Lodash - 集合

Lodash 拥有许多易于使用的方法，有助于处理集合。本章将详细讨论这些方法。

Lodash 提供各种方法来处理集合，如下所示：

序号	方法及语法
1	countBy _.countBy(collection, [iteratee=_.identity])
2	every _.every(collection, [predicate=_.identity])
3	filter _.filter(collection, [predicate=_.identity])
4	find _.find(collection, [predicate=_.identity], [fromIndex=0])
5	findLast _.findLast(collection, [predicate=_.identity], [fromIndex=collection.length-1])
6	flatMap _.flatMap(collection, [iteratee=_.identity])
7	flatMapDeep _.flatMapDeep(collection, [iteratee=_.identity])
8	flatMapDepth _.flatMapDepth(collection, [iteratee=_.identity], [depth=1])
9	forEach _.forEach(collection, [iteratee=_.identity])
10	forEachRight _.forEachRight(collection, [iteratee=_.identity])
11	groupBy _.groupBy(collection, [iteratee=_.identity])
12	includes _.includes(collection, value, [fromIndex=0])
13	invokeMap _.invokeMap(collection, path, [args])
14	keyBy _.keyBy(collection, [iteratee=_.identity])
15	map _.map(collection, [iteratee=_.identity])
16	orderBy _.orderBy(collection, [iteratees=[_.identity]], [orders])
17	partition _.partition(collection, [predicate=_.identity])
18	reduce _.reduce(collection, [iteratee=_.identity], [accumulator])
19	reduceRight _.reduceRight(collection, [iteratee=_.identity], [accumulator])
20	reject _.reject(collection, [predicate=_.identity])
21	sample _.sample(collection)
22	sampleSize _.sampleSize(collection, [n=1])
23	shuffle _.shuffle(collection)
24	size _.size(collection)
25	some _.some(collection, [predicate=_.identity])
26	sortBy _.sortBy(collection, [iteratees=[_.identity]])

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