mapValues.js
 1  var baseAssignValue = require('./_baseAssignValue'),
 2      baseForOwn = require('./_baseForOwn'),
 3      baseIteratee = require('./_baseIteratee');
 4  
 5  /**
 6   * Creates an object with the same keys as `object` and values generated
 7   * by running each own enumerable string keyed property of `object` thru
 8   * `iteratee`. The iteratee is invoked with three arguments:
 9   * (value, key, object).
10   *
11   * @static
12   * @memberOf _
13   * @since 2.4.0
14   * @category Object
15   * @param {Object} object The object to iterate over.
16   * @param {Function} [iteratee=_.identity] The function invoked per iteration.
17   * @returns {Object} Returns the new mapped object.
18   * @see _.mapKeys
19   * @example
20   *
21   * var users = {
22   *   'fred':    { 'user': 'fred',    'age': 40 },
23   *   'pebbles': { 'user': 'pebbles', 'age': 1 }
24   * };
25   *
26   * _.mapValues(users, function(o) { return o.age; });
27   * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
28   *
29   * // The `_.property` iteratee shorthand.
30   * _.mapValues(users, 'age');
31   * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
32   */
33  function mapValues(object, iteratee) {
34    var result = {};
35    iteratee = baseIteratee(iteratee, 3);
36  
37    baseForOwn(object, function(value, key, object) {
38      baseAssignValue(result, key, iteratee(value, key, object));
39    });
40    return result;
41  }
42  
43  module.exports = mapValues;