githubmirror/lodash

mapKeys.js

35 строк1 KB

John-David Dalton

Bump to v4.16.0.

18 сен 2016, 08:24

18 сен 2016, 08:240b9ddff

define(['./_baseAssignValue', './_baseForOwn', './_baseIteratee'], function(baseAssignValue, baseForOwn, baseIteratee) {

  /**
   * The opposite of `_.mapValues`; this method creates an object with the
   * same values as `object` and keys generated by running each own enumerable
   * string keyed property of `object` thru `iteratee`. The iteratee is invoked
   * with three arguments: (value, key, object).
   *
   * @static
   * @memberOf _
   * @since 3.8.0
   * @category Object
   * @param {Object} object The object to iterate over.
   * @param {Function} [iteratee=_.identity] The function invoked per iteration.
   * @returns {Object} Returns the new mapped object.
   * @see _.mapValues
   * @example
   *
   * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) {
   *   return key + value;
   * });
   * // => { 'a1': 1, 'b2': 2 }
   */
  function mapKeys(object, iteratee) {
    var result = {};
    iteratee = baseIteratee(iteratee, 3);

    baseForOwn(object, function(value, key, object) {
      baseAssignValue(result, iteratee(value, key, object), value);
    });
    return result;
  }

  return mapKeys;
});