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69 lines
2.3 KiB
JavaScript
69 lines
2.3 KiB
JavaScript
9 years ago
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var arrayMap = require('../internal/arrayMap'),
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baseCallback = require('../internal/baseCallback'),
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baseMap = require('../internal/baseMap'),
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isArray = require('../lang/isArray');
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/**
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* Creates an array of values by running each element in `collection` through
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* `iteratee`. The `iteratee` is bound to `thisArg` and invoked with three
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* arguments: (value, index|key, collection).
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*
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* If a property name is provided for `iteratee` the created `_.property`
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* style callback returns the property value of the given element.
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*
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* If a value is also provided for `thisArg` the created `_.matchesProperty`
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* style callback returns `true` for elements that have a matching property
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* value, else `false`.
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*
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* If an object is provided for `iteratee` the created `_.matches` style
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* callback returns `true` for elements that have the properties of the given
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* object, else `false`.
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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`, `callback`, `chunk`, `clone`, `create`, `curry`, `curryRight`,
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* `drop`, `dropRight`, `every`, `fill`, `flatten`, `invert`, `max`, `min`,
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* `parseInt`, `slice`, `sortBy`, `take`, `takeRight`, `template`, `trim`,
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* `trimLeft`, `trimRight`, `trunc`, `random`, `range`, `sample`, `some`,
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* `sum`, `uniq`, and `words`
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*
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* @static
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* @memberOf _
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* @alias collect
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* @category Collection
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* @param {Array|Object|string} collection The collection to iterate over.
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* @param {Function|Object|string} [iteratee=_.identity] The function invoked
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* per iteration.
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* @param {*} [thisArg] The `this` binding of `iteratee`.
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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 timesThree(n) {
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* return n * 3;
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* }
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*
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* _.map([1, 2], timesThree);
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* // => [3, 6]
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*
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* _.map({ 'a': 1, 'b': 2 }, timesThree);
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* // => [3, 6] (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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* // using the `_.property` callback 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, thisArg) {
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var func = isArray(collection) ? arrayMap : baseMap;
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iteratee = baseCallback(iteratee, thisArg, 3);
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return func(collection, iteratee);
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}
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module.exports = map;
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