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map.js
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define(['../internal/arrayMap', '../internal/baseCallback', '../internal/baseMap', '../lang/isArray'], function(arrayMap, baseCallback, baseMap, isArray) {
/**
* Creates an array of values by running each element in `collection` through
* `iteratee`. The `iteratee` is bound to `thisArg` and invoked with three
* arguments; (value, index|key, collection).
*
* If a property name is provided for `predicate` the created "_.property"
* style callback returns the property value of the given element.
*
* If an object is provided for `predicate` the created "_.matches" style
* callback returns `true` for elements that have the properties of the given
* object, else `false`.
*
* @static
* @memberOf _
* @alias collect
* @category Collection
* @param {Array|Object|string} collection The collection to iterate over.
* @param {Function|Object|string} [iteratee=_.identity] The function invoked
* per iteration. If a property name or object is provided it is used to
* create a "_.property" or "_.matches" style callback respectively.
* @param {*} [thisArg] The `this` binding of `iteratee`.
* @returns {Array} Returns the new mapped array.
* @example
*
* _.map([1, 2, 3], function(n) { return n * 3; });
* // => [3, 6, 9]
*
* _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(n) { return n * 3; });
* // => [3, 6, 9] (iteration order is not guaranteed)
*
* var users = [
* { 'user': 'barney' },
* { 'user': 'fred' }
* ];
*
* // using the "_.property" callback shorthand
* _.map(users, 'user');
* // => ['barney', 'fred']
*/
function map(collection, iteratee, thisArg) {
var func = isArray(collection) ? arrayMap : baseMap;
iteratee = baseCallback(iteratee, thisArg, 3);
return func(collection, iteratee);
}
return map;
});