mapKeys.js (1097B)
1 var baseAssignValue = require('./_baseAssignValue'), 2 baseForOwn = require('./_baseForOwn'), 3 baseIteratee = require('./_baseIteratee'); 4 5 /** 6 * The opposite of `_.mapValues`; this method creates an object with the 7 * same values as `object` and keys generated by running each own enumerable 8 * string keyed property of `object` thru `iteratee`. The iteratee is invoked 9 * with three arguments: (value, key, object). 10 * 11 * @static 12 * @memberOf _ 13 * @since 3.8.0 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 _.mapValues 19 * @example 20 * 21 * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) { 22 * return key + value; 23 * }); 24 * // => { 'a1': 1, 'b2': 2 } 25 */ 26 function mapKeys(object, iteratee) { 27 var result = {}; 28 iteratee = baseIteratee(iteratee, 3); 29 30 baseForOwn(object, function(value, key, object) { 31 baseAssignValue(result, iteratee(value, key, object), value); 32 }); 33 return result; 34 } 35 36 module.exports = mapKeys;