lodash underscore js库速查手册 Collection Functions (Ar

文件名称: lodash underscore js库速查手册

所属分类: Javascript

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文件大小: 56kb

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上传时间: 2019-04-04

提供者: lifeis******

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详细说明： Collection Functions (Arrays or Objects) _.each(list, iterator, [context]) Alias: forEach Iterates over a list of elements, yielding each in turn to an iterator function. The iterator is bound to the _.map(list, iterator, [context]) Alias: collect Produces a new array of values by mapping each value in list through a transformation function ( _.reduce(list, iterator, memo, [context]) Aliases: inject, foldl Also known as inject and foldl, reduce boils down a list of values into a single value. _.reduceRight(list, iterator, memo, [context]) Alias: foldr The right-associative version of reduce. Delegates to the JavaScript 1.8 version of _.find(list, iterator, [context]) Alias: detect Looks through each value in the list, returning the first one that passes a truth test (iterator). The function returns as _.filter(list, iterator, [context]) Alias: select Looks through each value in the list, returning an array of all the values that pass a truth test ( _.where(list, properties) Looks through each value in the list, returning an array of all the values that contain all of the key-value pairs listed in _.findWhere(list, properties) Looks through the list and returns the first value that matches all of the key-value pairs listed in properties. _.reject(list, iterator, [context]) Returns the values in list without the elements that the truth test (iterator) passes. The opposite of filter. _.every(list, iterator, [context]) Alias: all Returns true if all of the values in the list pass the iterator truth test. Delegates to the native method _.some(list, [iterator], [context]) Alias: any Returns true if any of the values in the list pass the iterator truth test. Short-circuits and stops traversing the list _.contains(list, value) Alias: include Returns true if the value is present in the list. Uses indexOf internally, if list is an Array. _.invoke(list, methodName, [*arguments]) Calls the method named by methodName on each value in the list. Any extra arguments passed to _.pluck(list, propertyName) A convenient version of what is perhaps the most common use-case for map: extracting a list of property values. _.max(list, [iterator], [context]) Returns the maximum value in list. If iterator is passed, it will be used on each value to generate the criterion by which the _.min(list, [iterator], [context]) Returns the minimum value in list. If iterator is passed, it will be used on each value to generate the criterion by which the _.sortBy(list, iterator, [context]) Returns a sorted copy of list, ranked in ascending order by the results of running each value through iterator _.groupBy(list, iterator, [context]) Splits a collection into sets, grouped by the result of running each value through iterator. If iterator is a string instead of _.countBy(list, iterator, [context]) Sorts a list into groups and returns a count for the number of objects in each group. Similar to groupBy _.shuffle(list) Returns a shuffled copy of the list, using a version of the Fisher-Yates shuffle. _.toArray(list) Converts the list (anything that can be iterated over), into a real Array. Useful for transmuting the arguments object. _.size(list) Return the number of values in the list.

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