mapValues.js (1338B)
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;