main.js (1203B)
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 hasOwnProp = require( './../../has-own-property' ); 24 25 26 // MAIN // 27 28 /** 29 * Tests for native `Symbol.iterator` support. 30 * 31 * @returns {boolean} boolean indicating if an environment has `Symbol.iterator` support 32 * 33 * @example 34 * var bool = hasIteratorSymbolSupport(); 35 * // returns <boolean> 36 */ 37 function hasIteratorSymbolSupport() { 38 return ( 39 typeof Symbol === 'function' && 40 typeof Symbol( 'foo' ) === 'symbol' && 41 hasOwnProp( Symbol, 'iterator' ) && 42 typeof Symbol.iterator === 'symbol' 43 ); 44 } 45 46 47 // EXPORTS // 48 49 module.exports = hasIteratorSymbolSupport;