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54 lines
1.6 KiB
JavaScript
54 lines
1.6 KiB
JavaScript
5 years ago
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var arrayMap = require('./_arrayMap'),
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baseIteratee = require('./_baseIteratee'),
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baseMap = require('./_baseMap'),
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isArray = require('./isArray');
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/**
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* Creates an array of values by running each element in `collection` thru
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* `iteratee`. The iteratee is invoked with three arguments:
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* (value, index|key, collection).
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*
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* Many lodash methods are guarded to work as iteratees for methods like
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* `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.
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*
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* The guarded methods are:
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* `ary`, `chunk`, `curry`, `curryRight`, `drop`, `dropRight`, `every`,
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* `fill`, `invert`, `parseInt`, `random`, `range`, `rangeRight`, `repeat`,
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* `sampleSize`, `slice`, `some`, `sortBy`, `split`, `take`, `takeRight`,
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* `template`, `trim`, `trimEnd`, `trimStart`, and `words`
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*
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* @static
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* @memberOf _
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* @since 0.1.0
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* @category Collection
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* @param {Array|Object} collection The collection to iterate over.
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* @param {Function} [iteratee=_.identity] The function invoked per iteration.
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* @returns {Array} Returns the new mapped array.
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* @example
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*
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* function square(n) {
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* return n * n;
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* }
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*
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* _.map([4, 8], square);
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* // => [16, 64]
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*
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* _.map({ 'a': 4, 'b': 8 }, square);
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* // => [16, 64] (iteration order is not guaranteed)
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*
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* var users = [
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* { 'user': 'barney' },
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* { 'user': 'fred' }
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* ];
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*
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* // The `_.property` iteratee shorthand.
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* _.map(users, 'user');
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* // => ['barney', 'fred']
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*/
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function map(collection, iteratee) {
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var func = isArray(collection) ? arrayMap : baseMap;
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return func(collection, baseIteratee(iteratee, 3));
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}
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module.exports = map;
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