has_arguments_bug.js (1393B)
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( './builtin.js' ); 24 25 26 // FUNCTIONS // 27 28 /** 29 * Tests the built-in `Object.keys()` implementation when provided `arguments`. 30 * 31 * @private 32 * @returns {boolean} boolean indicating whether the built-in implementation returns the expected number of keys 33 */ 34 function test() { 35 return ( keys( arguments ) || '' ).length !== 2; 36 } 37 38 39 // MAIN // 40 41 /** 42 * Tests whether the built-in `Object.keys()` implementation supports providing `arguments` as an input value. 43 * 44 * ## Notes 45 * 46 * - Safari 5.0 does **not** support `arguments` as an input value. 47 * 48 * @private 49 * @returns {boolean} boolean indicating whether a built-in implementation supports `arguments` 50 */ 51 function check() { 52 return test( 1, 2 ); 53 } 54 55 56 // EXPORTS // 57 58 module.exports = check;