|
};
|
|
|
|
var curried = _.curryRight(abc);
|
|
|
|
curried(3)(2)(1);
|
|
// => [1, 2, 3]
|
|
|
|
curried(2, 3)(1);
|
|
// => [1, 2, 3]
|
|
|
|
curried(1, 2, 3);
|
|
// => [1, 2, 3]
|
|
|
|
// Curried with placeholders.
|
|
curried(3)(1, _)(2);
|
|
// => [1, 2, 3]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_debouncefunc-wait0-options-optionsleadingfalse-optionsmaxwait-optionstrailingtrue"></a>`_.debounce(func, [wait=0], [options={}], [options.leading=false], [options.maxWait], [options.trailing=true])`
|
|
<a href="#_debouncefunc-wait0-options-optionsleadingfalse-optionsmaxwait-optionstrailingtrue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9628 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.debounce "See the npm package")
|
|
|
|
Creates a debounced function that delays invoking `func` until after `wait`
|
|
milliseconds have elapsed since the last time the debounced function was
|
|
invoked. The debounced function comes with a `cancel` method to cancel
|
|
delayed `func` invocations and a `flush` method to immediately invoke them.
|
|
Provide an options object to indicate whether `func` should be invoked on
|
|
the leading and/or trailing edge of the `wait` timeout. The `func` is invoked
|
|
with the last arguments provided to the debounced function. Subsequent calls
|
|
to the debounced function return the result of the last `func` invocation.
|
|
<br>
|
|
<br>
|
|
**Note:** If `leading` and `trailing` options are `true`, `func` is invoked
|
|
on the trailing edge of the timeout only if the debounced function is
|
|
invoked more than once during the `wait` timeout.
|
|
<br>
|
|
<br>
|
|
See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
|
|
for details over the differences between `_.debounce` and `_.throttle`.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to debounce.
|
|
2. `[wait=0]` *(number)*: The number of milliseconds to delay.
|
|
3. `[options={}]` *(Object)*: The options object.
|
|
4. `[options.leading=false]` *(boolean)*: Specify invoking on the leading edge of the timeout.
|
|
5. `[options.maxWait]` *(number)*: The maximum time `func` is allowed to be delayed before it's invoked.
|
|
6. `[options.trailing=true]` *(boolean)*: Specify invoking on the trailing edge of the timeout.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new debounced function.
|
|
|
|
#### Example
|
|
```js
|
|
// Avoid costly calculations while the window size is in flux.
|
|
jQuery(window).on('resize', _.debounce(calculateLayout, 150));
|
|
|
|
// Invoke `sendMail` when clicked, debouncing subsequent calls.
|
|
jQuery(element).on('click', _.debounce(sendMail, 300, {
|
|
'leading': true,
|
|
'trailing': false
|
|
}));
|
|
|
|
// Ensure `batchLog` is invoked once after 1 second of debounced calls.
|
|
var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });
|
|
var source = new EventSource('/stream');
|
|
jQuery(source).on('message', debounced);
|
|
|
|
// Cancel the trailing debounced invocation.
|
|
jQuery(window).on('popstate', debounced.cancel);
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_deferfunc-args"></a>`_.defer(func, [args])`
|
|
<a href="#_deferfunc-args">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9765 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.defer "See the npm package")
|
|
|
|
Defers invoking the `func` until the current call stack has cleared. Any
|
|
additional arguments are provided to `func` when it's invoked.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to defer.
|
|
2. `[args]` *(...*)*: The arguments to invoke `func` with.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the timer id.
|
|
|
|
#### Example
|
|
```js
|
|
_.defer(function(text) {
|
|
console.log(text);
|
|
}, 'deferred');
|
|
// => Logs 'deferred' after one or more milliseconds.
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_delayfunc-wait-args"></a>`_.delay(func, wait, [args])`
|
|
<a href="#_delayfunc-wait-args">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9788 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.delay "See the npm package")
|
|
|
|
Invokes `func` after `wait` milliseconds. Any additional arguments are
|
|
provided to `func` when it's invoked.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to delay.
|
|
2. `wait` *(number)*: The number of milliseconds to delay invocation.
|
|
3. `[args]` *(...*)*: The arguments to invoke `func` with.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the timer id.
|
|
|
|
#### Example
|
|
```js
|
|
_.delay(function(text) {
|
|
console.log(text);
|
|
}, 1000, 'later');
|
|
// => Logs 'later' after one second.
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_flipfunc"></a>`_.flip(func)`
|
|
<a href="#_flipfunc">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9810 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.flip "See the npm package")
|
|
|
|
Creates a function that invokes `func` with arguments reversed.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to flip arguments for.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new flipped function.
|
|
|
|
#### Example
|
|
```js
|
|
var flipped = _.flip(function() {
|
|
return _.toArray(arguments);
|
|
});
|
|
|
|
flipped('a', 'b', 'c', 'd');
|
|
// => ['d', 'c', 'b', 'a']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_memoizefunc-resolver"></a>`_.memoize(func, [resolver])`
|
|
<a href="#_memoizefunc-resolver">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9858 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.memoize "See the npm package")
|
|
|
|
Creates a function that memoizes the result of `func`. If `resolver` is
|
|
provided, it determines the cache key for storing the result based on the
|
|
arguments provided to the memoized function. By default, the first argument
|
|
provided to the memoized function is used as the map cache key. The `func`
|
|
is invoked with the `this` binding of the memoized function.
|
|
<br>
|
|
<br>
|
|
**Note:** The cache is exposed as the `cache` property on the memoized
|
|
function. Its creation may be customized by replacing the `_.memoize.Cache`
|
|
constructor with one whose instances implement the
|
|
[`Map`](http://ecma-international.org/ecma-262/6.0/#sec-properties-of-the-map-prototype-object)
|
|
method interface of `delete`, `get`, `has`, and `set`.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to have its output memoized.
|
|
2. `[resolver]` *(Function)*: The function to resolve the cache key.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new memoized function.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'a': 1, 'b': 2 };
|
|
var other = { 'c': 3, 'd': 4 };
|
|
|
|
var values = _.memoize(_.values);
|
|
values(object);
|
|
// => [1, 2]
|
|
|
|
values(other);
|
|
// => [3, 4]
|
|
|
|
object.a = 2;
|
|
values(object);
|
|
// => [1, 2]
|
|
|
|
// Modify the result cache.
|
|
values.cache.set(object, ['a', 'b']);
|
|
values(object);
|
|
// => ['a', 'b']
|
|
|
|
// Replace `_.memoize.Cache`.
|
|
_.memoize.Cache = WeakMap;
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_negatepredicate"></a>`_.negate(predicate)`
|
|
<a href="#_negatepredicate">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9901 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.negate "See the npm package")
|
|
|
|
Creates a function that negates the result of the predicate `func`. The
|
|
`func` predicate is invoked with the `this` binding and arguments of the
|
|
created function.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `predicate` *(Function)*: The predicate to negate.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new negated function.
|
|
|
|
#### Example
|
|
```js
|
|
function isEven(n) {
|
|
return n % 2 == 0;
|
|
}
|
|
|
|
_.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));
|
|
// => [1, 3, 5]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_oncefunc"></a>`_.once(func)`
|
|
<a href="#_oncefunc">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9928 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.once "See the npm package")
|
|
|
|
Creates a function that is restricted to invoking `func` once. Repeat calls
|
|
to the function return the value of the first invocation. The `func` is
|
|
invoked with the `this` binding and arguments of the created function.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to restrict.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new restricted function.
|
|
|
|
#### Example
|
|
```js
|
|
var initialize = _.once(createApplication);
|
|
initialize();
|
|
initialize();
|
|
// `initialize` invokes `createApplication` once
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_overargsfunc"></a>`_.overArgs(func)`
|
|
<a href="#_overargsfunc">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L9964 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.overargs "See the npm package")
|
|
|
|
Creates a function that invokes `func` with arguments transformed by
|
|
corresponding `transforms`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to wrap.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new function.
|
|
|
|
#### Example
|
|
```js
|
|
function doubled(n) {
|
|
return n * 2;
|
|
}
|
|
|
|
function square(n) {
|
|
return n * n;
|
|
}
|
|
|
|
var func = _.overArgs(function(x, y) {
|
|
return [x, y];
|
|
}, [square, doubled]);
|
|
|
|
func(9, 3);
|
|
// => [81, 6]
|
|
|
|
func(10, 5);
|
|
// => [100, 10]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_partialfunc-partials"></a>`_.partial(func, [partials])`
|
|
<a href="#_partialfunc-partials">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10014 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.partial "See the npm package")
|
|
|
|
Creates a function that invokes `func` with `partials` prepended to the
|
|
arguments it receives. This method is like `_.bind` except it does **not**
|
|
alter the `this` binding.
|
|
<br>
|
|
<br>
|
|
The `_.partial.placeholder` value, which defaults to `_` in monolithic
|
|
builds, may be used as a placeholder for partially applied arguments.
|
|
<br>
|
|
<br>
|
|
**Note:** This method doesn't set the "length" property of partially
|
|
applied functions.
|
|
|
|
#### Since
|
|
0.2.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to partially apply arguments to.
|
|
2. `[partials]` *(...*)*: The arguments to be partially applied.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new partially applied function.
|
|
|
|
#### Example
|
|
```js
|
|
var greet = function(greeting, name) {
|
|
return greeting + ' ' + name;
|
|
};
|
|
|
|
var sayHelloTo = _.partial(greet, 'hello');
|
|
sayHelloTo('fred');
|
|
// => 'hello fred'
|
|
|
|
// Partially applied with placeholders.
|
|
var greetFred = _.partial(greet, _, 'fred');
|
|
greetFred('hi');
|
|
// => 'hi fred'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_partialrightfunc-partials"></a>`_.partialRight(func, [partials])`
|
|
<a href="#_partialrightfunc-partials">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10051 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.partialright "See the npm package")
|
|
|
|
This method is like `_.partial` except that partially applied arguments
|
|
are appended to the arguments it receives.
|
|
<br>
|
|
<br>
|
|
The `_.partialRight.placeholder` value, which defaults to `_` in monolithic
|
|
builds, may be used as a placeholder for partially applied arguments.
|
|
<br>
|
|
<br>
|
|
**Note:** This method doesn't set the "length" property of partially
|
|
applied functions.
|
|
|
|
#### Since
|
|
1.0.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to partially apply arguments to.
|
|
2. `[partials]` *(...*)*: The arguments to be partially applied.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new partially applied function.
|
|
|
|
#### Example
|
|
```js
|
|
var greet = function(greeting, name) {
|
|
return greeting + ' ' + name;
|
|
};
|
|
|
|
var greetFred = _.partialRight(greet, 'fred');
|
|
greetFred('hi');
|
|
// => 'hi fred'
|
|
|
|
// Partially applied with placeholders.
|
|
var sayHelloTo = _.partialRight(greet, 'hello', _);
|
|
sayHelloTo('fred');
|
|
// => 'hello fred'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_reargfunc-indexes"></a>`_.rearg(func, indexes)`
|
|
<a href="#_reargfunc-indexes">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10078 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.rearg "See the npm package")
|
|
|
|
Creates a function that invokes `func` with arguments arranged according
|
|
to the specified `indexes` where the argument value at the first index is
|
|
provided as the first argument, the argument value at the second index is
|
|
provided as the second argument, and so on.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to rearrange arguments for.
|
|
2. `indexes` *(...(number|number[]))*: The arranged argument indexes.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new function.
|
|
|
|
#### Example
|
|
```js
|
|
var rearged = _.rearg(function(a, b, c) {
|
|
return [a, b, c];
|
|
}, [2, 0, 1]);
|
|
|
|
rearged('b', 'c', 'a')
|
|
// => ['a', 'b', 'c']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_restfunc-startfunclength-1"></a>`_.rest(func, [start=func.length-1])`
|
|
<a href="#_restfunc-startfunclength-1">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10107 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.rest "See the npm package")
|
|
|
|
Creates a function that invokes `func` with the `this` binding of the
|
|
created function and arguments from `start` and beyond provided as
|
|
an array.
|
|
<br>
|
|
<br>
|
|
**Note:** This method is based on the
|
|
[rest parameter](https://mdn.io/rest_parameters).
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to apply a rest parameter to.
|
|
2. `[start=func.length-1]` *(number)*: The start position of the rest parameter.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new function.
|
|
|
|
#### Example
|
|
```js
|
|
var say = _.rest(function(what, names) {
|
|
return what + ' ' + _.initial(names).join(', ') +
|
|
(_.size(names) > 1 ? ', & ' : '') + _.last(names);
|
|
});
|
|
|
|
say('hello', 'fred', 'barney', 'pebbles');
|
|
// => 'hello fred, barney, & pebbles'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_spreadfunc-start0"></a>`_.spread(func, [start=0])`
|
|
<a href="#_spreadfunc-start0">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10170 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.spread "See the npm package")
|
|
|
|
Creates a function that invokes `func` with the `this` binding of the
|
|
create function and an array of arguments much like
|
|
[`Function#apply`](http://www.ecma-international.org/ecma-262/6.0/#sec-function.prototype.apply).
|
|
<br>
|
|
<br>
|
|
**Note:** This method is based on the
|
|
[spread operator](https://mdn.io/spread_operator).
|
|
|
|
#### Since
|
|
3.2.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to spread arguments over.
|
|
2. `[start=0]` *(number)*: The start position of the spread.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new function.
|
|
|
|
#### Example
|
|
```js
|
|
var say = _.spread(function(who, what) {
|
|
return who + ' says ' + what;
|
|
});
|
|
|
|
say(['fred', 'hello']);
|
|
// => 'fred says hello'
|
|
|
|
var numbers = Promise.all([
|
|
Promise.resolve(40),
|
|
Promise.resolve(36)
|
|
]);
|
|
|
|
numbers.then(_.spread(function(x, y) {
|
|
return x + y;
|
|
}));
|
|
// => a Promise of 76
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_throttlefunc-wait0-options-optionsleadingtrue-optionstrailingtrue"></a>`_.throttle(func, [wait=0], [options={}], [options.leading=true], [options.trailing=true])`
|
|
<a href="#_throttlefunc-wait0-options-optionsleadingtrue-optionstrailingtrue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10227 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.throttle "See the npm package")
|
|
|
|
Creates a throttled function that only invokes `func` at most once per
|
|
every `wait` milliseconds. The throttled function comes with a `cancel`
|
|
method to cancel delayed `func` invocations and a `flush` method to
|
|
immediately invoke them. Provide an options object to indicate whether
|
|
`func` should be invoked on the leading and/or trailing edge of the `wait`
|
|
timeout. The `func` is invoked with the last arguments provided to the
|
|
throttled function. Subsequent calls to the throttled function return the
|
|
result of the last `func` invocation.
|
|
<br>
|
|
<br>
|
|
**Note:** If `leading` and `trailing` options are `true`, `func` is
|
|
invoked on the trailing edge of the timeout only if the throttled function
|
|
is invoked more than once during the `wait` timeout.
|
|
<br>
|
|
<br>
|
|
See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
|
|
for details over the differences between `_.throttle` and `_.debounce`.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to throttle.
|
|
2. `[wait=0]` *(number)*: The number of milliseconds to throttle invocations to.
|
|
3. `[options={}]` *(Object)*: The options object.
|
|
4. `[options.leading=true]` *(boolean)*: Specify invoking on the leading edge of the timeout.
|
|
5. `[options.trailing=true]` *(boolean)*: Specify invoking on the trailing edge of the timeout.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new throttled function.
|
|
|
|
#### Example
|
|
```js
|
|
// Avoid excessively updating the position while scrolling.
|
|
jQuery(window).on('scroll', _.throttle(updatePosition, 100));
|
|
|
|
// Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes.
|
|
var throttled = _.throttle(renewToken, 300000, { 'trailing': false });
|
|
jQuery(element).on('click', throttled);
|
|
|
|
// Cancel the trailing throttled invocation.
|
|
jQuery(window).on('popstate', throttled.cancel);
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_unaryfunc"></a>`_.unary(func)`
|
|
<a href="#_unaryfunc">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10260 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.unary "See the npm package")
|
|
|
|
Creates a function that accepts up to one argument, ignoring any
|
|
additional arguments.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to cap arguments for.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new capped function.
|
|
|
|
#### Example
|
|
```js
|
|
_.map(['6', '8', '10'], _.unary(parseInt));
|
|
// => [6, 8, 10]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_wrapvalue-wrapperidentity"></a>`_.wrap(value, [wrapper=identity])`
|
|
<a href="#_wrapvalue-wrapperidentity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10286 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.wrap "See the npm package")
|
|
|
|
Creates a function that provides `value` to the wrapper function as its
|
|
first argument. Any additional arguments provided to the function are
|
|
appended to those provided to the wrapper function. The wrapper is invoked
|
|
with the `this` binding of the created function.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to wrap.
|
|
2. `[wrapper=identity]` *(Function)*: The wrapper function.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new function.
|
|
|
|
#### Example
|
|
```js
|
|
var p = _.wrap(_.escape, function(func, text) {
|
|
return '<p>' + func(text) + '</p>';
|
|
});
|
|
|
|
p('fred, barney, & pebbles');
|
|
// => '<p>fred, barney, & pebbles</p>'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
## `“Lang” Methods`
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_castarrayvalue"></a>`_.castArray(value)`
|
|
<a href="#_castarrayvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10326 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.castarray "See the npm package")
|
|
|
|
Casts `value` as an array if it's not one.
|
|
|
|
#### Since
|
|
4.4.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to inspect.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the cast array.
|
|
|
|
#### Example
|
|
```js
|
|
_.castArray(1);
|
|
// => [1]
|
|
|
|
_.castArray({ 'a': 1 });
|
|
// => [{ 'a': 1 }]
|
|
|
|
_.castArray('abc');
|
|
// => ['abc']
|
|
|
|
_.castArray(null);
|
|
// => [null]
|
|
|
|
_.castArray(undefined);
|
|
// => [undefined]
|
|
|
|
_.castArray();
|
|
// => []
|
|
|
|
var array = [1, 2, 3];
|
|
console.log(_.castArray(array) === array);
|
|
// => true
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_clonevalue"></a>`_.clone(value)`
|
|
<a href="#_clonevalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10360 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.clone "See the npm package")
|
|
|
|
Creates a shallow clone of `value`.
|
|
<br>
|
|
<br>
|
|
**Note:** This method is loosely based on the
|
|
[structured clone algorithm](https://mdn.io/Structured_clone_algorithm)
|
|
and supports cloning arrays, array buffers, booleans, date objects, maps,
|
|
numbers, `Object` objects, regexes, sets, strings, symbols, and typed
|
|
arrays. The own enumerable properties of `arguments` objects are cloned
|
|
as plain objects. An empty object is returned for uncloneable values such
|
|
as error objects, functions, DOM nodes, and WeakMaps.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to clone.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the cloned value.
|
|
|
|
#### Example
|
|
```js
|
|
var objects = [{ 'a': 1 }, { 'b': 2 }];
|
|
|
|
var shallow = _.clone(objects);
|
|
console.log(shallow[0] === objects[0]);
|
|
// => true
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_clonedeepvalue"></a>`_.cloneDeep(value)`
|
|
<a href="#_clonedeepvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10417 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.clonedeep "See the npm package")
|
|
|
|
This method is like `_.clone` except that it recursively clones `value`.
|
|
|
|
#### Since
|
|
1.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to recursively clone.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the deep cloned value.
|
|
|
|
#### Example
|
|
```js
|
|
var objects = [{ 'a': 1 }, { 'b': 2 }];
|
|
|
|
var deep = _.cloneDeep(objects);
|
|
console.log(deep[0] === objects[0]);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_clonedeepwithvalue-customizer"></a>`_.cloneDeepWith(value, [customizer])`
|
|
<a href="#_clonedeepwithvalue-customizer">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10449 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.clonedeepwith "See the npm package")
|
|
|
|
This method is like `_.cloneWith` except that it recursively clones `value`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to recursively clone.
|
|
2. `[customizer]` *(Function)*: The function to customize cloning.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the deep cloned value.
|
|
|
|
#### Example
|
|
```js
|
|
function customizer(value) {
|
|
if (_.isElement(value)) {
|
|
return value.cloneNode(true);
|
|
}
|
|
}
|
|
|
|
var el = _.cloneDeepWith(document.body, customizer);
|
|
|
|
console.log(el === document.body);
|
|
// => false
|
|
console.log(el.nodeName);
|
|
// => 'BODY'
|
|
console.log(el.childNodes.length);
|
|
// => 20
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_clonewithvalue-customizer"></a>`_.cloneWith(value, [customizer])`
|
|
<a href="#_clonewithvalue-customizer">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10395 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.clonewith "See the npm package")
|
|
|
|
This method is like `_.clone` except that it accepts `customizer` which
|
|
is invoked to produce the cloned value. If `customizer` returns `undefined`,
|
|
cloning is handled by the method instead. The `customizer` is invoked with
|
|
up to four arguments; *(value [, index|key, object, stack])*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to clone.
|
|
2. `[customizer]` *(Function)*: The function to customize cloning.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the cloned value.
|
|
|
|
#### Example
|
|
```js
|
|
function customizer(value) {
|
|
if (_.isElement(value)) {
|
|
return value.cloneNode(false);
|
|
}
|
|
}
|
|
|
|
var el = _.cloneWith(document.body, customizer);
|
|
|
|
console.log(el === document.body);
|
|
// => false
|
|
console.log(el.nodeName);
|
|
// => 'BODY'
|
|
console.log(el.childNodes.length);
|
|
// => 0
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_eqvalue-other"></a>`_.eq(value, other)`
|
|
<a href="#_eqvalue-other">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10485 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.eq "See the npm package")
|
|
|
|
Performs a
|
|
[`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
|
|
comparison between two values to determine if they are equivalent.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to compare.
|
|
2. `other` *(*)*: The other value to compare.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if the values are equivalent, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'user': 'fred' };
|
|
var other = { 'user': 'fred' };
|
|
|
|
_.eq(object, object);
|
|
// => true
|
|
|
|
_.eq(object, other);
|
|
// => false
|
|
|
|
_.eq('a', 'a');
|
|
// => true
|
|
|
|
_.eq('a', Object('a'));
|
|
// => false
|
|
|
|
_.eq(NaN, NaN);
|
|
// => true
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_gtvalue-other"></a>`_.gt(value, other)`
|
|
<a href="#_gtvalue-other">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10512 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.gt "See the npm package")
|
|
|
|
Checks if `value` is greater than `other`.
|
|
|
|
#### Since
|
|
3.9.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to compare.
|
|
2. `other` *(*)*: The other value to compare.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is greater than `other`, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.gt(3, 1);
|
|
// => true
|
|
|
|
_.gt(3, 3);
|
|
// => false
|
|
|
|
_.gt(1, 3);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_gtevalue-other"></a>`_.gte(value, other)`
|
|
<a href="#_gtevalue-other">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10537 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.gte "See the npm package")
|
|
|
|
Checks if `value` is greater than or equal to `other`.
|
|
|
|
#### Since
|
|
3.9.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to compare.
|
|
2. `other` *(*)*: The other value to compare.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is greater than or equal to `other`, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.gte(3, 1);
|
|
// => true
|
|
|
|
_.gte(3, 3);
|
|
// => true
|
|
|
|
_.gte(1, 3);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isargumentsvalue"></a>`_.isArguments(value)`
|
|
<a href="#_isargumentsvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10559 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isarguments "See the npm package")
|
|
|
|
Checks if `value` is likely an `arguments` object.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isArguments(function() { return arguments; }());
|
|
// => true
|
|
|
|
_.isArguments([1, 2, 3]);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isarrayvalue"></a>`_.isArray(value)`
|
|
<a href="#_isarrayvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10590 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isarray "See the npm package")
|
|
|
|
Checks if `value` is classified as an `Array` object.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isArray([1, 2, 3]);
|
|
// => true
|
|
|
|
_.isArray(document.body.children);
|
|
// => false
|
|
|
|
_.isArray('abc');
|
|
// => false
|
|
|
|
_.isArray(_.noop);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isarraybuffervalue"></a>`_.isArrayBuffer(value)`
|
|
<a href="#_isarraybuffervalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10610 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isarraybuffer "See the npm package")
|
|
|
|
Checks if `value` is classified as an `ArrayBuffer` object.
|
|
|
|
#### Since
|
|
4.3.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isArrayBuffer(new ArrayBuffer(2));
|
|
// => true
|
|
|
|
_.isArrayBuffer(new Array(2));
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isarraylikevalue"></a>`_.isArrayLike(value)`
|
|
<a href="#_isarraylikevalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10639 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isarraylike "See the npm package")
|
|
|
|
Checks if `value` is array-like. A value is considered array-like if it's
|
|
not a function and has a `value.length` that's an integer greater than or
|
|
equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is array-like, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isArrayLike([1, 2, 3]);
|
|
// => true
|
|
|
|
_.isArrayLike(document.body.children);
|
|
// => true
|
|
|
|
_.isArrayLike('abc');
|
|
// => true
|
|
|
|
_.isArrayLike(_.noop);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isarraylikeobjectvalue"></a>`_.isArrayLikeObject(value)`
|
|
<a href="#_isarraylikeobjectvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10668 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isarraylikeobject "See the npm package")
|
|
|
|
This method is like `_.isArrayLike` except that it also checks if `value`
|
|
is an object.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is an array-like object, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isArrayLikeObject([1, 2, 3]);
|
|
// => true
|
|
|
|
_.isArrayLikeObject(document.body.children);
|
|
// => true
|
|
|
|
_.isArrayLikeObject('abc');
|
|
// => false
|
|
|
|
_.isArrayLikeObject(_.noop);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isbooleanvalue"></a>`_.isBoolean(value)`
|
|
<a href="#_isbooleanvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10690 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isboolean "See the npm package")
|
|
|
|
Checks if `value` is classified as a boolean primitive or object.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isBoolean(false);
|
|
// => true
|
|
|
|
_.isBoolean(null);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isbuffervalue"></a>`_.isBuffer(value)`
|
|
<a href="#_isbuffervalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10712 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isbuffer "See the npm package")
|
|
|
|
Checks if `value` is a buffer.
|
|
|
|
#### Since
|
|
4.3.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is a buffer, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isBuffer(new Buffer(2));
|
|
// => true
|
|
|
|
_.isBuffer(new Uint8Array(2));
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isdatevalue"></a>`_.isDate(value)`
|
|
<a href="#_isdatevalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10734 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isdate "See the npm package")
|
|
|
|
Checks if `value` is classified as a `Date` object.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isDate(new Date);
|
|
// => true
|
|
|
|
_.isDate('Mon April 23 2012');
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_iselementvalue"></a>`_.isElement(value)`
|
|
<a href="#_iselementvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10756 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.iselement "See the npm package")
|
|
|
|
Checks if `value` is likely a DOM element.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is a DOM element, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isElement(document.body);
|
|
// => true
|
|
|
|
_.isElement('<body>');
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isemptyvalue"></a>`_.isEmpty(value)`
|
|
<a href="#_isemptyvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10793 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isempty "See the npm package")
|
|
|
|
Checks if `value` is an empty object, collection, map, or set.
|
|
<br>
|
|
<br>
|
|
Objects are considered empty if they have no own enumerable string keyed
|
|
properties.
|
|
<br>
|
|
<br>
|
|
Array-like values such as `arguments` objects, arrays, buffers, strings, or
|
|
jQuery-like collections are considered empty if they have a `length` of `0`.
|
|
Similarly, maps and sets are considered empty if they have a `size` of `0`.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is empty, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isEmpty(null);
|
|
// => true
|
|
|
|
_.isEmpty(true);
|
|
// => true
|
|
|
|
_.isEmpty(1);
|
|
// => true
|
|
|
|
_.isEmpty([1, 2, 3]);
|
|
// => false
|
|
|
|
_.isEmpty({ 'a': 1 });
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isequalvalue-other"></a>`_.isEqual(value, other)`
|
|
<a href="#_isequalvalue-other">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10842 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isequal "See the npm package")
|
|
|
|
Performs a deep comparison between two values to determine if they are
|
|
equivalent.
|
|
<br>
|
|
<br>
|
|
**Note:** This method supports comparing arrays, array buffers, booleans,
|
|
date objects, error objects, maps, numbers, `Object` objects, regexes,
|
|
sets, strings, symbols, and typed arrays. `Object` objects are compared
|
|
by their own, not inherited, enumerable properties. Functions and DOM
|
|
nodes are **not** supported.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to compare.
|
|
2. `other` *(*)*: The other value to compare.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if the values are equivalent, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'user': 'fred' };
|
|
var other = { 'user': 'fred' };
|
|
|
|
_.isEqual(object, other);
|
|
// => true
|
|
|
|
object === other;
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isequalwithvalue-other-customizer"></a>`_.isEqualWith(value, other, [customizer])`
|
|
<a href="#_isequalwithvalue-other-customizer">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10879 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isequalwith "See the npm package")
|
|
|
|
This method is like `_.isEqual` except that it accepts `customizer` which
|
|
is invoked to compare values. If `customizer` returns `undefined`, comparisons
|
|
are handled by the method instead. The `customizer` is invoked with up to
|
|
six arguments: *(objValue, othValue [, index|key, object, other, stack])*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to compare.
|
|
2. `other` *(*)*: The other value to compare.
|
|
3. `[customizer]` *(Function)*: The function to customize comparisons.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if the values are equivalent, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
function isGreeting(value) {
|
|
return /^h(?:i|ello)$/.test(value);
|
|
}
|
|
|
|
function customizer(objValue, othValue) {
|
|
if (isGreeting(objValue) && isGreeting(othValue)) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
var array = ['hello', 'goodbye'];
|
|
var other = ['hi', 'goodbye'];
|
|
|
|
_.isEqualWith(array, other, customizer);
|
|
// => true
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_iserrorvalue"></a>`_.isError(value)`
|
|
<a href="#_iserrorvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10904 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.iserror "See the npm package")
|
|
|
|
Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`,
|
|
`SyntaxError`, `TypeError`, or `URIError` object.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is an error object, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isError(new Error);
|
|
// => true
|
|
|
|
_.isError(Error);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isfinitevalue"></a>`_.isFinite(value)`
|
|
<a href="#_isfinitevalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10939 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isfinite "See the npm package")
|
|
|
|
Checks if `value` is a finite primitive number.
|
|
<br>
|
|
<br>
|
|
**Note:** This method is based on
|
|
[`Number.isFinite`](https://mdn.io/Number/isFinite).
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is a finite number, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isFinite(3);
|
|
// => true
|
|
|
|
_.isFinite(Number.MIN_VALUE);
|
|
// => true
|
|
|
|
_.isFinite(Infinity);
|
|
// => false
|
|
|
|
_.isFinite('3');
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isfunctionvalue"></a>`_.isFunction(value)`
|
|
<a href="#_isfunctionvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10961 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isfunction "See the npm package")
|
|
|
|
Checks if `value` is classified as a `Function` object.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isFunction(_);
|
|
// => true
|
|
|
|
_.isFunction(/abc/);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isintegervalue"></a>`_.isInteger(value)`
|
|
<a href="#_isintegervalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L10995 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isinteger "See the npm package")
|
|
|
|
Checks if `value` is an integer.
|
|
<br>
|
|
<br>
|
|
**Note:** This method is based on
|
|
[`Number.isInteger`](https://mdn.io/Number/isInteger).
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is an integer, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isInteger(3);
|
|
// => true
|
|
|
|
_.isInteger(Number.MIN_VALUE);
|
|
// => false
|
|
|
|
_.isInteger(Infinity);
|
|
// => false
|
|
|
|
_.isInteger('3');
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_islengthvalue"></a>`_.isLength(value)`
|
|
<a href="#_islengthvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11026 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.islength "See the npm package")
|
|
|
|
Checks if `value` is a valid array-like length.
|
|
<br>
|
|
<br>
|
|
**Note:** This function is loosely based on
|
|
[`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is a valid length, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isLength(3);
|
|
// => true
|
|
|
|
_.isLength(Number.MIN_VALUE);
|
|
// => false
|
|
|
|
_.isLength(Infinity);
|
|
// => false
|
|
|
|
_.isLength('3');
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_ismapvalue"></a>`_.isMap(value)`
|
|
<a href="#_ismapvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11107 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.ismap "See the npm package")
|
|
|
|
Checks if `value` is classified as a `Map` object.
|
|
|
|
#### Since
|
|
4.3.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isMap(new Map);
|
|
// => true
|
|
|
|
_.isMap(new WeakMap);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_ismatchobject-source"></a>`_.isMatch(object, source)`
|
|
<a href="#_ismatchobject-source">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11135 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.ismatch "See the npm package")
|
|
|
|
Performs a partial deep comparison between `object` and `source` to
|
|
determine if `object` contains equivalent property values. This method is
|
|
equivalent to a `_.matches` function when `source` is partially applied.
|
|
<br>
|
|
<br>
|
|
**Note:** This method supports comparing the same values as `_.isEqual`.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to inspect.
|
|
2. `source` *(Object)*: The object of property values to match.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `object` is a match, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'user': 'fred', 'age': 40 };
|
|
|
|
_.isMatch(object, { 'age': 40 });
|
|
// => true
|
|
|
|
_.isMatch(object, { 'age': 36 });
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_ismatchwithobject-source-customizer"></a>`_.isMatchWith(object, source, [customizer])`
|
|
<a href="#_ismatchwithobject-source-customizer">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11171 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.ismatchwith "See the npm package")
|
|
|
|
This method is like `_.isMatch` except that it accepts `customizer` which
|
|
is invoked to compare values. If `customizer` returns `undefined`, comparisons
|
|
are handled by the method instead. The `customizer` is invoked with five
|
|
arguments: *(objValue, srcValue, index|key, object, source)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to inspect.
|
|
2. `source` *(Object)*: The object of property values to match.
|
|
3. `[customizer]` *(Function)*: The function to customize comparisons.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `object` is a match, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
function isGreeting(value) {
|
|
return /^h(?:i|ello)$/.test(value);
|
|
}
|
|
|
|
function customizer(objValue, srcValue) {
|
|
if (isGreeting(objValue) && isGreeting(srcValue)) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
var object = { 'greeting': 'hello' };
|
|
var source = { 'greeting': 'hi' };
|
|
|
|
_.isMatchWith(object, source, customizer);
|
|
// => true
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isnanvalue"></a>`_.isNaN(value)`
|
|
<a href="#_isnanvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11204 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isnan "See the npm package")
|
|
|
|
Checks if `value` is `NaN`.
|
|
<br>
|
|
<br>
|
|
**Note:** This method is based on
|
|
[`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as
|
|
global [`isNaN`](https://mdn.io/isNaN) which returns `true` for
|
|
`undefined` and other non-number values.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is `NaN`, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isNaN(NaN);
|
|
// => true
|
|
|
|
_.isNaN(new Number(NaN));
|
|
// => true
|
|
|
|
isNaN(undefined);
|
|
// => true
|
|
|
|
_.isNaN(undefined);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isnativevalue"></a>`_.isNative(value)`
|
|
<a href="#_isnativevalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11237 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isnative "See the npm package")
|
|
|
|
Checks if `value` is a pristine native function.
|
|
<br>
|
|
<br>
|
|
**Note:** This method can't reliably detect native functions in the
|
|
presence of the `core-js` package because `core-js` circumvents this kind
|
|
of detection. Despite multiple requests, the `core-js` maintainer has made
|
|
it clear: any attempt to fix the detection will be obstructed. As a result,
|
|
we're left with little choice but to throw an error. Unfortunately, this
|
|
also affects packages, like [babel-polyfill](https://www.npmjs.com/package/babel-polyfill),
|
|
which rely on `core-js`.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is a native function, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isNative(Array.prototype.push);
|
|
// => true
|
|
|
|
_.isNative(_);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isnilvalue"></a>`_.isNil(value)`
|
|
<a href="#_isnilvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11285 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isnil "See the npm package")
|
|
|
|
Checks if `value` is `null` or `undefined`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is nullish, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isNil(null);
|
|
// => true
|
|
|
|
_.isNil(void 0);
|
|
// => true
|
|
|
|
_.isNil(NaN);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isnullvalue"></a>`_.isNull(value)`
|
|
<a href="#_isnullvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11261 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isnull "See the npm package")
|
|
|
|
Checks if `value` is `null`.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is `null`, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isNull(null);
|
|
// => true
|
|
|
|
_.isNull(void 0);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isnumbervalue"></a>`_.isNumber(value)`
|
|
<a href="#_isnumbervalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11316 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isnumber "See the npm package")
|
|
|
|
Checks if `value` is classified as a `Number` primitive or object.
|
|
<br>
|
|
<br>
|
|
**Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are
|
|
classified as numbers, use the `_.isFinite` method.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isNumber(3);
|
|
// => true
|
|
|
|
_.isNumber(Number.MIN_VALUE);
|
|
// => true
|
|
|
|
_.isNumber(Infinity);
|
|
// => true
|
|
|
|
_.isNumber('3');
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isobjectvalue"></a>`_.isObject(value)`
|
|
<a href="#_isobjectvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11056 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isobject "See the npm package")
|
|
|
|
Checks if `value` is the
|
|
[language type](http://www.ecma-international.org/ecma-262/6.0/#sec-ecmascript-language-types)
|
|
of `Object`. *(e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)*
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is an object, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isObject({});
|
|
// => true
|
|
|
|
_.isObject([1, 2, 3]);
|
|
// => true
|
|
|
|
_.isObject(_.noop);
|
|
// => true
|
|
|
|
_.isObject(null);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isobjectlikevalue"></a>`_.isObjectLike(value)`
|
|
<a href="#_isobjectlikevalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11085 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isobjectlike "See the npm package")
|
|
|
|
Checks if `value` is object-like. A value is object-like if it's not `null`
|
|
and has a `typeof` result of "object".
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is object-like, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isObjectLike({});
|
|
// => true
|
|
|
|
_.isObjectLike([1, 2, 3]);
|
|
// => true
|
|
|
|
_.isObjectLike(_.noop);
|
|
// => false
|
|
|
|
_.isObjectLike(null);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isplainobjectvalue"></a>`_.isPlainObject(value)`
|
|
<a href="#_isplainobjectvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11350 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isplainobject "See the npm package")
|
|
|
|
Checks if `value` is a plain object, that is, an object created by the
|
|
`Object` constructor or one with a `[[Prototype]]` of `null`.
|
|
|
|
#### Since
|
|
0.8.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is a plain object, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
function Foo() {
|
|
this.a = 1;
|
|
}
|
|
|
|
_.isPlainObject(new Foo);
|
|
// => false
|
|
|
|
_.isPlainObject([1, 2, 3]);
|
|
// => false
|
|
|
|
_.isPlainObject({ 'x': 0, 'y': 0 });
|
|
// => true
|
|
|
|
_.isPlainObject(Object.create(null));
|
|
// => true
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isregexpvalue"></a>`_.isRegExp(value)`
|
|
<a href="#_isregexpvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11382 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isregexp "See the npm package")
|
|
|
|
Checks if `value` is classified as a `RegExp` object.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isRegExp(/abc/);
|
|
// => true
|
|
|
|
_.isRegExp('/abc/');
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_issafeintegervalue"></a>`_.isSafeInteger(value)`
|
|
<a href="#_issafeintegervalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11414 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.issafeinteger "See the npm package")
|
|
|
|
Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754
|
|
double precision number which isn't the result of a rounded unsafe integer.
|
|
<br>
|
|
<br>
|
|
**Note:** This method is based on
|
|
[`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger).
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is a safe integer, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isSafeInteger(3);
|
|
// => true
|
|
|
|
_.isSafeInteger(Number.MIN_VALUE);
|
|
// => false
|
|
|
|
_.isSafeInteger(Infinity);
|
|
// => false
|
|
|
|
_.isSafeInteger('3');
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_issetvalue"></a>`_.isSet(value)`
|
|
<a href="#_issetvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11436 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isset "See the npm package")
|
|
|
|
Checks if `value` is classified as a `Set` object.
|
|
|
|
#### Since
|
|
4.3.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isSet(new Set);
|
|
// => true
|
|
|
|
_.isSet(new WeakSet);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isstringvalue"></a>`_.isString(value)`
|
|
<a href="#_isstringvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11458 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isstring "See the npm package")
|
|
|
|
Checks if `value` is classified as a `String` primitive or object.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isString('abc');
|
|
// => true
|
|
|
|
_.isString(1);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_issymbolvalue"></a>`_.isSymbol(value)`
|
|
<a href="#_issymbolvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11481 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.issymbol "See the npm package")
|
|
|
|
Checks if `value` is classified as a `Symbol` primitive or object.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isSymbol(Symbol.iterator);
|
|
// => true
|
|
|
|
_.isSymbol('abc');
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_istypedarrayvalue"></a>`_.isTypedArray(value)`
|
|
<a href="#_istypedarrayvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11504 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.istypedarray "See the npm package")
|
|
|
|
Checks if `value` is classified as a typed array.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isTypedArray(new Uint8Array);
|
|
// => true
|
|
|
|
_.isTypedArray([]);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isundefinedvalue"></a>`_.isUndefined(value)`
|
|
<a href="#_isundefinedvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11526 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isundefined "See the npm package")
|
|
|
|
Checks if `value` is `undefined`.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is `undefined`, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isUndefined(void 0);
|
|
// => true
|
|
|
|
_.isUndefined(null);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isweakmapvalue"></a>`_.isWeakMap(value)`
|
|
<a href="#_isweakmapvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11548 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isweakmap "See the npm package")
|
|
|
|
Checks if `value` is classified as a `WeakMap` object.
|
|
|
|
#### Since
|
|
4.3.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isWeakMap(new WeakMap);
|
|
// => true
|
|
|
|
_.isWeakMap(new Map);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_isweaksetvalue"></a>`_.isWeakSet(value)`
|
|
<a href="#_isweaksetvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11570 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.isweakset "See the npm package")
|
|
|
|
Checks if `value` is classified as a `WeakSet` object.
|
|
|
|
#### Since
|
|
4.3.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is correctly classified, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.isWeakSet(new WeakSet);
|
|
// => true
|
|
|
|
_.isWeakSet(new Set);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_ltvalue-other"></a>`_.lt(value, other)`
|
|
<a href="#_ltvalue-other">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11597 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.lt "See the npm package")
|
|
|
|
Checks if `value` is less than `other`.
|
|
|
|
#### Since
|
|
3.9.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to compare.
|
|
2. `other` *(*)*: The other value to compare.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is less than `other`, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.lt(1, 3);
|
|
// => true
|
|
|
|
_.lt(3, 3);
|
|
// => false
|
|
|
|
_.lt(3, 1);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_ltevalue-other"></a>`_.lte(value, other)`
|
|
<a href="#_ltevalue-other">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11622 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.lte "See the npm package")
|
|
|
|
Checks if `value` is less than or equal to `other`.
|
|
|
|
#### Since
|
|
3.9.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to compare.
|
|
2. `other` *(*)*: The other value to compare.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `value` is less than or equal to `other`, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.lte(1, 3);
|
|
// => true
|
|
|
|
_.lte(3, 3);
|
|
// => true
|
|
|
|
_.lte(3, 1);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_toarrayvalue"></a>`_.toArray(value)`
|
|
<a href="#_toarrayvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11649 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.toarray "See the npm package")
|
|
|
|
Converts `value` to an array.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to convert.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the converted array.
|
|
|
|
#### Example
|
|
```js
|
|
_.toArray({ 'a': 1, 'b': 2 });
|
|
// => [1, 2]
|
|
|
|
_.toArray('abc');
|
|
// => ['a', 'b', 'c']
|
|
|
|
_.toArray(1);
|
|
// => []
|
|
|
|
_.toArray(null);
|
|
// => []
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_tofinitevalue"></a>`_.toFinite(value)`
|
|
<a href="#_tofinitevalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11688 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.tofinite "See the npm package")
|
|
|
|
Converts `value` to a finite number.
|
|
|
|
#### Since
|
|
4.12.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to convert.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the converted number.
|
|
|
|
#### Example
|
|
```js
|
|
_.toFinite(3.2);
|
|
// => 3.2
|
|
|
|
_.toFinite(Number.MIN_VALUE);
|
|
// => 5e-324
|
|
|
|
_.toFinite(Infinity);
|
|
// => 1.7976931348623157e+308
|
|
|
|
_.toFinite('3.2');
|
|
// => 3.2
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_tointegervalue"></a>`_.toInteger(value)`
|
|
<a href="#_tointegervalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11726 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.tointeger "See the npm package")
|
|
|
|
Converts `value` to an integer.
|
|
<br>
|
|
<br>
|
|
**Note:** This method is loosely based on
|
|
[`ToInteger`](http://www.ecma-international.org/ecma-262/6.0/#sec-tointeger).
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to convert.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the converted integer.
|
|
|
|
#### Example
|
|
```js
|
|
_.toInteger(3.2);
|
|
// => 3
|
|
|
|
_.toInteger(Number.MIN_VALUE);
|
|
// => 0
|
|
|
|
_.toInteger(Infinity);
|
|
// => 1.7976931348623157e+308
|
|
|
|
_.toInteger('3.2');
|
|
// => 3
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_tolengthvalue"></a>`_.toLength(value)`
|
|
<a href="#_tolengthvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11760 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.tolength "See the npm package")
|
|
|
|
Converts `value` to an integer suitable for use as the length of an
|
|
array-like object.
|
|
<br>
|
|
<br>
|
|
**Note:** This method is based on
|
|
[`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to convert.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the converted integer.
|
|
|
|
#### Example
|
|
```js
|
|
_.toLength(3.2);
|
|
// => 3
|
|
|
|
_.toLength(Number.MIN_VALUE);
|
|
// => 0
|
|
|
|
_.toLength(Infinity);
|
|
// => 4294967295
|
|
|
|
_.toLength('3.2');
|
|
// => 3
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_tonumbervalue"></a>`_.toNumber(value)`
|
|
<a href="#_tonumbervalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11787 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.tonumber "See the npm package")
|
|
|
|
Converts `value` to a number.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to process.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the number.
|
|
|
|
#### Example
|
|
```js
|
|
_.toNumber(3.2);
|
|
// => 3.2
|
|
|
|
_.toNumber(Number.MIN_VALUE);
|
|
// => 5e-324
|
|
|
|
_.toNumber(Infinity);
|
|
// => Infinity
|
|
|
|
_.toNumber('3.2');
|
|
// => 3.2
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_toplainobjectvalue"></a>`_.toPlainObject(value)`
|
|
<a href="#_toplainobjectvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11832 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.toplainobject "See the npm package")
|
|
|
|
Converts `value` to a plain object flattening inherited enumerable string
|
|
keyed properties of `value` to own properties of the plain object.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to convert.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the converted plain object.
|
|
|
|
#### Example
|
|
```js
|
|
function Foo() {
|
|
this.b = 2;
|
|
}
|
|
|
|
Foo.prototype.c = 3;
|
|
|
|
_.assign({ 'a': 1 }, new Foo);
|
|
// => { 'a': 1, 'b': 2 }
|
|
|
|
_.assign({ 'a': 1 }, _.toPlainObject(new Foo));
|
|
// => { 'a': 1, 'b': 2, 'c': 3 }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_tosafeintegervalue"></a>`_.toSafeInteger(value)`
|
|
<a href="#_tosafeintegervalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11860 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.tosafeinteger "See the npm package")
|
|
|
|
Converts `value` to a safe integer. A safe integer can be compared and
|
|
represented correctly.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to convert.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the converted integer.
|
|
|
|
#### Example
|
|
```js
|
|
_.toSafeInteger(3.2);
|
|
// => 3
|
|
|
|
_.toSafeInteger(Number.MIN_VALUE);
|
|
// => 0
|
|
|
|
_.toSafeInteger(Infinity);
|
|
// => 9007199254740991
|
|
|
|
_.toSafeInteger('3.2');
|
|
// => 3
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_tostringvalue"></a>`_.toString(value)`
|
|
<a href="#_tostringvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11885 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.tostring "See the npm package")
|
|
|
|
Converts `value` to a string. An empty string is returned for `null`
|
|
and `undefined` values. The sign of `-0` is preserved.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to process.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the string.
|
|
|
|
#### Example
|
|
```js
|
|
_.toString(null);
|
|
// => ''
|
|
|
|
_.toString(-0);
|
|
// => '-0'
|
|
|
|
_.toString([1, 2, 3]);
|
|
// => '1,2,3'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
## `“Math” Methods`
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_addaugend-addend"></a>`_.add(augend, addend)`
|
|
<a href="#_addaugend-addend">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15481 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.add "See the npm package")
|
|
|
|
Adds two numbers.
|
|
|
|
#### Since
|
|
3.4.0
|
|
#### Arguments
|
|
1. `augend` *(number)*: The first number in an addition.
|
|
2. `addend` *(number)*: The second number in an addition.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the total.
|
|
|
|
#### Example
|
|
```js
|
|
_.add(6, 4);
|
|
// => 10
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_ceilnumber-precision0"></a>`_.ceil(number, [precision=0])`
|
|
<a href="#_ceilnumber-precision0">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15506 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.ceil "See the npm package")
|
|
|
|
Computes `number` rounded up to `precision`.
|
|
|
|
#### Since
|
|
3.10.0
|
|
#### Arguments
|
|
1. `number` *(number)*: The number to round up.
|
|
2. `[precision=0]` *(number)*: The precision to round up to.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the rounded up number.
|
|
|
|
#### Example
|
|
```js
|
|
_.ceil(4.006);
|
|
// => 5
|
|
|
|
_.ceil(6.004, 2);
|
|
// => 6.01
|
|
|
|
_.ceil(6040, -2);
|
|
// => 6100
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_dividedividend-divisor"></a>`_.divide(dividend, divisor)`
|
|
<a href="#_dividedividend-divisor">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15523 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.divide "See the npm package")
|
|
|
|
Divide two numbers.
|
|
|
|
#### Since
|
|
4.7.0
|
|
#### Arguments
|
|
1. `dividend` *(number)*: The first number in a division.
|
|
2. `divisor` *(number)*: The second number in a division.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the quotient.
|
|
|
|
#### Example
|
|
```js
|
|
_.divide(6, 4);
|
|
// => 1.5
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_floornumber-precision0"></a>`_.floor(number, [precision=0])`
|
|
<a href="#_floornumber-precision0">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15548 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.floor "See the npm package")
|
|
|
|
Computes `number` rounded down to `precision`.
|
|
|
|
#### Since
|
|
3.10.0
|
|
#### Arguments
|
|
1. `number` *(number)*: The number to round down.
|
|
2. `[precision=0]` *(number)*: The precision to round down to.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the rounded down number.
|
|
|
|
#### Example
|
|
```js
|
|
_.floor(4.006);
|
|
// => 4
|
|
|
|
_.floor(0.046, 2);
|
|
// => 0.04
|
|
|
|
_.floor(4060, -2);
|
|
// => 4000
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_maxarray"></a>`_.max(array)`
|
|
<a href="#_maxarray">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15568 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.max "See the npm package")
|
|
|
|
Computes the maximum value of `array`. If `array` is empty or falsey,
|
|
`undefined` is returned.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to iterate over.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the maximum value.
|
|
|
|
#### Example
|
|
```js
|
|
_.max([4, 2, 8, 6]);
|
|
// => 8
|
|
|
|
_.max([]);
|
|
// => undefined
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_maxbyarray-iteratee_identity"></a>`_.maxBy(array, [iteratee=_.identity])`
|
|
<a href="#_maxbyarray-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15598 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.maxby "See the npm package")
|
|
|
|
This method is like `_.max` except that it accepts `iteratee` which is
|
|
invoked for each element in `array` to generate the criterion by which
|
|
the value is ranked. The iteratee is invoked with one argument: *(value)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to iterate over.
|
|
2. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The iteratee invoked per element.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the maximum value.
|
|
|
|
#### Example
|
|
```js
|
|
var objects = [{ 'n': 1 }, { 'n': 2 }];
|
|
|
|
_.maxBy(objects, function(o) { return o.n; });
|
|
// => { 'n': 2 }
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.maxBy(objects, 'n');
|
|
// => { 'n': 2 }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_meanarray"></a>`_.mean(array)`
|
|
<a href="#_meanarray">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15618 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.mean "See the npm package")
|
|
|
|
Computes the mean of the values in `array`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to iterate over.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the mean.
|
|
|
|
#### Example
|
|
```js
|
|
_.mean([4, 2, 8, 6]);
|
|
// => 5
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_meanbyarray-iteratee_identity"></a>`_.meanBy(array, [iteratee=_.identity])`
|
|
<a href="#_meanbyarray-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15646 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.meanby "See the npm package")
|
|
|
|
This method is like `_.mean` except that it accepts `iteratee` which is
|
|
invoked for each element in `array` to generate the value to be averaged.
|
|
The iteratee is invoked with one argument: *(value)*.
|
|
|
|
#### Since
|
|
4.7.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to iterate over.
|
|
2. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The iteratee invoked per element.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the mean.
|
|
|
|
#### Example
|
|
```js
|
|
var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
|
|
|
|
_.meanBy(objects, function(o) { return o.n; });
|
|
// => 5
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.meanBy(objects, 'n');
|
|
// => 5
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_minarray"></a>`_.min(array)`
|
|
<a href="#_minarray">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15668 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.min "See the npm package")
|
|
|
|
Computes the minimum value of `array`. If `array` is empty or falsey,
|
|
`undefined` is returned.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to iterate over.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the minimum value.
|
|
|
|
#### Example
|
|
```js
|
|
_.min([4, 2, 8, 6]);
|
|
// => 2
|
|
|
|
_.min([]);
|
|
// => undefined
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_minbyarray-iteratee_identity"></a>`_.minBy(array, [iteratee=_.identity])`
|
|
<a href="#_minbyarray-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15698 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.minby "See the npm package")
|
|
|
|
This method is like `_.min` except that it accepts `iteratee` which is
|
|
invoked for each element in `array` to generate the criterion by which
|
|
the value is ranked. The iteratee is invoked with one argument: *(value)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to iterate over.
|
|
2. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The iteratee invoked per element.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the minimum value.
|
|
|
|
#### Example
|
|
```js
|
|
var objects = [{ 'n': 1 }, { 'n': 2 }];
|
|
|
|
_.minBy(objects, function(o) { return o.n; });
|
|
// => { 'n': 1 }
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.minBy(objects, 'n');
|
|
// => { 'n': 1 }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_multiplymultiplier-multiplicand"></a>`_.multiply(multiplier, multiplicand)`
|
|
<a href="#_multiplymultiplier-multiplicand">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15719 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.multiply "See the npm package")
|
|
|
|
Multiply two numbers.
|
|
|
|
#### Since
|
|
4.7.0
|
|
#### Arguments
|
|
1. `multiplier` *(number)*: The first number in a multiplication.
|
|
2. `multiplicand` *(number)*: The second number in a multiplication.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the product.
|
|
|
|
#### Example
|
|
```js
|
|
_.multiply(6, 4);
|
|
// => 24
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_roundnumber-precision0"></a>`_.round(number, [precision=0])`
|
|
<a href="#_roundnumber-precision0">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15744 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.round "See the npm package")
|
|
|
|
Computes `number` rounded to `precision`.
|
|
|
|
#### Since
|
|
3.10.0
|
|
#### Arguments
|
|
1. `number` *(number)*: The number to round.
|
|
2. `[precision=0]` *(number)*: The precision to round to.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the rounded number.
|
|
|
|
#### Example
|
|
```js
|
|
_.round(4.006);
|
|
// => 4
|
|
|
|
_.round(4.006, 2);
|
|
// => 4.01
|
|
|
|
_.round(4060, -2);
|
|
// => 4100
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_subtractminuend-subtrahend"></a>`_.subtract(minuend, subtrahend)`
|
|
<a href="#_subtractminuend-subtrahend">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15761 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.subtract "See the npm package")
|
|
|
|
Subtract two numbers.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `minuend` *(number)*: The first number in a subtraction.
|
|
2. `subtrahend` *(number)*: The second number in a subtraction.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the difference.
|
|
|
|
#### Example
|
|
```js
|
|
_.subtract(6, 4);
|
|
// => 2
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_sumarray"></a>`_.sum(array)`
|
|
<a href="#_sumarray">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15779 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.sum "See the npm package")
|
|
|
|
Computes the sum of the values in `array`.
|
|
|
|
#### Since
|
|
3.4.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to iterate over.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the sum.
|
|
|
|
#### Example
|
|
```js
|
|
_.sum([4, 2, 8, 6]);
|
|
// => 20
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_sumbyarray-iteratee_identity"></a>`_.sumBy(array, [iteratee=_.identity])`
|
|
<a href="#_sumbyarray-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15809 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.sumby "See the npm package")
|
|
|
|
This method is like `_.sum` except that it accepts `iteratee` which is
|
|
invoked for each element in `array` to generate the value to be summed.
|
|
The iteratee is invoked with one argument: *(value)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `array` *(Array)*: The array to iterate over.
|
|
2. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The iteratee invoked per element.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the sum.
|
|
|
|
#### Example
|
|
```js
|
|
var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
|
|
|
|
_.sumBy(objects, function(o) { return o.n; });
|
|
// => 20
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.sumBy(objects, 'n');
|
|
// => 20
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
## `“Number” Methods`
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_clampnumber-lower-upper"></a>`_.clamp(number, [lower], upper)`
|
|
<a href="#_clampnumber-lower-upper">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13306 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.clamp "See the npm package")
|
|
|
|
Clamps `number` within the inclusive `lower` and `upper` bounds.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `number` *(number)*: The number to clamp.
|
|
2. `[lower]` *(number)*: The lower bound.
|
|
3. `upper` *(number)*: The upper bound.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the clamped number.
|
|
|
|
#### Example
|
|
```js
|
|
_.clamp(-10, -5, 5);
|
|
// => -5
|
|
|
|
_.clamp(10, -5, 5);
|
|
// => 5
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_inrangenumber-start0-end"></a>`_.inRange(number, [start=0], end)`
|
|
<a href="#_inrangenumber-start0-end">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13360 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.inrange "See the npm package")
|
|
|
|
Checks if `n` is between `start` and up to, but not including, `end`. If
|
|
`end` is not specified, it's set to `start` with `start` then set to `0`.
|
|
If `start` is greater than `end` the params are swapped to support
|
|
negative ranges.
|
|
|
|
#### Since
|
|
3.3.0
|
|
#### Arguments
|
|
1. `number` *(number)*: The number to check.
|
|
2. `[start=0]` *(number)*: The start of the range.
|
|
3. `end` *(number)*: The end of the range.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `number` is in the range, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.inRange(3, 2, 4);
|
|
// => true
|
|
|
|
_.inRange(4, 8);
|
|
// => true
|
|
|
|
_.inRange(4, 2);
|
|
// => false
|
|
|
|
_.inRange(2, 2);
|
|
// => false
|
|
|
|
_.inRange(1.2, 2);
|
|
// => true
|
|
|
|
_.inRange(5.2, 4);
|
|
// => false
|
|
|
|
_.inRange(-3, -2, -6);
|
|
// => true
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_randomlower0-upper1-floating"></a>`_.random([lower=0], [upper=1], [floating])`
|
|
<a href="#_randomlower0-upper1-floating">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13403 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.random "See the npm package")
|
|
|
|
Produces a random number between the inclusive `lower` and `upper` bounds.
|
|
If only one argument is provided a number between `0` and the given number
|
|
is returned. If `floating` is `true`, or either `lower` or `upper` are
|
|
floats, a floating-point number is returned instead of an integer.
|
|
<br>
|
|
<br>
|
|
**Note:** JavaScript follows the IEEE-754 standard for resolving
|
|
floating-point values which can produce unexpected results.
|
|
|
|
#### Since
|
|
0.7.0
|
|
#### Arguments
|
|
1. `[lower=0]` *(number)*: The lower bound.
|
|
2. `[upper=1]` *(number)*: The upper bound.
|
|
3. `[floating]` *(boolean)*: Specify returning a floating-point number.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the random number.
|
|
|
|
#### Example
|
|
```js
|
|
_.random(0, 5);
|
|
// => an integer between 0 and 5
|
|
|
|
_.random(5);
|
|
// => also an integer between 0 and 5
|
|
|
|
_.random(5, true);
|
|
// => a floating-point number between 0 and 5
|
|
|
|
_.random(1.2, 5.2);
|
|
// => a floating-point number between 1.2 and 5.2
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
## `“Object” Methods`
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_assignobject-sources"></a>`_.assign(object, [sources])`
|
|
<a href="#_assignobject-sources">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11923 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.assign "See the npm package")
|
|
|
|
Assigns own enumerable string keyed properties of source objects to the
|
|
destination object. Source objects are applied from left to right.
|
|
Subsequent sources overwrite property assignments of previous sources.
|
|
<br>
|
|
<br>
|
|
**Note:** This method mutates `object` and is loosely based on
|
|
[`Object.assign`](https://mdn.io/Object/assign).
|
|
|
|
#### Since
|
|
0.10.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The destination object.
|
|
2. `[sources]` *(...Object)*: The source objects.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns `object`.
|
|
|
|
#### Example
|
|
```js
|
|
function Foo() {
|
|
this.c = 3;
|
|
}
|
|
|
|
function Bar() {
|
|
this.e = 5;
|
|
}
|
|
|
|
Foo.prototype.d = 4;
|
|
Bar.prototype.f = 6;
|
|
|
|
_.assign({ 'a': 1 }, new Foo, new Bar);
|
|
// => { 'a': 1, 'c': 3, 'e': 5 }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_assigninobject-sources"></a>`_.assignIn(object, [sources])`
|
|
<a href="#_assigninobject-sources">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L11966 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.assignin "See the npm package")
|
|
|
|
This method is like `_.assign` except that it iterates over own and
|
|
inherited source properties.
|
|
<br>
|
|
<br>
|
|
**Note:** This method mutates `object`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Aliases
|
|
*_.extend*
|
|
|
|
#### Arguments
|
|
1. `object` *(Object)*: The destination object.
|
|
2. `[sources]` *(...Object)*: The source objects.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns `object`.
|
|
|
|
#### Example
|
|
```js
|
|
function Foo() {
|
|
this.b = 2;
|
|
}
|
|
|
|
function Bar() {
|
|
this.d = 4;
|
|
}
|
|
|
|
Foo.prototype.c = 3;
|
|
Bar.prototype.e = 5;
|
|
|
|
_.assignIn({ 'a': 1 }, new Foo, new Bar);
|
|
// => { 'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5 }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_assigninwithobject-sources-customizer"></a>`_.assignInWith(object, sources, [customizer])`
|
|
<a href="#_assigninwithobject-sources-customizer">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12005 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.assigninwith "See the npm package")
|
|
|
|
This method is like `_.assignIn` except that it accepts `customizer`
|
|
which is invoked to produce the assigned values. If `customizer` returns
|
|
`undefined`, assignment is handled by the method instead. The `customizer`
|
|
is invoked with five arguments: *(objValue, srcValue, key, object, source)*.
|
|
<br>
|
|
<br>
|
|
**Note:** This method mutates `object`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Aliases
|
|
*_.extendWith*
|
|
|
|
#### Arguments
|
|
1. `object` *(Object)*: The destination object.
|
|
2. `sources` *(...Object)*: The source objects.
|
|
3. `[customizer]` *(Function)*: The function to customize assigned values.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns `object`.
|
|
|
|
#### Example
|
|
```js
|
|
function customizer(objValue, srcValue) {
|
|
return _.isUndefined(objValue) ? srcValue : objValue;
|
|
}
|
|
|
|
var defaults = _.partialRight(_.assignInWith, customizer);
|
|
|
|
defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
|
|
// => { 'a': 1, 'b': 2 }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_assignwithobject-sources-customizer"></a>`_.assignWith(object, sources, [customizer])`
|
|
<a href="#_assignwithobject-sources-customizer">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12037 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.assignwith "See the npm package")
|
|
|
|
This method is like `_.assign` except that it accepts `customizer`
|
|
which is invoked to produce the assigned values. If `customizer` returns
|
|
`undefined`, assignment is handled by the method instead. The `customizer`
|
|
is invoked with five arguments: *(objValue, srcValue, key, object, source)*.
|
|
<br>
|
|
<br>
|
|
**Note:** This method mutates `object`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The destination object.
|
|
2. `sources` *(...Object)*: The source objects.
|
|
3. `[customizer]` *(Function)*: The function to customize assigned values.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns `object`.
|
|
|
|
#### Example
|
|
```js
|
|
function customizer(objValue, srcValue) {
|
|
return _.isUndefined(objValue) ? srcValue : objValue;
|
|
}
|
|
|
|
var defaults = _.partialRight(_.assignWith, customizer);
|
|
|
|
defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
|
|
// => { 'a': 1, 'b': 2 }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_atobject-paths"></a>`_.at(object, [paths])`
|
|
<a href="#_atobject-paths">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12058 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.at "See the npm package")
|
|
|
|
Creates an array of values corresponding to `paths` of `object`.
|
|
|
|
#### Since
|
|
1.0.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to iterate over.
|
|
2. `[paths]` *(...(string|string[]))*: The property paths of elements to pick.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the picked values.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
|
|
|
|
_.at(object, ['a[0].b.c', 'a[1]']);
|
|
// => [3, 4]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_createprototype-properties"></a>`_.create(prototype, [properties])`
|
|
<a href="#_createprototype-properties">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12096 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.create "See the npm package")
|
|
|
|
Creates an object that inherits from the `prototype` object. If a
|
|
`properties` object is given, its own enumerable string keyed properties
|
|
are assigned to the created object.
|
|
|
|
#### Since
|
|
2.3.0
|
|
#### Arguments
|
|
1. `prototype` *(Object)*: The object to inherit from.
|
|
2. `[properties]` *(Object)*: The properties to assign to the object.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the new object.
|
|
|
|
#### Example
|
|
```js
|
|
function Shape() {
|
|
this.x = 0;
|
|
this.y = 0;
|
|
}
|
|
|
|
function Circle() {
|
|
Shape.call(this);
|
|
}
|
|
|
|
Circle.prototype = _.create(Shape.prototype, {
|
|
'constructor': Circle
|
|
});
|
|
|
|
var circle = new Circle;
|
|
circle instanceof Circle;
|
|
// => true
|
|
|
|
circle instanceof Shape;
|
|
// => true
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_defaultsobject-sources"></a>`_.defaults(object, [sources])`
|
|
<a href="#_defaultsobject-sources">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12122 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.defaults "See the npm package")
|
|
|
|
Assigns own and inherited enumerable string keyed properties of source
|
|
objects to the destination object for all destination properties that
|
|
resolve to `undefined`. Source objects are applied from left to right.
|
|
Once a property is set, additional values of the same property are ignored.
|
|
<br>
|
|
<br>
|
|
**Note:** This method mutates `object`.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The destination object.
|
|
2. `[sources]` *(...Object)*: The source objects.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns `object`.
|
|
|
|
#### Example
|
|
```js
|
|
_.defaults({ 'user': 'barney' }, { 'age': 36 }, { 'user': 'fred' });
|
|
// => { 'user': 'barney', 'age': 36 }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_defaultsdeepobject-sources"></a>`_.defaultsDeep(object, [sources])`
|
|
<a href="#_defaultsdeepobject-sources">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12147 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.defaultsdeep "See the npm package")
|
|
|
|
This method is like `_.defaults` except that it recursively assigns
|
|
default properties.
|
|
<br>
|
|
<br>
|
|
**Note:** This method mutates `object`.
|
|
|
|
#### Since
|
|
3.10.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The destination object.
|
|
2. `[sources]` *(...Object)*: The source objects.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns `object`.
|
|
|
|
#### Example
|
|
```js
|
|
_.defaultsDeep({ 'user': { 'name': 'barney' } }, { 'user': { 'name': 'fred', 'age': 36 } });
|
|
// => { 'user': { 'name': 'barney', 'age': 36 } }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_findkeyobject-predicate_identity"></a>`_.findKey(object, [predicate=_.identity])`
|
|
<a href="#_findkeyobject-predicate_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12188 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.findkey "See the npm package")
|
|
|
|
This method is like `_.find` except that it returns the key of the first
|
|
element `predicate` returns truthy for instead of the element itself.
|
|
|
|
#### Since
|
|
1.1.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to search.
|
|
2. `[predicate=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the key of the matched element, else `undefined`.
|
|
|
|
#### Example
|
|
```js
|
|
var users = {
|
|
'barney': { 'age': 36, 'active': true },
|
|
'fred': { 'age': 40, 'active': false },
|
|
'pebbles': { 'age': 1, 'active': true }
|
|
};
|
|
|
|
_.findKey(users, function(o) { return o.age < 40; });
|
|
// => 'barney' (iteration order is not guaranteed)
|
|
|
|
// The `_.matches` iteratee shorthand.
|
|
_.findKey(users, { 'age': 1, 'active': true });
|
|
// => 'pebbles'
|
|
|
|
// The `_.matchesProperty` iteratee shorthand.
|
|
_.findKey(users, ['active', false]);
|
|
// => 'fred'
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.findKey(users, 'active');
|
|
// => 'barney'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_findlastkeyobject-predicate_identity"></a>`_.findLastKey(object, [predicate=_.identity])`
|
|
<a href="#_findlastkeyobject-predicate_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12228 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.findlastkey "See the npm package")
|
|
|
|
This method is like `_.findKey` except that it iterates over elements of
|
|
a collection in the opposite order.
|
|
|
|
#### Since
|
|
2.0.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to search.
|
|
2. `[predicate=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the key of the matched element, else `undefined`.
|
|
|
|
#### Example
|
|
```js
|
|
var users = {
|
|
'barney': { 'age': 36, 'active': true },
|
|
'fred': { 'age': 40, 'active': false },
|
|
'pebbles': { 'age': 1, 'active': true }
|
|
};
|
|
|
|
_.findLastKey(users, function(o) { return o.age < 40; });
|
|
// => returns 'pebbles' assuming `_.findKey` returns 'barney'
|
|
|
|
// The `_.matches` iteratee shorthand.
|
|
_.findLastKey(users, { 'age': 36, 'active': true });
|
|
// => 'barney'
|
|
|
|
// The `_.matchesProperty` iteratee shorthand.
|
|
_.findLastKey(users, ['active', false]);
|
|
// => 'fred'
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.findLastKey(users, 'active');
|
|
// => 'pebbles'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_forinobject-iteratee_identity"></a>`_.forIn(object, [iteratee=_.identity])`
|
|
<a href="#_forinobject-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12260 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.forin "See the npm package")
|
|
|
|
Iterates over own and inherited enumerable string keyed properties of an
|
|
object and invokes `iteratee` for each property. The iteratee is invoked
|
|
with three arguments: *(value, key, object)*. Iteratee functions may exit
|
|
iteration early by explicitly returning `false`.
|
|
|
|
#### Since
|
|
0.3.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to iterate over.
|
|
2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns `object`.
|
|
|
|
#### Example
|
|
```js
|
|
function Foo() {
|
|
this.a = 1;
|
|
this.b = 2;
|
|
}
|
|
|
|
Foo.prototype.c = 3;
|
|
|
|
_.forIn(new Foo, function(value, key) {
|
|
console.log(key);
|
|
});
|
|
// => Logs 'a', 'b', then 'c' (iteration order is not guaranteed).
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_forinrightobject-iteratee_identity"></a>`_.forInRight(object, [iteratee=_.identity])`
|
|
<a href="#_forinrightobject-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12292 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.forinright "See the npm package")
|
|
|
|
This method is like `_.forIn` except that it iterates over properties of
|
|
`object` in the opposite order.
|
|
|
|
#### Since
|
|
2.0.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to iterate over.
|
|
2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns `object`.
|
|
|
|
#### Example
|
|
```js
|
|
function Foo() {
|
|
this.a = 1;
|
|
this.b = 2;
|
|
}
|
|
|
|
Foo.prototype.c = 3;
|
|
|
|
_.forInRight(new Foo, function(value, key) {
|
|
console.log(key);
|
|
});
|
|
// => Logs 'c', 'b', then 'a' assuming `_.forIn` logs 'a', 'b', then 'c'.
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_forownobject-iteratee_identity"></a>`_.forOwn(object, [iteratee=_.identity])`
|
|
<a href="#_forownobject-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12326 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.forown "See the npm package")
|
|
|
|
Iterates over own enumerable string keyed properties of an object and
|
|
invokes `iteratee` for each property. The iteratee is invoked with three
|
|
arguments: *(value, key, object)*. Iteratee functions may exit iteration
|
|
early by explicitly returning `false`.
|
|
|
|
#### Since
|
|
0.3.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to iterate over.
|
|
2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns `object`.
|
|
|
|
#### Example
|
|
```js
|
|
function Foo() {
|
|
this.a = 1;
|
|
this.b = 2;
|
|
}
|
|
|
|
Foo.prototype.c = 3;
|
|
|
|
_.forOwn(new Foo, function(value, key) {
|
|
console.log(key);
|
|
});
|
|
// => Logs 'a' then 'b' (iteration order is not guaranteed).
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_forownrightobject-iteratee_identity"></a>`_.forOwnRight(object, [iteratee=_.identity])`
|
|
<a href="#_forownrightobject-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12356 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.forownright "See the npm package")
|
|
|
|
This method is like `_.forOwn` except that it iterates over properties of
|
|
`object` in the opposite order.
|
|
|
|
#### Since
|
|
2.0.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to iterate over.
|
|
2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns `object`.
|
|
|
|
#### Example
|
|
```js
|
|
function Foo() {
|
|
this.a = 1;
|
|
this.b = 2;
|
|
}
|
|
|
|
Foo.prototype.c = 3;
|
|
|
|
_.forOwnRight(new Foo, function(value, key) {
|
|
console.log(key);
|
|
});
|
|
// => Logs 'b' then 'a' assuming `_.forOwn` logs 'a' then 'b'.
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_functionsobject"></a>`_.functions(object)`
|
|
<a href="#_functionsobject">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12383 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.functions "See the npm package")
|
|
|
|
Creates an array of function property names from own enumerable properties
|
|
of `object`.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to inspect.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the function names.
|
|
|
|
#### Example
|
|
```js
|
|
function Foo() {
|
|
this.a = _.constant('a');
|
|
this.b = _.constant('b');
|
|
}
|
|
|
|
Foo.prototype.c = _.constant('c');
|
|
|
|
_.functions(new Foo);
|
|
// => ['a', 'b']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_functionsinobject"></a>`_.functionsIn(object)`
|
|
<a href="#_functionsinobject">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12410 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.functionsin "See the npm package")
|
|
|
|
Creates an array of function property names from own and inherited
|
|
enumerable properties of `object`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to inspect.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the function names.
|
|
|
|
#### Example
|
|
```js
|
|
function Foo() {
|
|
this.a = _.constant('a');
|
|
this.b = _.constant('b');
|
|
}
|
|
|
|
Foo.prototype.c = _.constant('c');
|
|
|
|
_.functionsIn(new Foo);
|
|
// => ['a', 'b', 'c']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_getobject-path-defaultvalue"></a>`_.get(object, path, [defaultValue])`
|
|
<a href="#_getobject-path-defaultvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12439 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.get "See the npm package")
|
|
|
|
Gets the value at `path` of `object`. If the resolved value is
|
|
`undefined`, the `defaultValue` is used in its place.
|
|
|
|
#### Since
|
|
3.7.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to query.
|
|
2. `path` *(Array|string)*: The path of the property to get.
|
|
3. `[defaultValue]` *(*)*: The value returned for `undefined` resolved values.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the resolved value.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'a': [{ 'b': { 'c': 3 } }] };
|
|
|
|
_.get(object, 'a[0].b.c');
|
|
// => 3
|
|
|
|
_.get(object, ['a', '0', 'b', 'c']);
|
|
// => 3
|
|
|
|
_.get(object, 'a.b.c', 'default');
|
|
// => 'default'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_hasobject-path"></a>`_.has(object, path)`
|
|
<a href="#_hasobject-path">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12471 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.has "See the npm package")
|
|
|
|
Checks if `path` is a direct property of `object`.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to query.
|
|
2. `path` *(Array|string)*: The path to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `path` exists, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'a': { 'b': 2 } };
|
|
var other = _.create({ 'a': _.create({ 'b': 2 }) });
|
|
|
|
_.has(object, 'a');
|
|
// => true
|
|
|
|
_.has(object, 'a.b');
|
|
// => true
|
|
|
|
_.has(object, ['a', 'b']);
|
|
// => true
|
|
|
|
_.has(other, 'a');
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_hasinobject-path"></a>`_.hasIn(object, path)`
|
|
<a href="#_hasinobject-path">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12501 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.hasin "See the npm package")
|
|
|
|
Checks if `path` is a direct or inherited property of `object`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to query.
|
|
2. `path` *(Array|string)*: The path to check.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `path` exists, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
var object = _.create({ 'a': _.create({ 'b': 2 }) });
|
|
|
|
_.hasIn(object, 'a');
|
|
// => true
|
|
|
|
_.hasIn(object, 'a.b');
|
|
// => true
|
|
|
|
_.hasIn(object, ['a', 'b']);
|
|
// => true
|
|
|
|
_.hasIn(object, 'b');
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_invertobject"></a>`_.invert(object)`
|
|
<a href="#_invertobject">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12523 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.invert "See the npm package")
|
|
|
|
Creates an object composed of the inverted keys and values of `object`.
|
|
If `object` contains duplicate values, subsequent values overwrite
|
|
property assignments of previous values.
|
|
|
|
#### Since
|
|
0.7.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to invert.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the new inverted object.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'a': 1, 'b': 2, 'c': 1 };
|
|
|
|
_.invert(object);
|
|
// => { '1': 'c', '2': 'b' }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_invertbyobject-iteratee_identity"></a>`_.invertBy(object, [iteratee=_.identity])`
|
|
<a href="#_invertbyobject-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12554 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.invertby "See the npm package")
|
|
|
|
This method is like `_.invert` except that the inverted object is generated
|
|
from the results of running each element of `object` thru `iteratee`. The
|
|
corresponding inverted value of each inverted key is an array of keys
|
|
responsible for generating the inverted value. The iteratee is invoked
|
|
with one argument: *(value)*.
|
|
|
|
#### Since
|
|
4.1.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to invert.
|
|
2. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The iteratee invoked per element.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the new inverted object.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'a': 1, 'b': 2, 'c': 1 };
|
|
|
|
_.invertBy(object);
|
|
// => { '1': ['a', 'c'], '2': ['b'] }
|
|
|
|
_.invertBy(object, function(value) {
|
|
return 'group' + value;
|
|
});
|
|
// => { 'group1': ['a', 'c'], 'group2': ['b'] }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_invokeobject-path-args"></a>`_.invoke(object, path, [args])`
|
|
<a href="#_invokeobject-path-args">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12580 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.invoke "See the npm package")
|
|
|
|
Invokes the method at `path` of `object`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to query.
|
|
2. `path` *(Array|string)*: The path of the method to invoke.
|
|
3. `[args]` *(...*)*: The arguments to invoke the method with.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the result of the invoked method.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'a': [{ 'b': { 'c': [1, 2, 3, 4] } }] };
|
|
|
|
_.invoke(object, 'a[0].b.c.slice', 1, 3);
|
|
// => [2, 3]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_keysobject"></a>`_.keys(object)`
|
|
<a href="#_keysobject">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12610 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.keys "See the npm package")
|
|
|
|
Creates an array of the own enumerable property names of `object`.
|
|
<br>
|
|
<br>
|
|
**Note:** Non-object values are coerced to objects. See the
|
|
[ES spec](http://ecma-international.org/ecma-262/6.0/#sec-object.keys)
|
|
for more details.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to query.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the array of property names.
|
|
|
|
#### Example
|
|
```js
|
|
function Foo() {
|
|
this.a = 1;
|
|
this.b = 2;
|
|
}
|
|
|
|
Foo.prototype.c = 3;
|
|
|
|
_.keys(new Foo);
|
|
// => ['a', 'b'] (iteration order is not guaranteed)
|
|
|
|
_.keys('hi');
|
|
// => ['0', '1']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_keysinobject"></a>`_.keysIn(object)`
|
|
<a href="#_keysinobject">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12653 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.keysin "See the npm package")
|
|
|
|
Creates an array of the own and inherited enumerable property names of `object`.
|
|
<br>
|
|
<br>
|
|
**Note:** Non-object values are coerced to objects.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to query.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the array of property names.
|
|
|
|
#### Example
|
|
```js
|
|
function Foo() {
|
|
this.a = 1;
|
|
this.b = 2;
|
|
}
|
|
|
|
Foo.prototype.c = 3;
|
|
|
|
_.keysIn(new Foo);
|
|
// => ['a', 'b', 'c'] (iteration order is not guaranteed)
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_mapkeysobject-iteratee_identity"></a>`_.mapKeys(object, [iteratee=_.identity])`
|
|
<a href="#_mapkeysobject-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12695 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.mapkeys "See the npm package")
|
|
|
|
The opposite of `_.mapValues`; this method creates an object with the
|
|
same values as `object` and keys generated by running each own enumerable
|
|
string keyed property of `object` thru `iteratee`. The iteratee is invoked
|
|
with three arguments: *(value, key, object)*.
|
|
|
|
#### Since
|
|
3.8.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to iterate over.
|
|
2. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the new mapped object.
|
|
|
|
#### Example
|
|
```js
|
|
_.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) {
|
|
return key + value;
|
|
});
|
|
// => { 'a1': 1, 'b2': 2 }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_mapvaluesobject-iteratee_identity"></a>`_.mapValues(object, [iteratee=_.identity])`
|
|
<a href="#_mapvaluesobject-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12734 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.mapvalues "See the npm package")
|
|
|
|
Creates an object with the same keys as `object` and values generated
|
|
by running each own enumerable string keyed property of `object` thru
|
|
`iteratee`. The iteratee is invoked with three arguments:<br>
|
|
*(value, key, object)*.
|
|
|
|
#### Since
|
|
2.4.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to iterate over.
|
|
2. `[iteratee=_.identity]` *(Array|Function|Object|string)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the new mapped object.
|
|
|
|
#### Example
|
|
```js
|
|
var users = {
|
|
'fred': { 'user': 'fred', 'age': 40 },
|
|
'pebbles': { 'user': 'pebbles', 'age': 1 }
|
|
};
|
|
|
|
_.mapValues(users, function(o) { return o.age; });
|
|
// => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.mapValues(users, 'age');
|
|
// => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_mergeobject-sources"></a>`_.merge(object, [sources])`
|
|
<a href="#_mergeobject-sources">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12775 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.merge "See the npm package")
|
|
|
|
This method is like `_.assign` except that it recursively merges own and
|
|
inherited enumerable string keyed properties of source objects into the
|
|
destination object. Source properties that resolve to `undefined` are
|
|
skipped if a destination value exists. Array and plain object properties
|
|
are merged recursively. Other objects and value types are overridden by
|
|
assignment. Source objects are applied from left to right. Subsequent
|
|
sources overwrite property assignments of previous sources.
|
|
<br>
|
|
<br>
|
|
**Note:** This method mutates `object`.
|
|
|
|
#### Since
|
|
0.5.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The destination object.
|
|
2. `[sources]` *(...Object)*: The source objects.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns `object`.
|
|
|
|
#### Example
|
|
```js
|
|
var users = {
|
|
'data': [{ 'user': 'barney' }, { 'user': 'fred' }]
|
|
};
|
|
|
|
var ages = {
|
|
'data': [{ 'age': 36 }, { 'age': 40 }]
|
|
};
|
|
|
|
_.merge(users, ages);
|
|
// => { 'data': [{ 'user': 'barney', 'age': 36 }, { 'user': 'fred', 'age': 40 }] }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_mergewithobject-sources-customizer"></a>`_.mergeWith(object, sources, customizer)`
|
|
<a href="#_mergewithobject-sources-customizer">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12817 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.mergewith "See the npm package")
|
|
|
|
This method is like `_.merge` except that it accepts `customizer` which
|
|
is invoked to produce the merged values of the destination and source
|
|
properties. If `customizer` returns `undefined`, merging is handled by the
|
|
method instead. The `customizer` is invoked with seven arguments:<br>
|
|
*(objValue, srcValue, key, object, source, stack)*.
|
|
<br>
|
|
<br>
|
|
**Note:** This method mutates `object`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The destination object.
|
|
2. `sources` *(...Object)*: The source objects.
|
|
3. `customizer` *(Function)*: The function to customize assigned values.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns `object`.
|
|
|
|
#### Example
|
|
```js
|
|
function customizer(objValue, srcValue) {
|
|
if (_.isArray(objValue)) {
|
|
return objValue.concat(srcValue);
|
|
}
|
|
}
|
|
|
|
var object = {
|
|
'fruits': ['apple'],
|
|
'vegetables': ['beet']
|
|
};
|
|
|
|
var other = {
|
|
'fruits': ['banana'],
|
|
'vegetables': ['carrot']
|
|
};
|
|
|
|
_.mergeWith(object, other, customizer);
|
|
// => { 'fruits': ['apple', 'banana'], 'vegetables': ['beet', 'carrot'] }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_omitobject-props"></a>`_.omit(object, [props])`
|
|
<a href="#_omitobject-props">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12840 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.omit "See the npm package")
|
|
|
|
The opposite of `_.pick`; this method creates an object composed of the
|
|
own and inherited enumerable string keyed properties of `object` that are
|
|
not omitted.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The source object.
|
|
2. `[props]` *(...(string|string[]))*: The property identifiers to omit.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the new object.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'a': 1, 'b': '2', 'c': 3 };
|
|
|
|
_.omit(object, ['a', 'c']);
|
|
// => { 'b': '2' }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_omitbyobject-predicate_identity"></a>`_.omitBy(object, [predicate=_.identity])`
|
|
<a href="#_omitbyobject-predicate_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12869 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.omitby "See the npm package")
|
|
|
|
The opposite of `_.pickBy`; this method creates an object composed of
|
|
the own and inherited enumerable string keyed properties of `object` that
|
|
`predicate` doesn't return truthy for. The predicate is invoked with two
|
|
arguments: *(value, key)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The source object.
|
|
2. `[predicate=_.identity]` *(Array|Function|Object|string)*: The function invoked per property.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the new object.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'a': 1, 'b': '2', 'c': 3 };
|
|
|
|
_.omitBy(object, _.isNumber);
|
|
// => { 'b': '2' }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_pickobject-props"></a>`_.pick(object, [props])`
|
|
<a href="#_pickobject-props">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12893 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.pick "See the npm package")
|
|
|
|
Creates an object composed of the picked `object` properties.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The source object.
|
|
2. `[props]` *(...(string|string[]))*: The property identifiers to pick.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the new object.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'a': 1, 'b': '2', 'c': 3 };
|
|
|
|
_.pick(object, ['a', 'c']);
|
|
// => { 'a': 1, 'c': 3 }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_pickbyobject-predicate_identity"></a>`_.pickBy(object, [predicate=_.identity])`
|
|
<a href="#_pickbyobject-predicate_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12916 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.pickby "See the npm package")
|
|
|
|
Creates an object composed of the `object` properties `predicate` returns
|
|
truthy for. The predicate is invoked with two arguments: *(value, key)*.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The source object.
|
|
2. `[predicate=_.identity]` *(Array|Function|Object|string)*: The function invoked per property.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the new object.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'a': 1, 'b': '2', 'c': 3 };
|
|
|
|
_.pickBy(object, _.isNumber);
|
|
// => { 'a': 1, 'c': 3 }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_resultobject-path-defaultvalue"></a>`_.result(object, path, [defaultValue])`
|
|
<a href="#_resultobject-path-defaultvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12949 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.result "See the npm package")
|
|
|
|
This method is like `_.get` except that if the resolved value is a
|
|
function it's invoked with the `this` binding of its parent object and
|
|
its result is returned.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to query.
|
|
2. `path` *(Array|string)*: The path of the property to resolve.
|
|
3. `[defaultValue]` *(*)*: The value returned for `undefined` resolved values.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the resolved value.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] };
|
|
|
|
_.result(object, 'a[0].b.c1');
|
|
// => 3
|
|
|
|
_.result(object, 'a[0].b.c2');
|
|
// => 4
|
|
|
|
_.result(object, 'a[0].b.c3', 'default');
|
|
// => 'default'
|
|
|
|
_.result(object, 'a[0].b.c3', _.constant('default'));
|
|
// => 'default'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_setobject-path-value"></a>`_.set(object, path, value)`
|
|
<a href="#_setobject-path-value">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L12999 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.set "See the npm package")
|
|
|
|
Sets the value at `path` of `object`. If a portion of `path` doesn't exist,
|
|
it's created. Arrays are created for missing index properties while objects
|
|
are created for all other missing properties. Use `_.setWith` to customize
|
|
`path` creation.
|
|
<br>
|
|
<br>
|
|
**Note:** This method mutates `object`.
|
|
|
|
#### Since
|
|
3.7.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to modify.
|
|
2. `path` *(Array|string)*: The path of the property to set.
|
|
3. `value` *(*)*: The value to set.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns `object`.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'a': [{ 'b': { 'c': 3 } }] };
|
|
|
|
_.set(object, 'a[0].b.c', 4);
|
|
console.log(object.a[0].b.c);
|
|
// => 4
|
|
|
|
_.set(object, ['x', '0', 'y', 'z'], 5);
|
|
console.log(object.x[0].y.z);
|
|
// => 5
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_setwithobject-path-value-customizer"></a>`_.setWith(object, path, value, [customizer])`
|
|
<a href="#_setwithobject-path-value-customizer">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13027 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.setwith "See the npm package")
|
|
|
|
This method is like `_.set` except that it accepts `customizer` which is
|
|
invoked to produce the objects of `path`. If `customizer` returns `undefined`
|
|
path creation is handled by the method instead. The `customizer` is invoked
|
|
with three arguments: *(nsValue, key, nsObject)*.
|
|
<br>
|
|
<br>
|
|
**Note:** This method mutates `object`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to modify.
|
|
2. `path` *(Array|string)*: The path of the property to set.
|
|
3. `value` *(*)*: The value to set.
|
|
4. `[customizer]` *(Function)*: The function to customize assigned values.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns `object`.
|
|
|
|
#### Example
|
|
```js
|
|
var object = {};
|
|
|
|
_.setWith(object, '[0][1]', 'a', Object);
|
|
// => { '0': { '1': 'a' } }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_topairsobject"></a>`_.toPairs(object)`
|
|
<a href="#_topairsobject">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13056 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.topairs "See the npm package")
|
|
|
|
Creates an array of own enumerable string keyed-value pairs for `object`
|
|
which can be consumed by `_.fromPairs`. If `object` is a map or set, its
|
|
entries are returned.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Aliases
|
|
*_.entries*
|
|
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to query.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the key-value pairs.
|
|
|
|
#### Example
|
|
```js
|
|
function Foo() {
|
|
this.a = 1;
|
|
this.b = 2;
|
|
}
|
|
|
|
Foo.prototype.c = 3;
|
|
|
|
_.toPairs(new Foo);
|
|
// => [['a', 1], ['b', 2]] (iteration order is not guaranteed)
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_topairsinobject"></a>`_.toPairsIn(object)`
|
|
<a href="#_topairsinobject">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13082 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.topairsin "See the npm package")
|
|
|
|
Creates an array of own and inherited enumerable string keyed-value pairs
|
|
for `object` which can be consumed by `_.fromPairs`. If `object` is a map
|
|
or set, its entries are returned.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Aliases
|
|
*_.entriesIn*
|
|
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to query.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the key-value pairs.
|
|
|
|
#### Example
|
|
```js
|
|
function Foo() {
|
|
this.a = 1;
|
|
this.b = 2;
|
|
}
|
|
|
|
Foo.prototype.c = 3;
|
|
|
|
_.toPairsIn(new Foo);
|
|
// => [['a', 1], ['b', 2], ['c', 3]] (iteration order is not guaranteed)
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_transformobject-iteratee_identity-accumulator"></a>`_.transform(object, [iteratee=_.identity], [accumulator])`
|
|
<a href="#_transformobject-iteratee_identity-accumulator">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13114 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.transform "See the npm package")
|
|
|
|
An alternative to `_.reduce`; this method transforms `object` to a new
|
|
`accumulator` object which is the result of running each of its own
|
|
enumerable string keyed properties thru `iteratee`, with each invocation
|
|
potentially mutating the `accumulator` object. If `accumulator` is not
|
|
provided, a new object with the same `[[Prototype]]` will be used. The
|
|
iteratee is invoked with four arguments: *(accumulator, value, key, object)*.
|
|
Iteratee functions may exit iteration early by explicitly returning `false`.
|
|
|
|
#### Since
|
|
1.3.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to iterate over.
|
|
2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration.
|
|
3. `[accumulator]` *(*)*: The custom accumulator value.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the accumulated value.
|
|
|
|
#### Example
|
|
```js
|
|
_.transform([2, 3, 4], function(result, n) {
|
|
result.push(n *= n);
|
|
return n % 2 == 0;
|
|
}, []);
|
|
// => [4, 9]
|
|
|
|
_.transform({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
|
|
(result[value] || (result[value] = [])).push(key);
|
|
}, {});
|
|
// => { '1': ['a', 'c'], '2': ['b'] }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_unsetobject-path"></a>`_.unset(object, path)`
|
|
<a href="#_unsetobject-path">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13163 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.unset "See the npm package")
|
|
|
|
Removes the property at `path` of `object`.
|
|
<br>
|
|
<br>
|
|
**Note:** This method mutates `object`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to modify.
|
|
2. `path` *(Array|string)*: The path of the property to unset.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if the property is deleted, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'a': [{ 'b': { 'c': 7 } }] };
|
|
_.unset(object, 'a[0].b.c');
|
|
// => true
|
|
|
|
console.log(object);
|
|
// => { 'a': [{ 'b': {} }] };
|
|
|
|
_.unset(object, ['a', '0', 'b', 'c']);
|
|
// => true
|
|
|
|
console.log(object);
|
|
// => { 'a': [{ 'b': {} }] };
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_updateobject-path-updater"></a>`_.update(object, path, updater)`
|
|
<a href="#_updateobject-path-updater">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13194 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.update "See the npm package")
|
|
|
|
This method is like `_.set` except that accepts `updater` to produce the
|
|
value to set. Use `_.updateWith` to customize `path` creation. The `updater`
|
|
is invoked with one argument: *(value)*.
|
|
<br>
|
|
<br>
|
|
**Note:** This method mutates `object`.
|
|
|
|
#### Since
|
|
4.6.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to modify.
|
|
2. `path` *(Array|string)*: The path of the property to set.
|
|
3. `updater` *(Function)*: The function to produce the updated value.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns `object`.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'a': [{ 'b': { 'c': 3 } }] };
|
|
|
|
_.update(object, 'a[0].b.c', function(n) { return n * n; });
|
|
console.log(object.a[0].b.c);
|
|
// => 9
|
|
|
|
_.update(object, 'x[0].y.z', function(n) { return n ? n + 1 : 0; });
|
|
console.log(object.x[0].y.z);
|
|
// => 0
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_updatewithobject-path-updater-customizer"></a>`_.updateWith(object, path, updater, [customizer])`
|
|
<a href="#_updatewithobject-path-updater-customizer">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13222 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.updatewith "See the npm package")
|
|
|
|
This method is like `_.update` except that it accepts `customizer` which is
|
|
invoked to produce the objects of `path`. If `customizer` returns `undefined`
|
|
path creation is handled by the method instead. The `customizer` is invoked
|
|
with three arguments: *(nsValue, key, nsObject)*.
|
|
<br>
|
|
<br>
|
|
**Note:** This method mutates `object`.
|
|
|
|
#### Since
|
|
4.6.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to modify.
|
|
2. `path` *(Array|string)*: The path of the property to set.
|
|
3. `updater` *(Function)*: The function to produce the updated value.
|
|
4. `[customizer]` *(Function)*: The function to customize assigned values.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns `object`.
|
|
|
|
#### Example
|
|
```js
|
|
var object = {};
|
|
|
|
_.updateWith(object, '[0][1]', _.constant('a'), Object);
|
|
// => { '0': { '1': 'a' } }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_valuesobject"></a>`_.values(object)`
|
|
<a href="#_valuesobject">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13253 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.values "See the npm package")
|
|
|
|
Creates an array of the own enumerable string keyed property values of `object`.
|
|
<br>
|
|
<br>
|
|
**Note:** Non-object values are coerced to objects.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to query.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the array of property values.
|
|
|
|
#### Example
|
|
```js
|
|
function Foo() {
|
|
this.a = 1;
|
|
this.b = 2;
|
|
}
|
|
|
|
Foo.prototype.c = 3;
|
|
|
|
_.values(new Foo);
|
|
// => [1, 2] (iteration order is not guaranteed)
|
|
|
|
_.values('hi');
|
|
// => ['h', 'i']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_valuesinobject"></a>`_.valuesIn(object)`
|
|
<a href="#_valuesinobject">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13281 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.valuesin "See the npm package")
|
|
|
|
Creates an array of the own and inherited enumerable string keyed property
|
|
values of `object`.
|
|
<br>
|
|
<br>
|
|
**Note:** Non-object values are coerced to objects.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to query.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the array of property values.
|
|
|
|
#### Example
|
|
```js
|
|
function Foo() {
|
|
this.a = 1;
|
|
this.b = 2;
|
|
}
|
|
|
|
Foo.prototype.c = 3;
|
|
|
|
_.valuesIn(new Foo);
|
|
// => [1, 2, 3] (iteration order is not guaranteed)
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
## `“Seq” Methods`
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_value"></a>`_(value)`
|
|
<a href="#_value">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L1464 "View in source") [Ⓣ][1]
|
|
|
|
Creates a `lodash` object which wraps `value` to enable implicit method
|
|
chain sequences. Methods that operate on and return arrays, collections,
|
|
and functions can be chained together. Methods that retrieve a single value
|
|
or may return a primitive value will automatically end the chain sequence
|
|
and return the unwrapped value. Otherwise, the value must be unwrapped
|
|
with `_#value`.
|
|
<br>
|
|
<br>
|
|
Explicit chain sequences, which must be unwrapped with `_#value`, may be
|
|
enabled using `_.chain`.
|
|
<br>
|
|
<br>
|
|
The execution of chained methods is lazy, that is, it's deferred until
|
|
`_#value` is implicitly or explicitly called.
|
|
<br>
|
|
<br>
|
|
Lazy evaluation allows several methods to support shortcut fusion.
|
|
Shortcut fusion is an optimization to merge iteratee calls; this avoids
|
|
the creation of intermediate arrays and can greatly reduce the number of
|
|
iteratee executions. Sections of a chain sequence qualify for shortcut
|
|
fusion if the section is applied to an array of at least `200` elements
|
|
and any iteratees accept only one argument. The heuristic for whether a
|
|
section qualifies for shortcut fusion is subject to change.
|
|
<br>
|
|
<br>
|
|
Chaining is supported in custom builds as long as the `_#value` method is
|
|
directly or indirectly included in the build.
|
|
<br>
|
|
<br>
|
|
In addition to lodash methods, wrappers have `Array` and `String` methods.
|
|
<br>
|
|
<br>
|
|
The wrapper `Array` methods are:<br>
|
|
`concat`, `join`, `pop`, `push`, `shift`, `sort`, `splice`, and `unshift`
|
|
<br>
|
|
<br>
|
|
The wrapper `String` methods are:<br>
|
|
`replace` and `split`
|
|
<br>
|
|
<br>
|
|
The wrapper methods that support shortcut fusion are:<br>
|
|
`at`, `compact`, `drop`, `dropRight`, `dropWhile`, `filter`, `find`,
|
|
`findLast`, `head`, `initial`, `last`, `map`, `reject`, `reverse`, `slice`,
|
|
`tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray`
|
|
<br>
|
|
<br>
|
|
The chainable wrapper methods are:<br>
|
|
`after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`,
|
|
`before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`,
|
|
`commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`,
|
|
`curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`,
|
|
`difference`, `differenceBy`, `differenceWith`, `drop`, `dropRight`,
|
|
`dropRightWhile`, `dropWhile`, `extend`, `extendWith`, `fill`, `filter`,
|
|
`flatMap`, `flatMapDeep`, `flatMapDepth`, `flatten`, `flattenDeep`,
|
|
`flattenDepth`, `flip`, `flow`, `flowRight`, `fromPairs`, `functions`,
|
|
`functionsIn`, `groupBy`, `initial`, `intersection`, `intersectionBy`,
|
|
`intersectionWith`, `invert`, `invertBy`, `invokeMap`, `iteratee`, `keyBy`,
|
|
`keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`,
|
|
`memoize`, `merge`, `mergeWith`, `method`, `methodOf`, `mixin`, `negate`,
|
|
`nthArg`, `omit`, `omitBy`, `once`, `orderBy`, `over`, `overArgs`,
|
|
`overEvery`, `overSome`, `partial`, `partialRight`, `partition`, `pick`,
|
|
`pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`,
|
|
`pullAllWith`, `pullAt`, `push`, `range`, `rangeRight`, `rearg`, `reject`,
|
|
`remove`, `rest`, `reverse`, `sampleSize`, `set`, `setWith`, `shuffle`,
|
|
`slice`, `sort`, `sortBy`, `splice`, `spread`, `tail`, `take`, `takeRight`,
|
|
`takeRightWhile`, `takeWhile`, `tap`, `throttle`, `thru`, `toArray`,
|
|
`toPairs`, `toPairsIn`, `toPath`, `toPlainObject`, `transform`, `unary`,
|
|
`union`, `unionBy`, `unionWith`, `uniq`, `uniqBy`, `uniqWith`, `unset`,
|
|
`unshift`, `unzip`, `unzipWith`, `update`, `updateWith`, `values`,
|
|
`valuesIn`, `without`, `wrap`, `xor`, `xorBy`, `xorWith`, `zip`,
|
|
`zipObject`, `zipObjectDeep`, and `zipWith`
|
|
<br>
|
|
<br>
|
|
The wrapper methods that are **not** chainable by default are:<br>
|
|
`add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`,
|
|
`cloneDeep`, `cloneDeepWith`, `cloneWith`, `deburr`, `divide`, `each`,
|
|
`eachRight`, `endsWith`, `eq`, `escape`, `escapeRegExp`, `every`, `find`,
|
|
`findIndex`, `findKey`, `findLast`, `findLastIndex`, `findLastKey`, `first`,
|
|
`floor`, `forEach`, `forEachRight`, `forIn`, `forInRight`, `forOwn`,
|
|
`forOwnRight`, `get`, `gt`, `gte`, `has`, `hasIn`, `head`, `identity`,
|
|
`includes`, `indexOf`, `inRange`, `invoke`, `isArguments`, `isArray`,
|
|
`isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`, `isBoolean`,
|
|
`isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`, `isEqualWith`,
|
|
`isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`, `isMap`,
|
|
`isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`,
|
|
`isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`,
|
|
`isSafeInteger`, `isSet`, `isString`, `isUndefined`, `isTypedArray`,
|
|
`isWeakMap`, `isWeakSet`, `join`, `kebabCase`, `last`, `lastIndexOf`,
|
|
`lowerCase`, `lowerFirst`, `lt`, `lte`, `max`, `maxBy`, `mean`, `meanBy`,
|
|
`min`, `minBy`, `multiply`, `noConflict`, `noop`, `now`, `nth`, `pad`,
|
|
`padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`,
|
|
`repeat`, `result`, `round`, `runInContext`, `sample`, `shift`, `size`,
|
|
`snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`,
|
|
`sortedLastIndexBy`, `startCase`, `startsWith`, `stubArray`, `stubFalse`,
|
|
`stubObject`, `stubString`, `stubTrue`, `subtract`, `sum`, `sumBy`,
|
|
`template`, `times`, `toFinite`, `toInteger`, `toJSON`, `toLength`,
|
|
`toLower`, `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`,
|
|
`trimEnd`, `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`,
|
|
`upperFirst`, `value`, and `words`
|
|
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to wrap in a `lodash` instance.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the new `lodash` wrapper instance.
|
|
|
|
#### Example
|
|
```js
|
|
function square(n) {
|
|
return n * n;
|
|
}
|
|
|
|
var wrapped = _([1, 2, 3]);
|
|
|
|
// Returns an unwrapped value.
|
|
wrapped.reduce(_.add);
|
|
// => 6
|
|
|
|
// Returns a wrapped value.
|
|
var squares = wrapped.map(square);
|
|
|
|
_.isArray(squares);
|
|
// => false
|
|
|
|
_.isArray(squares.value());
|
|
// => true
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_chainvalue"></a>`_.chain(value)`
|
|
<a href="#_chainvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8031 "View in source") [Ⓣ][1]
|
|
|
|
Creates a `lodash` wrapper instance that wraps `value` with explicit method
|
|
chain sequences enabled. The result of such sequences must be unwrapped
|
|
with `_#value`.
|
|
|
|
#### Since
|
|
1.3.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to wrap.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the new `lodash` wrapper instance.
|
|
|
|
#### Example
|
|
```js
|
|
var users = [
|
|
{ 'user': 'barney', 'age': 36 },
|
|
{ 'user': 'fred', 'age': 40 },
|
|
{ 'user': 'pebbles', 'age': 1 }
|
|
];
|
|
|
|
var youngest = _
|
|
.chain(users)
|
|
.sortBy('age')
|
|
.map(function(o) {
|
|
return o.user + ' is ' + o.age;
|
|
})
|
|
.head()
|
|
.value();
|
|
// => 'pebbles is 1'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_tapvalue-interceptor"></a>`_.tap(value, interceptor)`
|
|
<a href="#_tapvalue-interceptor">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8060 "View in source") [Ⓣ][1]
|
|
|
|
This method invokes `interceptor` and returns `value`. The interceptor
|
|
is invoked with one argument; *(value)*. The purpose of this method is to
|
|
"tap into" a method chain sequence in order to modify intermediate results.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to provide to `interceptor`.
|
|
2. `interceptor` *(Function)*: The function to invoke.
|
|
|
|
#### Returns
|
|
*(*)*: Returns `value`.
|
|
|
|
#### Example
|
|
```js
|
|
_([1, 2, 3])
|
|
.tap(function(array) {
|
|
// Mutate input array.
|
|
array.pop();
|
|
})
|
|
.reverse()
|
|
.value();
|
|
// => [2, 1]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_thruvalue-interceptor"></a>`_.thru(value, interceptor)`
|
|
<a href="#_thruvalue-interceptor">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8088 "View in source") [Ⓣ][1]
|
|
|
|
This method is like `_.tap` except that it returns the result of `interceptor`.
|
|
The purpose of this method is to "pass thru" values replacing intermediate
|
|
results in a method chain sequence.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to provide to `interceptor`.
|
|
2. `interceptor` *(Function)*: The function to invoke.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the result of `interceptor`.
|
|
|
|
#### Example
|
|
```js
|
|
_(' abc ')
|
|
.chain()
|
|
.trim()
|
|
.thru(function(value) {
|
|
return [value];
|
|
})
|
|
.value();
|
|
// => ['abc']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_prototypesymboliterator"></a>`_.prototype[Symbol.iterator]()`
|
|
<a href="#_prototypesymboliterator">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8244 "View in source") [Ⓣ][1]
|
|
|
|
Enables the wrapper to be iterable.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Returns
|
|
*(Object)*: Returns the wrapper object.
|
|
|
|
#### Example
|
|
```js
|
|
var wrapped = _([1, 2]);
|
|
|
|
wrapped[Symbol.iterator]() === wrapped;
|
|
// => true
|
|
|
|
Array.from(wrapped);
|
|
// => [1, 2]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_prototypeatpaths"></a>`_.prototype.at([paths])`
|
|
<a href="#_prototypeatpaths">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8108 "View in source") [Ⓣ][1]
|
|
|
|
This method is the wrapper version of `_.at`.
|
|
|
|
#### Since
|
|
1.0.0
|
|
#### Arguments
|
|
1. `[paths]` *(...(string|string[]))*: The property paths of elements to pick.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the new `lodash` wrapper instance.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
|
|
|
|
_(object).at(['a[0].b.c', 'a[1]']).value();
|
|
// => [3, 4]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_prototypechain"></a>`_.prototype.chain()`
|
|
<a href="#_prototypechain">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8160 "View in source") [Ⓣ][1]
|
|
|
|
Creates a `lodash` wrapper instance with explicit method chain sequences enabled.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Returns
|
|
*(Object)*: Returns the new `lodash` wrapper instance.
|
|
|
|
#### Example
|
|
```js
|
|
var users = [
|
|
{ 'user': 'barney', 'age': 36 },
|
|
{ 'user': 'fred', 'age': 40 }
|
|
];
|
|
|
|
// A sequence without explicit chaining.
|
|
_(users).head();
|
|
// => { 'user': 'barney', 'age': 36 }
|
|
|
|
// A sequence with explicit chaining.
|
|
_(users)
|
|
.chain()
|
|
.head()
|
|
.pick('user')
|
|
.value();
|
|
// => { 'user': 'barney' }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_prototypecommit"></a>`_.prototype.commit()`
|
|
<a href="#_prototypecommit">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8190 "View in source") [Ⓣ][1]
|
|
|
|
Executes the chain sequence and returns the wrapped result.
|
|
|
|
#### Since
|
|
3.2.0
|
|
#### Returns
|
|
*(Object)*: Returns the new `lodash` wrapper instance.
|
|
|
|
#### Example
|
|
```js
|
|
var array = [1, 2];
|
|
var wrapped = _(array).push(3);
|
|
|
|
console.log(array);
|
|
// => [1, 2]
|
|
|
|
wrapped = wrapped.commit();
|
|
console.log(array);
|
|
// => [1, 2, 3]
|
|
|
|
wrapped.last();
|
|
// => 3
|
|
|
|
console.log(array);
|
|
// => [1, 2, 3]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_prototypenext"></a>`_.prototype.next()`
|
|
<a href="#_prototypenext">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8216 "View in source") [Ⓣ][1]
|
|
|
|
Gets the next value on a wrapped object following the
|
|
[iterator protocol](https://mdn.io/iteration_protocols#iterator).
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Returns
|
|
*(Object)*: Returns the next iterator value.
|
|
|
|
#### Example
|
|
```js
|
|
var wrapped = _([1, 2]);
|
|
|
|
wrapped.next();
|
|
// => { 'done': false, 'value': 1 }
|
|
|
|
wrapped.next();
|
|
// => { 'done': false, 'value': 2 }
|
|
|
|
wrapped.next();
|
|
// => { 'done': true, 'value': undefined }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_prototypeplantvalue"></a>`_.prototype.plant(value)`
|
|
<a href="#_prototypeplantvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8272 "View in source") [Ⓣ][1]
|
|
|
|
Creates a clone of the chain sequence planting `value` as the wrapped value.
|
|
|
|
#### Since
|
|
3.2.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to plant.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns the new `lodash` wrapper instance.
|
|
|
|
#### Example
|
|
```js
|
|
function square(n) {
|
|
return n * n;
|
|
}
|
|
|
|
var wrapped = _([1, 2]).map(square);
|
|
var other = wrapped.plant([3, 4]);
|
|
|
|
other.value();
|
|
// => [9, 16]
|
|
|
|
wrapped.value();
|
|
// => [1, 4]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_prototypereverse"></a>`_.prototype.reverse()`
|
|
<a href="#_prototypereverse">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8312 "View in source") [Ⓣ][1]
|
|
|
|
This method is the wrapper version of `_.reverse`.
|
|
<br>
|
|
<br>
|
|
**Note:** This method mutates the wrapped array.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Returns
|
|
*(Object)*: Returns the new `lodash` wrapper instance.
|
|
|
|
#### Example
|
|
```js
|
|
var array = [1, 2, 3];
|
|
|
|
_(array).reverse().value()
|
|
// => [3, 2, 1]
|
|
|
|
console.log(array);
|
|
// => [3, 2, 1]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_prototypevalue"></a>`_.prototype.value()`
|
|
<a href="#_prototypevalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L8344 "View in source") [Ⓣ][1]
|
|
|
|
Executes the chain sequence to resolve the unwrapped value.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Aliases
|
|
*_.prototype.toJSON, _.prototype.valueOf*
|
|
|
|
#### Returns
|
|
*(*)*: Returns the resolved unwrapped value.
|
|
|
|
#### Example
|
|
```js
|
|
_([1, 2, 3]).value();
|
|
// => [1, 2, 3]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
## `“String” Methods`
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_camelcasestring"></a>`_.camelCase([string=''])`
|
|
<a href="#_camelcasestring">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13464 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.camelcase "See the npm package")
|
|
|
|
Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase).
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to convert.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the camel cased string.
|
|
|
|
#### Example
|
|
```js
|
|
_.camelCase('Foo Bar');
|
|
// => 'fooBar'
|
|
|
|
_.camelCase('--foo-bar--');
|
|
// => 'fooBar'
|
|
|
|
_.camelCase('__FOO_BAR__');
|
|
// => 'fooBar'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_capitalizestring"></a>`_.capitalize([string=''])`
|
|
<a href="#_capitalizestring">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13484 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.capitalize "See the npm package")
|
|
|
|
Converts the first character of `string` to upper case and the remaining
|
|
to lower case.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to capitalize.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the capitalized string.
|
|
|
|
#### Example
|
|
```js
|
|
_.capitalize('FRED');
|
|
// => 'Fred'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_deburrstring"></a>`_.deburr([string=''])`
|
|
<a href="#_deburrstring">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13505 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.deburr "See the npm package")
|
|
|
|
Deburrs `string` by converting
|
|
[latin-1 supplementary letters](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table)
|
|
to basic latin letters and removing
|
|
[combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks).
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to deburr.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the deburred string.
|
|
|
|
#### Example
|
|
```js
|
|
_.deburr('déjà vu');
|
|
// => 'deja vu'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_endswithstring-target-positionstringlength"></a>`_.endsWith([string=''], [target], [position=string.length])`
|
|
<a href="#_endswithstring-target-positionstringlength">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13533 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.endswith "See the npm package")
|
|
|
|
Checks if `string` ends with the given target string.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to search.
|
|
2. `[target]` *(string)*: The string to search for.
|
|
3. `[position=string.length]` *(number)*: The position to search up to.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `string` ends with `target`, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.endsWith('abc', 'c');
|
|
// => true
|
|
|
|
_.endsWith('abc', 'b');
|
|
// => false
|
|
|
|
_.endsWith('abc', 'b', 2);
|
|
// => true
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_escapestring"></a>`_.escape([string=''])`
|
|
<a href="#_escapestring">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13580 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.escape "See the npm package")
|
|
|
|
Converts the characters "&", "<", ">", '"', "'", and "\`" in `string` to
|
|
their corresponding HTML entities.
|
|
<br>
|
|
<br>
|
|
**Note:** No other characters are escaped. To escape additional
|
|
characters use a third-party library like [_he_](https://mths.be/he).
|
|
<br>
|
|
<br>
|
|
Though the ">" character is escaped for symmetry, characters like
|
|
">" and "/" don't need escaping in HTML and have no special meaning
|
|
unless they're part of a tag or unquoted attribute value. See
|
|
[Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
|
|
*(under "semi-related fun fact")* for more details.
|
|
<br>
|
|
<br>
|
|
Backticks are escaped because in IE < `9`, they can break out of
|
|
attribute values or HTML comments. See [#59](https://html5sec.org/#59),
|
|
[#102](https://html5sec.org/#102), [#108](https://html5sec.org/#108), and
|
|
[#133](https://html5sec.org/#133) of the
|
|
[HTML5 Security Cheatsheet](https://html5sec.org/) for more details.
|
|
<br>
|
|
<br>
|
|
When working with HTML you should always
|
|
[quote attribute values](http://wonko.com/post/html-escaping) to reduce
|
|
XSS vectors.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to escape.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the escaped string.
|
|
|
|
#### Example
|
|
```js
|
|
_.escape('fred, barney, & pebbles');
|
|
// => 'fred, barney, & pebbles'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_escaperegexpstring"></a>`_.escapeRegExp([string=''])`
|
|
<a href="#_escaperegexpstring">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13602 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.escaperegexp "See the npm package")
|
|
|
|
Escapes the `RegExp` special characters "^", "$", "\", ".", "*", "+",
|
|
"?", "(", ")", "[", "]", "{", "}", and "|" in `string`.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to escape.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the escaped string.
|
|
|
|
#### Example
|
|
```js
|
|
_.escapeRegExp('[lodash](https://lodash.com/)');
|
|
// => '\[lodash\]\(https://lodash\.com/\)'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_kebabcasestring"></a>`_.kebabCase([string=''])`
|
|
<a href="#_kebabcasestring">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13630 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.kebabcase "See the npm package")
|
|
|
|
Converts `string` to
|
|
[kebab case](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles).
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to convert.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the kebab cased string.
|
|
|
|
#### Example
|
|
```js
|
|
_.kebabCase('Foo Bar');
|
|
// => 'foo-bar'
|
|
|
|
_.kebabCase('fooBar');
|
|
// => 'foo-bar'
|
|
|
|
_.kebabCase('__FOO_BAR__');
|
|
// => 'foo-bar'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_lowercasestring"></a>`_.lowerCase([string=''])`
|
|
<a href="#_lowercasestring">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13654 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.lowercase "See the npm package")
|
|
|
|
Converts `string`, as space separated words, to lower case.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to convert.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the lower cased string.
|
|
|
|
#### Example
|
|
```js
|
|
_.lowerCase('--Foo-Bar--');
|
|
// => 'foo bar'
|
|
|
|
_.lowerCase('fooBar');
|
|
// => 'foo bar'
|
|
|
|
_.lowerCase('__FOO_BAR__');
|
|
// => 'foo bar'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_lowerfirststring"></a>`_.lowerFirst([string=''])`
|
|
<a href="#_lowerfirststring">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13675 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.lowerfirst "See the npm package")
|
|
|
|
Converts the first character of `string` to lower case.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to convert.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the converted string.
|
|
|
|
#### Example
|
|
```js
|
|
_.lowerFirst('Fred');
|
|
// => 'fred'
|
|
|
|
_.lowerFirst('FRED');
|
|
// => 'fRED'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_padstring-length0-chars"></a>`_.pad([string=''], [length=0], [chars=' '])`
|
|
<a href="#_padstring-length0-chars">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13700 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.pad "See the npm package")
|
|
|
|
Pads `string` on the left and right sides if it's shorter than `length`.
|
|
Padding characters are truncated if they can't be evenly divided by `length`.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to pad.
|
|
2. `[length=0]` *(number)*: The padding length.
|
|
3. `[chars=' ']` *(string)*: The string used as padding.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the padded string.
|
|
|
|
#### Example
|
|
```js
|
|
_.pad('abc', 8);
|
|
// => ' abc '
|
|
|
|
_.pad('abc', 8, '_-');
|
|
// => '_-abc_-_'
|
|
|
|
_.pad('abc', 3);
|
|
// => 'abc'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_padendstring-length0-chars"></a>`_.padEnd([string=''], [length=0], [chars=' '])`
|
|
<a href="#_padendstring-length0-chars">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13739 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.padend "See the npm package")
|
|
|
|
Pads `string` on the right side if it's shorter than `length`. Padding
|
|
characters are truncated if they exceed `length`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to pad.
|
|
2. `[length=0]` *(number)*: The padding length.
|
|
3. `[chars=' ']` *(string)*: The string used as padding.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the padded string.
|
|
|
|
#### Example
|
|
```js
|
|
_.padEnd('abc', 6);
|
|
// => 'abc '
|
|
|
|
_.padEnd('abc', 6, '_-');
|
|
// => 'abc_-_'
|
|
|
|
_.padEnd('abc', 3);
|
|
// => 'abc'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_padstartstring-length0-chars"></a>`_.padStart([string=''], [length=0], [chars=' '])`
|
|
<a href="#_padstartstring-length0-chars">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13772 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.padstart "See the npm package")
|
|
|
|
Pads `string` on the left side if it's shorter than `length`. Padding
|
|
characters are truncated if they exceed `length`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to pad.
|
|
2. `[length=0]` *(number)*: The padding length.
|
|
3. `[chars=' ']` *(string)*: The string used as padding.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the padded string.
|
|
|
|
#### Example
|
|
```js
|
|
_.padStart('abc', 6);
|
|
// => ' abc'
|
|
|
|
_.padStart('abc', 6, '_-');
|
|
// => '_-_abc'
|
|
|
|
_.padStart('abc', 3);
|
|
// => 'abc'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_parseintstring-radix10"></a>`_.parseInt(string, [radix=10])`
|
|
<a href="#_parseintstring-radix10">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13806 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.parseint "See the npm package")
|
|
|
|
Converts `string` to an integer of the specified radix. If `radix` is
|
|
`undefined` or `0`, a `radix` of `10` is used unless `value` is a
|
|
hexadecimal, in which case a `radix` of `16` is used.
|
|
<br>
|
|
<br>
|
|
**Note:** This method aligns with the
|
|
[ES5 implementation](https://es5.github.io/#x15.1.2.2) of `parseInt`.
|
|
|
|
#### Since
|
|
1.1.0
|
|
#### Arguments
|
|
1. `string` *(string)*: The string to convert.
|
|
2. `[radix=10]` *(number)*: The radix to interpret `value` by.
|
|
|
|
#### Returns
|
|
*(number)*: Returns the converted integer.
|
|
|
|
#### Example
|
|
```js
|
|
_.parseInt('08');
|
|
// => 8
|
|
|
|
_.map(['6', '08', '10'], _.parseInt);
|
|
// => [6, 8, 10]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_repeatstring-n1"></a>`_.repeat([string=''], [n=1])`
|
|
<a href="#_repeatstring-n1">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13840 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.repeat "See the npm package")
|
|
|
|
Repeats the given string `n` times.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to repeat.
|
|
2. `[n=1]` *(number)*: The number of times to repeat the string.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the repeated string.
|
|
|
|
#### Example
|
|
```js
|
|
_.repeat('*', 3);
|
|
// => '***'
|
|
|
|
_.repeat('abc', 2);
|
|
// => 'abcabc'
|
|
|
|
_.repeat('abc', 0);
|
|
// => ''
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_replacestring-pattern-replacement"></a>`_.replace([string=''], pattern, replacement)`
|
|
<a href="#_replacestring-pattern-replacement">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13868 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.replace "See the npm package")
|
|
|
|
Replaces matches for `pattern` in `string` with `replacement`.
|
|
<br>
|
|
<br>
|
|
**Note:** This method is based on
|
|
[`String#replace`](https://mdn.io/String/replace).
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to modify.
|
|
2. `pattern` *(RegExp|string)*: The pattern to replace.
|
|
3. `replacement` *(Function|string)*: The match replacement.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the modified string.
|
|
|
|
#### Example
|
|
```js
|
|
_.replace('Hi Fred', 'Fred', 'Barney');
|
|
// => 'Hi Barney'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_snakecasestring"></a>`_.snakeCase([string=''])`
|
|
<a href="#_snakecasestring">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13896 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.snakecase "See the npm package")
|
|
|
|
Converts `string` to
|
|
[snake case](https://en.wikipedia.org/wiki/Snake_case).
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to convert.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the snake cased string.
|
|
|
|
#### Example
|
|
```js
|
|
_.snakeCase('Foo Bar');
|
|
// => 'foo_bar'
|
|
|
|
_.snakeCase('fooBar');
|
|
// => 'foo_bar'
|
|
|
|
_.snakeCase('--FOO-BAR--');
|
|
// => 'foo_bar'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_splitstring-separator-limit"></a>`_.split([string=''], separator, [limit])`
|
|
<a href="#_splitstring-separator-limit">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13919 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.split "See the npm package")
|
|
|
|
Splits `string` by `separator`.
|
|
<br>
|
|
<br>
|
|
**Note:** This method is based on
|
|
[`String#split`](https://mdn.io/String/split).
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to split.
|
|
2. `separator` *(RegExp|string)*: The separator pattern to split by.
|
|
3. `[limit]` *(number)*: The length to truncate results to.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the string segments.
|
|
|
|
#### Example
|
|
```js
|
|
_.split('a-b-c', '-', 2);
|
|
// => ['a', 'b']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_startcasestring"></a>`_.startCase([string=''])`
|
|
<a href="#_startcasestring">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13961 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.startcase "See the npm package")
|
|
|
|
Converts `string` to
|
|
[start case](https://en.wikipedia.org/wiki/Letter_case#Stylistic_or_specialised_usage).
|
|
|
|
#### Since
|
|
3.1.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to convert.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the start cased string.
|
|
|
|
#### Example
|
|
```js
|
|
_.startCase('--foo-bar--');
|
|
// => 'Foo Bar'
|
|
|
|
_.startCase('fooBar');
|
|
// => 'Foo Bar'
|
|
|
|
_.startCase('__FOO_BAR__');
|
|
// => 'FOO BAR'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_startswithstring-target-position0"></a>`_.startsWith([string=''], [target], [position=0])`
|
|
<a href="#_startswithstring-target-position0">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L13988 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.startswith "See the npm package")
|
|
|
|
Checks if `string` starts with the given target string.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to search.
|
|
2. `[target]` *(string)*: The string to search for.
|
|
3. `[position=0]` *(number)*: The position to search from.
|
|
|
|
#### Returns
|
|
*(boolean)*: Returns `true` if `string` starts with `target`, else `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.startsWith('abc', 'a');
|
|
// => true
|
|
|
|
_.startsWith('abc', 'b');
|
|
// => false
|
|
|
|
_.startsWith('abc', 'b', 1);
|
|
// => true
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_templatestring-options-optionsescape_templatesettingsescape-optionsevaluate_templatesettingsevaluate-optionsimports_templatesettingsimports-optionsinterpolate_templatesettingsinterpolate-optionssourceurllodashtemplatesourcesn-optionsvariableobj"></a>`_.template([string=''], [options={}], [options.escape=_.templateSettings.escape], [options.evaluate=_.templateSettings.evaluate], [options.imports=_.templateSettings.imports], [options.interpolate=_.templateSettings.interpolate], [options.sourceURL='lodash.templateSources[n]'], [options.variable='obj'])`
|
|
<a href="#_templatestring-options-optionsescape_templatesettingsescape-optionsevaluate_templatesettingsevaluate-optionsimports_templatesettingsimports-optionsinterpolate_templatesettingsinterpolate-optionssourceurllodashtemplatesourcesn-optionsvariableobj">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14097 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.template "See the npm package")
|
|
|
|
Creates a compiled template function that can interpolate data properties
|
|
in "interpolate" delimiters, HTML-escape interpolated data properties in
|
|
"escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data
|
|
properties may be accessed as free variables in the template. If a setting
|
|
object is given, it takes precedence over `_.templateSettings` values.
|
|
<br>
|
|
<br>
|
|
**Note:** In the development build `_.template` utilizes
|
|
[sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
|
|
for easier debugging.
|
|
<br>
|
|
<br>
|
|
For more information on precompiling templates see
|
|
[lodash's custom builds documentation](https://lodash.com/custom-builds).
|
|
<br>
|
|
<br>
|
|
For more information on Chrome extension sandboxes see
|
|
[Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval).
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The template string.
|
|
2. `[options={}]` *(Object)*: The options object.
|
|
3. `[options.escape=_.templateSettings.escape]` *(RegExp)*: The HTML "escape" delimiter.
|
|
4. `[options.evaluate=_.templateSettings.evaluate]` *(RegExp)*: The "evaluate" delimiter.
|
|
5. `[options.imports=_.templateSettings.imports]` *(Object)*: An object to import into the template as free variables.
|
|
6. `[options.interpolate=_.templateSettings.interpolate]` *(RegExp)*: The "interpolate" delimiter.
|
|
7. `[options.sourceURL='lodash.templateSources[n]']` *(string)*: The sourceURL of the compiled template.
|
|
8. `[options.variable='obj']` *(string)*: The data object variable name.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the compiled template function.
|
|
|
|
#### Example
|
|
```js
|
|
// Use the "interpolate" delimiter to create a compiled template.
|
|
var compiled = _.template('hello <%= user %>!');
|
|
compiled({ 'user': 'fred' });
|
|
// => 'hello fred!'
|
|
|
|
// Use the HTML "escape" delimiter to escape data property values.
|
|
var compiled = _.template('<b><%- value %></b>');
|
|
compiled({ 'value': '<script>' });
|
|
// => '<b><script></b>'
|
|
|
|
// Use the "evaluate" delimiter to execute JavaScript and generate HTML.
|
|
var compiled = _.template('<% _.forEach(users, function(user) { %><li><%- user %></li><% }); %>');
|
|
compiled({ 'users': ['fred', 'barney'] });
|
|
// => '<li>fred</li><li>barney</li>'
|
|
|
|
// Use the internal `print` function in "evaluate" delimiters.
|
|
var compiled = _.template('<% print("hello " + user); %>!');
|
|
compiled({ 'user': 'barney' });
|
|
// => 'hello barney!'
|
|
|
|
// Use the ES delimiter as an alternative to the default "interpolate" delimiter.
|
|
var compiled = _.template('hello ${ user }!');
|
|
compiled({ 'user': 'pebbles' });
|
|
// => 'hello pebbles!'
|
|
|
|
// Use backslashes to treat delimiters as plain text.
|
|
var compiled = _.template('<%= "\\<%- value %\\>" %>');
|
|
compiled({ 'value': 'ignored' });
|
|
// => '<%- value %>'
|
|
|
|
// Use the `imports` option to import `jQuery` as `jq`.
|
|
var text = '<% jq.each(users, function(user) { %><li><%- user %></li><% }); %>';
|
|
var compiled = _.template(text, { 'imports': { 'jq': jQuery } });
|
|
compiled({ 'users': ['fred', 'barney'] });
|
|
// => '<li>fred</li><li>barney</li>'
|
|
|
|
// Use the `sourceURL` option to specify a custom sourceURL for the template.
|
|
var compiled = _.template('hello <%= user %>!', { 'sourceURL': '/basic/greeting.jst' });
|
|
compiled(data);
|
|
// => Find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector.
|
|
|
|
// Use the `variable` option to ensure a with-statement isn't used in the compiled template.
|
|
var compiled = _.template('hi <%= data.user %>!', { 'variable': 'data' });
|
|
compiled.source;
|
|
// => function(data) {
|
|
// var __t, __p = '';
|
|
// __p += 'hi ' + ((__t = ( data.user )) == null ? '' : __t) + '!';
|
|
// return __p;
|
|
// }
|
|
|
|
// Use custom template delimiters.
|
|
_.templateSettings.interpolate = /{{([\s\S]+?)}}/g;
|
|
var compiled = _.template('hello {{ user }}!');
|
|
compiled({ 'user': 'mustache' });
|
|
// => 'hello mustache!'
|
|
|
|
// Use the `source` property to inline compiled templates for meaningful
|
|
// line numbers in error messages and stack traces.
|
|
fs.writeFileSync(path.join(process.cwd(), 'jst.js'), '\
|
|
var JST = {\
|
|
"main": ' + _.template(mainText).source + '\
|
|
};\
|
|
');
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_tolowerstring"></a>`_.toLower([string=''])`
|
|
<a href="#_tolowerstring">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14226 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.tolower "See the npm package")
|
|
|
|
Converts `string`, as a whole, to lower case just like
|
|
[String#toLowerCase](https://mdn.io/toLowerCase).
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to convert.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the lower cased string.
|
|
|
|
#### Example
|
|
```js
|
|
_.toLower('--Foo-Bar--');
|
|
// => '--foo-bar--'
|
|
|
|
_.toLower('fooBar');
|
|
// => 'foobar'
|
|
|
|
_.toLower('__FOO_BAR__');
|
|
// => '__foo_bar__'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_toupperstring"></a>`_.toUpper([string=''])`
|
|
<a href="#_toupperstring">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14251 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.toupper "See the npm package")
|
|
|
|
Converts `string`, as a whole, to upper case just like
|
|
[String#toUpperCase](https://mdn.io/toUpperCase).
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to convert.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the upper cased string.
|
|
|
|
#### Example
|
|
```js
|
|
_.toUpper('--foo-bar--');
|
|
// => '--FOO-BAR--'
|
|
|
|
_.toUpper('fooBar');
|
|
// => 'FOOBAR'
|
|
|
|
_.toUpper('__foo_bar__');
|
|
// => '__FOO_BAR__'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_trimstring-charswhitespace"></a>`_.trim([string=''], [chars=whitespace])`
|
|
<a href="#_trimstring-charswhitespace">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14277 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.trim "See the npm package")
|
|
|
|
Removes leading and trailing whitespace or specified characters from `string`.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to trim.
|
|
2. `[chars=whitespace]` *(string)*: The characters to trim.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the trimmed string.
|
|
|
|
#### Example
|
|
```js
|
|
_.trim(' abc ');
|
|
// => 'abc'
|
|
|
|
_.trim('-_-abc-_-', '_-');
|
|
// => 'abc'
|
|
|
|
_.map([' foo ', ' bar '], _.trim);
|
|
// => ['foo', 'bar']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_trimendstring-charswhitespace"></a>`_.trimEnd([string=''], [chars=whitespace])`
|
|
<a href="#_trimendstring-charswhitespace">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14312 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.trimend "See the npm package")
|
|
|
|
Removes trailing whitespace or specified characters from `string`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to trim.
|
|
2. `[chars=whitespace]` *(string)*: The characters to trim.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the trimmed string.
|
|
|
|
#### Example
|
|
```js
|
|
_.trimEnd(' abc ');
|
|
// => ' abc'
|
|
|
|
_.trimEnd('-_-abc-_-', '_-');
|
|
// => '-_-abc'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_trimstartstring-charswhitespace"></a>`_.trimStart([string=''], [chars=whitespace])`
|
|
<a href="#_trimstartstring-charswhitespace">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14345 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.trimstart "See the npm package")
|
|
|
|
Removes leading whitespace or specified characters from `string`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to trim.
|
|
2. `[chars=whitespace]` *(string)*: The characters to trim.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the trimmed string.
|
|
|
|
#### Example
|
|
```js
|
|
_.trimStart(' abc ');
|
|
// => 'abc '
|
|
|
|
_.trimStart('-_-abc-_-', '_-');
|
|
// => 'abc-_-'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_truncatestring-options-optionslength30-optionsomission-optionsseparator"></a>`_.truncate([string=''], [options={}], [options.length=30], [options.omission='...'], [options.separator])`
|
|
<a href="#_truncatestring-options-optionslength30-optionsomission-optionsseparator">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14396 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.truncate "See the npm package")
|
|
|
|
Truncates `string` if it's longer than the given maximum string length.
|
|
The last characters of the truncated string are replaced with the omission
|
|
string which defaults to "...".
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to truncate.
|
|
2. `[options={}]` *(Object)*: The options object.
|
|
3. `[options.length=30]` *(number)*: The maximum string length.
|
|
4. `[options.omission='...']` *(string)*: The string to indicate text is omitted.
|
|
5. `[options.separator]` *(RegExp|string)*: The separator pattern to truncate to.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the truncated string.
|
|
|
|
#### Example
|
|
```js
|
|
_.truncate('hi-diddly-ho there, neighborino');
|
|
// => 'hi-diddly-ho there, neighbo...'
|
|
|
|
_.truncate('hi-diddly-ho there, neighborino', {
|
|
'length': 24,
|
|
'separator': ' '
|
|
});
|
|
// => 'hi-diddly-ho there,...'
|
|
|
|
_.truncate('hi-diddly-ho there, neighborino', {
|
|
'length': 24,
|
|
'separator': /,? +/
|
|
});
|
|
// => 'hi-diddly-ho there...'
|
|
|
|
_.truncate('hi-diddly-ho there, neighborino', {
|
|
'omission': ' [...]'
|
|
});
|
|
// => 'hi-diddly-ho there, neig [...]'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_unescapestring"></a>`_.unescape([string=''])`
|
|
<a href="#_unescapestring">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14471 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.unescape "See the npm package")
|
|
|
|
The inverse of `_.escape`; this method converts the HTML entities
|
|
`&`, `<`, `>`, `"`, `'`, and ``` in `string` to
|
|
their corresponding characters.
|
|
<br>
|
|
<br>
|
|
**Note:** No other HTML entities are unescaped. To unescape additional
|
|
HTML entities use a third-party library like [_he_](https://mths.be/he).
|
|
|
|
#### Since
|
|
0.6.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to unescape.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the unescaped string.
|
|
|
|
#### Example
|
|
```js
|
|
_.unescape('fred, barney, & pebbles');
|
|
// => 'fred, barney, & pebbles'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_uppercasestring"></a>`_.upperCase([string=''])`
|
|
<a href="#_uppercasestring">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14498 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.uppercase "See the npm package")
|
|
|
|
Converts `string`, as space separated words, to upper case.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to convert.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the upper cased string.
|
|
|
|
#### Example
|
|
```js
|
|
_.upperCase('--foo-bar');
|
|
// => 'FOO BAR'
|
|
|
|
_.upperCase('fooBar');
|
|
// => 'FOO BAR'
|
|
|
|
_.upperCase('__foo_bar__');
|
|
// => 'FOO BAR'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_upperfirststring"></a>`_.upperFirst([string=''])`
|
|
<a href="#_upperfirststring">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14519 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.upperfirst "See the npm package")
|
|
|
|
Converts the first character of `string` to upper case.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to convert.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the converted string.
|
|
|
|
#### Example
|
|
```js
|
|
_.upperFirst('fred');
|
|
// => 'Fred'
|
|
|
|
_.upperFirst('FRED');
|
|
// => 'FRED'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_wordsstring-pattern"></a>`_.words([string=''], [pattern])`
|
|
<a href="#_wordsstring-pattern">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14540 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.words "See the npm package")
|
|
|
|
Splits `string` into an array of its words.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `[string='']` *(string)*: The string to inspect.
|
|
2. `[pattern]` *(RegExp|string)*: The pattern to match words.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the words of `string`.
|
|
|
|
#### Example
|
|
```js
|
|
_.words('fred, barney, & pebbles');
|
|
// => ['fred', 'barney', 'pebbles']
|
|
|
|
_.words('fred, barney, & pebbles', /[^, ]+/g);
|
|
// => ['fred', 'barney', '&', 'pebbles']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
## `“Util” Methods`
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_attemptfunc-args"></a>`_.attempt(func, [args])`
|
|
<a href="#_attemptfunc-args">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14574 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.attempt "See the npm package")
|
|
|
|
Attempts to invoke `func`, returning either the result or the caught error
|
|
object. Any additional arguments are provided to `func` when it's invoked.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `func` *(Function)*: The function to attempt.
|
|
2. `[args]` *(...*)*: The arguments to invoke `func` with.
|
|
|
|
#### Returns
|
|
*(*)*: Returns the `func` result or error object.
|
|
|
|
#### Example
|
|
```js
|
|
// Avoid throwing errors for invalid selectors.
|
|
var elements = _.attempt(function(selector) {
|
|
return document.querySelectorAll(selector);
|
|
}, '>_>');
|
|
|
|
if (_.isError(elements)) {
|
|
elements = [];
|
|
}
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_bindallobject-methodnames"></a>`_.bindAll(object, methodNames)`
|
|
<a href="#_bindallobject-methodnames">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14608 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.bindall "See the npm package")
|
|
|
|
Binds methods of an object to the object itself, overwriting the existing
|
|
method.
|
|
<br>
|
|
<br>
|
|
**Note:** This method doesn't set the "length" property of bound functions.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to bind and assign the bound methods to.
|
|
2. `methodNames` *(...(string|string[]))*: The object method names to bind.
|
|
|
|
#### Returns
|
|
*(Object)*: Returns `object`.
|
|
|
|
#### Example
|
|
```js
|
|
var view = {
|
|
'label': 'docs',
|
|
'onClick': function() {
|
|
console.log('clicked ' + this.label);
|
|
}
|
|
};
|
|
|
|
_.bindAll(view, ['onClick']);
|
|
jQuery(element).on('click', view.onClick);
|
|
// => Logs 'clicked docs' when clicked.
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_condpairs"></a>`_.cond(pairs)`
|
|
<a href="#_condpairs">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14645 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.cond "See the npm package")
|
|
|
|
Creates a function that iterates over `pairs` and invokes the corresponding
|
|
function of the first predicate to return truthy. The predicate-function
|
|
pairs are invoked with the `this` binding and arguments of the created
|
|
function.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `pairs` *(Array)*: The predicate-function pairs.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new composite function.
|
|
|
|
#### Example
|
|
```js
|
|
var func = _.cond([
|
|
[_.matches({ 'a': 1 }), _.constant('matches A')],
|
|
[_.conforms({ 'b': _.isNumber }), _.constant('matches B')],
|
|
[_.constant(true), _.constant('no match')]
|
|
]);
|
|
|
|
func({ 'a': 1, 'b': 2 });
|
|
// => 'matches A'
|
|
|
|
func({ 'a': 0, 'b': 1 });
|
|
// => 'matches B'
|
|
|
|
func({ 'a': '1', 'b': '2' });
|
|
// => 'no match'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_conformssource"></a>`_.conforms(source)`
|
|
<a href="#_conformssource">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14688 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.conforms "See the npm package")
|
|
|
|
Creates a function that invokes the predicate properties of `source` with
|
|
the corresponding property values of a given object, returning `true` if
|
|
all predicates return truthy, else `false`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `source` *(Object)*: The object of property predicates to conform to.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new spec function.
|
|
|
|
#### Example
|
|
```js
|
|
var users = [
|
|
{ 'user': 'barney', 'age': 36 },
|
|
{ 'user': 'fred', 'age': 40 }
|
|
];
|
|
|
|
_.filter(users, _.conforms({ 'age': function(n) { return n > 38; } }));
|
|
// => [{ 'user': 'fred', 'age': 40 }]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_constantvalue"></a>`_.constant(value)`
|
|
<a href="#_constantvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14711 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.constant "See the npm package")
|
|
|
|
Creates a function that returns `value`.
|
|
|
|
#### Since
|
|
2.4.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to return from the new function.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new constant function.
|
|
|
|
#### Example
|
|
```js
|
|
var objects = _.times(2, _.constant({ 'a': 1 }));
|
|
|
|
console.log(objects);
|
|
// => [{ 'a': 1 }, { 'a': 1 }]
|
|
|
|
console.log(objects[0] === objects[1]);
|
|
// => true
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_flowfuncs"></a>`_.flow([funcs])`
|
|
<a href="#_flowfuncs">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14739 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.flow "See the npm package")
|
|
|
|
Creates a function that returns the result of invoking the given functions
|
|
with the `this` binding of the created function, where each successive
|
|
invocation is supplied the return value of the previous.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `[funcs]` *(...(Function|Function[]))*: Functions to invoke.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new composite function.
|
|
|
|
#### Example
|
|
```js
|
|
function square(n) {
|
|
return n * n;
|
|
}
|
|
|
|
var addSquare = _.flow([_.add, square]);
|
|
addSquare(1, 2);
|
|
// => 9
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_flowrightfuncs"></a>`_.flowRight([funcs])`
|
|
<a href="#_flowrightfuncs">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14762 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.flowright "See the npm package")
|
|
|
|
This method is like `_.flow` except that it creates a function that
|
|
invokes the given functions from right to left.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `[funcs]` *(...(Function|Function[]))*: Functions to invoke.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new composite function.
|
|
|
|
#### Example
|
|
```js
|
|
function square(n) {
|
|
return n * n;
|
|
}
|
|
|
|
var addSquare = _.flowRight([square, _.add]);
|
|
addSquare(1, 2);
|
|
// => 9
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_identityvalue"></a>`_.identity(value)`
|
|
<a href="#_identityvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14780 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.identity "See the npm package")
|
|
|
|
This method returns the first argument given to it.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `value` *(*)*: Any value.
|
|
|
|
#### Returns
|
|
*(*)*: Returns `value`.
|
|
|
|
#### Example
|
|
```js
|
|
var object = { 'user': 'fred' };
|
|
|
|
console.log(_.identity(object) === object);
|
|
// => true
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_iterateefunc_identity"></a>`_.iteratee([func=_.identity])`
|
|
<a href="#_iterateefunc_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14826 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.iteratee "See the npm package")
|
|
|
|
Creates a function that invokes `func` with the arguments of the created
|
|
function. If `func` is a property name, the created function returns the
|
|
property value for a given element. If `func` is an array or object, the
|
|
created function returns `true` for elements that contain the equivalent
|
|
source properties, otherwise it returns `false`.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[func=_.identity]` *(*)*: The value to convert to a callback.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the callback.
|
|
|
|
#### Example
|
|
```js
|
|
var users = [
|
|
{ 'user': 'barney', 'age': 36, 'active': true },
|
|
{ 'user': 'fred', 'age': 40, 'active': false }
|
|
];
|
|
|
|
// The `_.matches` iteratee shorthand.
|
|
_.filter(users, _.iteratee({ 'user': 'barney', 'active': true }));
|
|
// => [{ 'user': 'barney', 'age': 36, 'active': true }]
|
|
|
|
// The `_.matchesProperty` iteratee shorthand.
|
|
_.filter(users, _.iteratee(['user', 'fred']));
|
|
// => [{ 'user': 'fred', 'age': 40 }]
|
|
|
|
// The `_.property` iteratee shorthand.
|
|
_.map(users, _.iteratee('user'));
|
|
// => ['barney', 'fred']
|
|
|
|
// Create custom iteratee shorthands.
|
|
_.iteratee = _.wrap(_.iteratee, function(iteratee, func) {
|
|
return !_.isRegExp(func) ? iteratee(func) : function(string) {
|
|
return func.test(string);
|
|
};
|
|
});
|
|
|
|
_.filter(['abc', 'def'], /ef/);
|
|
// => ['def']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_matchessource"></a>`_.matches(source)`
|
|
<a href="#_matchessource">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14854 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.matches "See the npm package")
|
|
|
|
Creates a function that performs a partial deep comparison between a given
|
|
object and `source`, returning `true` if the given object has equivalent
|
|
property values, else `false`. The created function is equivalent to
|
|
`_.isMatch` with a `source` partially applied.
|
|
<br>
|
|
<br>
|
|
**Note:** This method supports comparing the same values as `_.isEqual`.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `source` *(Object)*: The object of property values to match.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new spec function.
|
|
|
|
#### Example
|
|
```js
|
|
var users = [
|
|
{ 'user': 'barney', 'age': 36, 'active': true },
|
|
{ 'user': 'fred', 'age': 40, 'active': false }
|
|
];
|
|
|
|
_.filter(users, _.matches({ 'age': 40, 'active': false }));
|
|
// => [{ 'user': 'fred', 'age': 40, 'active': false }]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_matchespropertypath-srcvalue"></a>`_.matchesProperty(path, srcValue)`
|
|
<a href="#_matchespropertypath-srcvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14882 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.matchesproperty "See the npm package")
|
|
|
|
Creates a function that performs a partial deep comparison between the
|
|
value at `path` of a given object to `srcValue`, returning `true` if the
|
|
object value is equivalent, else `false`.
|
|
<br>
|
|
<br>
|
|
**Note:** This method supports comparing the same values as `_.isEqual`.
|
|
|
|
#### Since
|
|
3.2.0
|
|
#### Arguments
|
|
1. `path` *(Array|string)*: The path of the property to get.
|
|
2. `srcValue` *(*)*: The value to match.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new spec function.
|
|
|
|
#### Example
|
|
```js
|
|
var users = [
|
|
{ 'user': 'barney' },
|
|
{ 'user': 'fred' }
|
|
];
|
|
|
|
_.find(users, _.matchesProperty('user', 'fred'));
|
|
// => { 'user': 'fred' }
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_methodpath-args"></a>`_.method(path, [args])`
|
|
<a href="#_methodpath-args">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14910 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.method "See the npm package")
|
|
|
|
Creates a function that invokes the method at `path` of a given object.
|
|
Any additional arguments are provided to the invoked method.
|
|
|
|
#### Since
|
|
3.7.0
|
|
#### Arguments
|
|
1. `path` *(Array|string)*: The path of the method to invoke.
|
|
2. `[args]` *(...*)*: The arguments to invoke the method with.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new invoker function.
|
|
|
|
#### Example
|
|
```js
|
|
var objects = [
|
|
{ 'a': { 'b': _.constant(2) } },
|
|
{ 'a': { 'b': _.constant(1) } }
|
|
];
|
|
|
|
_.map(objects, _.method('a.b'));
|
|
// => [2, 1]
|
|
|
|
_.map(objects, _.method(['a', 'b']));
|
|
// => [2, 1]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_methodofobject-args"></a>`_.methodOf(object, [args])`
|
|
<a href="#_methodofobject-args">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14939 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.methodof "See the npm package")
|
|
|
|
The opposite of `_.method`; this method creates a function that invokes
|
|
the method at a given path of `object`. Any additional arguments are
|
|
provided to the invoked method.
|
|
|
|
#### Since
|
|
3.7.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to query.
|
|
2. `[args]` *(...*)*: The arguments to invoke the method with.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new invoker function.
|
|
|
|
#### Example
|
|
```js
|
|
var array = _.times(3, _.constant),
|
|
object = { 'a': array, 'b': array, 'c': array };
|
|
|
|
_.map(['a[2]', 'c[0]'], _.methodOf(object));
|
|
// => [2, 0]
|
|
|
|
_.map([['a', '2'], ['c', '0']], _.methodOf(object));
|
|
// => [2, 0]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_mixinobjectlodash-source-options-optionschaintrue"></a>`_.mixin([object=lodash], source, [options={}], [options.chain=true])`
|
|
<a href="#_mixinobjectlodash-source-options-optionschaintrue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L14981 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.mixin "See the npm package")
|
|
|
|
Adds all own enumerable string keyed function properties of a source
|
|
object to the destination object. If `object` is a function, then methods
|
|
are added to its prototype as well.
|
|
<br>
|
|
<br>
|
|
**Note:** Use `_.runInContext` to create a pristine `lodash` function to
|
|
avoid conflicts caused by modifying the original.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `[object=lodash]` *(Function|Object)*: The destination object.
|
|
2. `source` *(Object)*: The object of functions to add.
|
|
3. `[options={}]` *(Object)*: The options object.
|
|
4. `[options.chain=true]` *(boolean)*: Specify whether mixins are chainable.
|
|
|
|
#### Returns
|
|
*(*)*: Returns `object`.
|
|
|
|
#### Example
|
|
```js
|
|
function vowels(string) {
|
|
return _.filter(string, function(v) {
|
|
return /[aeiou]/i.test(v);
|
|
});
|
|
}
|
|
|
|
_.mixin({ 'vowels': vowels });
|
|
_.vowels('fred');
|
|
// => ['e']
|
|
|
|
_('fred').vowels().value();
|
|
// => ['e']
|
|
|
|
_.mixin({ 'vowels': vowels }, { 'chain': false });
|
|
_('fred').vowels();
|
|
// => ['e']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_noconflict"></a>`_.noConflict()`
|
|
<a href="#_noconflict">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15030 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.noconflict "See the npm package")
|
|
|
|
Reverts the `_` variable to its previous value and returns a reference to
|
|
the `lodash` function.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Returns
|
|
*(Function)*: Returns the `lodash` function.
|
|
|
|
#### Example
|
|
```js
|
|
var lodash = _.noConflict();
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_noop"></a>`_.noop()`
|
|
<a href="#_noop">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15049 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.noop "See the npm package")
|
|
|
|
A method that returns `undefined`.
|
|
|
|
#### Since
|
|
2.3.0
|
|
#### Example
|
|
```js
|
|
_.times(2, _.noop);
|
|
// => [undefined, undefined]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_nthargn0"></a>`_.nthArg([n=0])`
|
|
<a href="#_nthargn0">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15073 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.ntharg "See the npm package")
|
|
|
|
Creates a function that gets the argument at index `n`. If `n` is negative,
|
|
the nth argument from the end is returned.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[n=0]` *(number)*: The index of the argument to return.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new pass-thru function.
|
|
|
|
#### Example
|
|
```js
|
|
var func = _.nthArg(1);
|
|
func('a', 'b', 'c', 'd');
|
|
// => 'b'
|
|
|
|
var func = _.nthArg(-2);
|
|
func('a', 'b', 'c', 'd');
|
|
// => 'c'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_overiteratees_identity"></a>`_.over([iteratees=[_.identity]])`
|
|
<a href="#_overiteratees_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15098 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.over "See the npm package")
|
|
|
|
Creates a function that invokes `iteratees` with the arguments it receives
|
|
and returns their results.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[iteratees=[_.identity]]` *(...(Array|Array[]|Function|Function[]|Object|Object[]|string|string[]))*: The iteratees to invoke.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new function.
|
|
|
|
#### Example
|
|
```js
|
|
var func = _.over([Math.max, Math.min]);
|
|
|
|
func(1, 2, 3, 4);
|
|
// => [4, 1]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_overeverypredicates_identity"></a>`_.overEvery([predicates=[_.identity]])`
|
|
<a href="#_overeverypredicates_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15124 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.overevery "See the npm package")
|
|
|
|
Creates a function that checks if **all** of the `predicates` return
|
|
truthy when invoked with the arguments it receives.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[predicates=[_.identity]]` *(...(Array|Array[]|Function|Function[]|Object|Object[]|string|string[]))*: The predicates to check.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new function.
|
|
|
|
#### Example
|
|
```js
|
|
var func = _.overEvery([Boolean, isFinite]);
|
|
|
|
func('1');
|
|
// => true
|
|
|
|
func(null);
|
|
// => false
|
|
|
|
func(NaN);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_oversomepredicates_identity"></a>`_.overSome([predicates=[_.identity]])`
|
|
<a href="#_oversomepredicates_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15150 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.oversome "See the npm package")
|
|
|
|
Creates a function that checks if **any** of the `predicates` return
|
|
truthy when invoked with the arguments it receives.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[predicates=[_.identity]]` *(...(Array|Array[]|Function|Function[]|Object|Object[]|string|string[]))*: The predicates to check.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new function.
|
|
|
|
#### Example
|
|
```js
|
|
var func = _.overSome([Boolean, isFinite]);
|
|
|
|
func('1');
|
|
// => true
|
|
|
|
func(null);
|
|
// => true
|
|
|
|
func(NaN);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_propertypath"></a>`_.property(path)`
|
|
<a href="#_propertypath">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15174 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.property "See the npm package")
|
|
|
|
Creates a function that returns the value at `path` of a given object.
|
|
|
|
#### Since
|
|
2.4.0
|
|
#### Arguments
|
|
1. `path` *(Array|string)*: The path of the property to get.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new accessor function.
|
|
|
|
#### Example
|
|
```js
|
|
var objects = [
|
|
{ 'a': { 'b': 2 } },
|
|
{ 'a': { 'b': 1 } }
|
|
];
|
|
|
|
_.map(objects, _.property('a.b'));
|
|
// => [2, 1]
|
|
|
|
_.map(_.sortBy(objects, _.property(['a', 'b'])), 'a.b');
|
|
// => [1, 2]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_propertyofobject"></a>`_.propertyOf(object)`
|
|
<a href="#_propertyofobject">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15199 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.propertyof "See the npm package")
|
|
|
|
The opposite of `_.property`; this method creates a function that returns
|
|
the value at a given path of `object`.
|
|
|
|
#### Since
|
|
3.0.0
|
|
#### Arguments
|
|
1. `object` *(Object)*: The object to query.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns the new accessor function.
|
|
|
|
#### Example
|
|
```js
|
|
var array = [0, 1, 2],
|
|
object = { 'a': array, 'b': array, 'c': array };
|
|
|
|
_.map(['a[2]', 'c[0]'], _.propertyOf(object));
|
|
// => [2, 0]
|
|
|
|
_.map([['a', '2'], ['c', '0']], _.propertyOf(object));
|
|
// => [2, 0]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_rangestart0-end-step1"></a>`_.range([start=0], end, [step=1])`
|
|
<a href="#_rangestart0-end-step1">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15246 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.range "See the npm package")
|
|
|
|
Creates an array of numbers *(positive and/or negative)* progressing from
|
|
`start` up to, but not including, `end`. A step of `-1` is used if a negative
|
|
`start` is specified without an `end` or `step`. If `end` is not specified,
|
|
it's set to `start` with `start` then set to `0`.
|
|
<br>
|
|
<br>
|
|
**Note:** JavaScript follows the IEEE-754 standard for resolving
|
|
floating-point values which can produce unexpected results.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `[start=0]` *(number)*: The start of the range.
|
|
2. `end` *(number)*: The end of the range.
|
|
3. `[step=1]` *(number)*: The value to increment or decrement by.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the range of numbers.
|
|
|
|
#### Example
|
|
```js
|
|
_.range(4);
|
|
// => [0, 1, 2, 3]
|
|
|
|
_.range(-4);
|
|
// => [0, -1, -2, -3]
|
|
|
|
_.range(1, 5);
|
|
// => [1, 2, 3, 4]
|
|
|
|
_.range(0, 20, 5);
|
|
// => [0, 5, 10, 15]
|
|
|
|
_.range(0, -4, -1);
|
|
// => [0, -1, -2, -3]
|
|
|
|
_.range(1, 4, 0);
|
|
// => [1, 1, 1]
|
|
|
|
_.range(0);
|
|
// => []
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_rangerightstart0-end-step1"></a>`_.rangeRight([start=0], end, [step=1])`
|
|
<a href="#_rangerightstart0-end-step1">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15284 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.rangeright "See the npm package")
|
|
|
|
This method is like `_.range` except that it populates values in
|
|
descending order.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `[start=0]` *(number)*: The start of the range.
|
|
2. `end` *(number)*: The end of the range.
|
|
3. `[step=1]` *(number)*: The value to increment or decrement by.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the range of numbers.
|
|
|
|
#### Example
|
|
```js
|
|
_.rangeRight(4);
|
|
// => [3, 2, 1, 0]
|
|
|
|
_.rangeRight(-4);
|
|
// => [-3, -2, -1, 0]
|
|
|
|
_.rangeRight(1, 5);
|
|
// => [4, 3, 2, 1]
|
|
|
|
_.rangeRight(0, 20, 5);
|
|
// => [15, 10, 5, 0]
|
|
|
|
_.rangeRight(0, -4, -1);
|
|
// => [-3, -2, -1, 0]
|
|
|
|
_.rangeRight(1, 4, 0);
|
|
// => [1, 1, 1]
|
|
|
|
_.rangeRight(0);
|
|
// => []
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_runincontextcontextroot"></a>`_.runInContext([context=root])`
|
|
<a href="#_runincontextcontextroot">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L1234 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.runincontext "See the npm package")
|
|
|
|
Create a new pristine `lodash` function using the `context` object.
|
|
|
|
#### Since
|
|
1.1.0
|
|
#### Arguments
|
|
1. `[context=root]` *(Object)*: The context object.
|
|
|
|
#### Returns
|
|
*(Function)*: Returns a new `lodash` function.
|
|
|
|
#### Example
|
|
```js
|
|
_.mixin({ 'foo': _.constant('foo') });
|
|
|
|
var lodash = _.runInContext();
|
|
lodash.mixin({ 'bar': lodash.constant('bar') });
|
|
|
|
_.isFunction(_.foo);
|
|
// => true
|
|
_.isFunction(_.bar);
|
|
// => false
|
|
|
|
lodash.isFunction(lodash.foo);
|
|
// => false
|
|
lodash.isFunction(lodash.bar);
|
|
// => true
|
|
|
|
// Use `context` to stub `Date#getTime` use in `_.now`.
|
|
var stubbed = _.runInContext({
|
|
'Date': function() {
|
|
return { 'getTime': stubGetTime };
|
|
}
|
|
});
|
|
|
|
// Create a suped-up `defer` in Node.js.
|
|
var defer = _.runInContext({ 'setTimeout': setImmediate }).defer;
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_stubarray"></a>`_.stubArray()`
|
|
<a href="#_stubarray">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15304 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.stubarray "See the npm package")
|
|
|
|
A method that returns a new empty array.
|
|
|
|
#### Since
|
|
4.13.0
|
|
#### Returns
|
|
*(Array)*: Returns the new empty array.
|
|
|
|
#### Example
|
|
```js
|
|
var arrays = _.times(2, _.stubArray);
|
|
|
|
console.log(arrays);
|
|
// => [[], []]
|
|
|
|
console.log(arrays[0] === arrays[1]);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_stubfalse"></a>`_.stubFalse()`
|
|
<a href="#_stubfalse">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15321 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.stubfalse "See the npm package")
|
|
|
|
A method that returns `false`.
|
|
|
|
#### Since
|
|
4.13.0
|
|
#### Returns
|
|
*(boolean)*: Returns `false`.
|
|
|
|
#### Example
|
|
```js
|
|
_.times(2, _.stubFalse);
|
|
// => [false, false]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_stubobject"></a>`_.stubObject()`
|
|
<a href="#_stubobject">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15343 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.stubobject "See the npm package")
|
|
|
|
A method that returns a new empty object.
|
|
|
|
#### Since
|
|
4.13.0
|
|
#### Returns
|
|
*(Object)*: Returns the new empty object.
|
|
|
|
#### Example
|
|
```js
|
|
var objects = _.times(2, _.stubObject);
|
|
|
|
console.log(objects);
|
|
// => [{}, {}]
|
|
|
|
console.log(objects[0] === objects[1]);
|
|
// => false
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_stubstring"></a>`_.stubString()`
|
|
<a href="#_stubstring">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15360 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.stubstring "See the npm package")
|
|
|
|
A method that returns an empty string.
|
|
|
|
#### Since
|
|
4.13.0
|
|
#### Returns
|
|
*(string)*: Returns the empty string.
|
|
|
|
#### Example
|
|
```js
|
|
_.times(2, _.stubString);
|
|
// => ['', '']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_stubtrue"></a>`_.stubTrue()`
|
|
<a href="#_stubtrue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15377 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.stubtrue "See the npm package")
|
|
|
|
A method that returns `true`.
|
|
|
|
#### Since
|
|
4.13.0
|
|
#### Returns
|
|
*(boolean)*: Returns `true`.
|
|
|
|
#### Example
|
|
```js
|
|
_.times(2, _.stubTrue);
|
|
// => [true, true]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_timesn-iteratee_identity"></a>`_.times(n, [iteratee=_.identity])`
|
|
<a href="#_timesn-iteratee_identity">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15400 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.times "See the npm package")
|
|
|
|
Invokes the iteratee `n` times, returning an array of the results of
|
|
each invocation. The iteratee is invoked with one argument; *(index)*.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `n` *(number)*: The number of times to invoke `iteratee`.
|
|
2. `[iteratee=_.identity]` *(Function)*: The function invoked per iteration.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the array of results.
|
|
|
|
#### Example
|
|
```js
|
|
_.times(3, String);
|
|
// => ['0', '1', '2']
|
|
|
|
_.times(4, _.constant(0));
|
|
// => [0, 0, 0, 0]
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_topathvalue"></a>`_.toPath(value)`
|
|
<a href="#_topathvalue">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15435 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.topath "See the npm package")
|
|
|
|
Converts `value` to a property path array.
|
|
|
|
#### Since
|
|
4.0.0
|
|
#### Arguments
|
|
1. `value` *(*)*: The value to convert.
|
|
|
|
#### Returns
|
|
*(Array)*: Returns the new property path array.
|
|
|
|
#### Example
|
|
```js
|
|
_.toPath('a.b.c');
|
|
// => ['a', 'b', 'c']
|
|
|
|
_.toPath('a[0].b.c');
|
|
// => ['a', '0', 'b', 'c']
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_uniqueidprefix"></a>`_.uniqueId([prefix=''])`
|
|
<a href="#_uniqueidprefix">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L15459 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.uniqueid "See the npm package")
|
|
|
|
Generates a unique ID. If `prefix` is given, the ID is appended to it.
|
|
|
|
#### Since
|
|
0.1.0
|
|
#### Arguments
|
|
1. `[prefix='']` *(string)*: The value to prefix the ID with.
|
|
|
|
#### Returns
|
|
*(string)*: Returns the unique ID.
|
|
|
|
#### Example
|
|
```js
|
|
_.uniqueId('contact_');
|
|
// => 'contact_104'
|
|
|
|
_.uniqueId();
|
|
// => '105'
|
|
```
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
## `Properties`
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_version"></a>`_.VERSION`
|
|
<a href="#_version">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L16152 "View in source") [Ⓣ][1]
|
|
|
|
(string): The semantic version number.
|
|
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_templatesettings"></a>`_.templateSettings`
|
|
<a href="#_templatesettings">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L1509 "View in source") [Ⓣ][1] [Ⓝ](https://www.npmjs.com/package/lodash.templatesettings "See the npm package")
|
|
|
|
(Object): By default, the template delimiters used by lodash are like those in
|
|
embedded Ruby *(ERB)*. Change the following template settings to use
|
|
alternative delimiters.
|
|
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_templatesettingsescape"></a>`_.templateSettings.escape`
|
|
<a href="#_templatesettingsescape">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L1517 "View in source") [Ⓣ][1]
|
|
|
|
(RegExp): Used to detect `data` property values to be HTML-escaped.
|
|
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_templatesettingsevaluate"></a>`_.templateSettings.evaluate`
|
|
<a href="#_templatesettingsevaluate">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L1525 "View in source") [Ⓣ][1]
|
|
|
|
(RegExp): Used to detect code to be evaluated.
|
|
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_templatesettingsimports"></a>`_.templateSettings.imports`
|
|
<a href="#_templatesettingsimports">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L1549 "View in source") [Ⓣ][1]
|
|
|
|
(Object): Used to import variables into the compiled template.
|
|
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_templatesettingsinterpolate"></a>`_.templateSettings.interpolate`
|
|
<a href="#_templatesettingsinterpolate">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L1533 "View in source") [Ⓣ][1]
|
|
|
|
(RegExp): Used to detect `data` property values to inject.
|
|
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_templatesettingsvariable"></a>`_.templateSettings.variable`
|
|
<a href="#_templatesettingsvariable">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L1541 "View in source") [Ⓣ][1]
|
|
|
|
(string): Used to reference the data object in the template text.
|
|
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- div -->
|
|
|
|
## `Methods`
|
|
|
|
<!-- div -->
|
|
|
|
### <a id="_templatesettingsimports_"></a>`_.templateSettings.imports._`
|
|
<a href="#_templatesettingsimports_">#</a> [Ⓢ](https://github.com/lodash/lodash/blob/4.13.1/lodash.js#L1557 "View in source") [Ⓣ][1]
|
|
|
|
A reference to the `lodash` function.
|
|
|
|
* * *
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- /div -->
|
|
|
|
<!-- /div -->
|
|
|
|
[1]: #array "Jump back to the TOC."
|