lodash/lodash.mapkeys/index.js

/**
 * lodash 4.2.0 (Custom Build) <https://lodash.com/>
 * Build: `lodash modularize exports="npm" -o ./`
 * Copyright 2012-2016 The Dojo Foundation <http://dojofoundation.org/>
 * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
 * Copyright 2009-2016 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
 * Available under MIT license <https://lodash.com/license>
 */
var baseFor = require('lodash._basefor'),
    baseIteratee = require('lodash._baseiteratee'),
    keys = require('lodash.keys');

/**
 * The base implementation of `_.forOwn` without support for iteratee shorthands.
 *
 * @private
 * @param {Object} object The object to iterate over.
 * @param {Function} iteratee The function invoked per iteration.
 * @returns {Object} Returns `object`.
 */
function baseForOwn(object, iteratee) {
  return object && baseFor(object, iteratee, keys);
}

/**
 * The opposite of `_.mapValues`; this method creates an object with the
 * same values as `object` and keys generated by running each own enumerable
 * property of `object` through `iteratee`. The iteratee is invoked with
 * three arguments: (value, key, object).
 *
 * @static
 * @memberOf _
 * @category Object
 * @param {Object} object The object to iterate over.
 * @param {Function|Object|string} [iteratee=_.identity] The function invoked per iteration.
 * @returns {Object} Returns the new mapped object.
 * @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) {
    result[iteratee(value, key, object)] = value;
  });
  return result;
}

module.exports = mapKeys;