polyfill.js (1625B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 'use strict'; 20 21 // MODULES // 22 23 var keys = require( './../../keys' ); 24 25 26 // MAIN // 27 28 /** 29 * Returns an array of an object's own enumerable and non-enumerable property names. 30 * 31 * ## Notes 32 * 33 * - In contrast to the built-in `Object.getOwnPropertyNames()`, this function returns an empty array if provided `undefined` or `null`, rather than throwing an error. 34 * - In environments lacking support for `Object.getOwnPropertyNames()`, property descriptors are unavailable, and thus all properties can be safely assumed to be enumerable. Hence, we can defer to calling `Object.keys`, which retrieves all own enumerable property names. 35 * 36 * @private 37 * @param {*} value - input object 38 * @returns {Array} a list of own property names 39 * 40 * @example 41 * var obj = { 42 * 'beep': 'boop', 43 * 'foo': 3.14 44 * }; 45 * 46 * var keys = getOwnPropertyNames( obj ); 47 * // e.g., returns [ 'beep', 'foo' ] 48 */ 49 function getOwnPropertyNames( value ) { 50 return keys( Object( value ) ); 51 } 52 53 54 // EXPORTS // 55 56 module.exports = getOwnPropertyNames;