pickBy.js (1032B)
1 var arrayMap = require('./_arrayMap'), 2 baseIteratee = require('./_baseIteratee'), 3 basePickBy = require('./_basePickBy'), 4 getAllKeysIn = require('./_getAllKeysIn'); 5 6 /** 7 * Creates an object composed of the `object` properties `predicate` returns 8 * truthy for. The predicate is invoked with two arguments: (value, key). 9 * 10 * @static 11 * @memberOf _ 12 * @since 4.0.0 13 * @category Object 14 * @param {Object} object The source object. 15 * @param {Function} [predicate=_.identity] The function invoked per property. 16 * @returns {Object} Returns the new object. 17 * @example 18 * 19 * var object = { 'a': 1, 'b': '2', 'c': 3 }; 20 * 21 * _.pickBy(object, _.isNumber); 22 * // => { 'a': 1, 'c': 3 } 23 */ 24 function pickBy(object, predicate) { 25 if (object == null) { 26 return {}; 27 } 28 var props = arrayMap(getAllKeysIn(object), function(prop) { 29 return [prop]; 30 }); 31 predicate = baseIteratee(predicate); 32 return basePickBy(object, props, function(value, path) { 33 return predicate(value, path[0]); 34 }); 35 } 36 37 module.exports = pickBy;