README.md (2232B)
1 <!-- 2 3 @license Apache-2.0 4 5 Copyright (c) 2018 The Stdlib Authors. 6 7 Licensed under the Apache License, Version 2.0 (the "License"); 8 you may not use this file except in compliance with the License. 9 You may obtain a copy of the License at 10 11 http://www.apache.org/licenses/LICENSE-2.0 12 13 Unless required by applicable law or agreed to in writing, software 14 distributed under the License is distributed on an "AS IS" BASIS, 15 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 See the License for the specific language governing permissions and 17 limitations under the License. 18 19 --> 20 21 # isIteratorLike 22 23 > Test if a value is [`iterator`][mdn-iterator-protocol]-like. 24 25 <section class="usage"> 26 27 ## Usage 28 29 ```javascript 30 var isIteratorLike = require( '@stdlib/assert/is-iterator-like' ); 31 ``` 32 33 #### isIteratorLike( value ) 34 35 Tests if a `value` is [`iterator`][mdn-iterator-protocol]-like. 36 37 <!-- eslint-disable no-restricted-syntax, no-empty-function --> 38 39 ```javascript 40 var obj = { 41 'next': function noop() {} 42 }; 43 var bool = isIteratorLike( obj ); 44 // returns true 45 46 bool = isIteratorLike( {} ); 47 // returns false 48 ``` 49 50 </section> 51 52 <!-- /.usage --> 53 54 <section class="notes"> 55 56 ## Notes 57 58 - An [iterator protocol-compliant object][mdn-iterator-protocol] is an `object` having a `next` method following the [iterator protocol][mdn-iterator-protocol]. 59 - As full [iterator][mdn-iterator-protocol] compliance is **impossible** to achieve without evaluating an [iterator][mdn-iterator-protocol], this function checks **only** for interface compliance. 60 61 </section> 62 63 <!-- /.notes --> 64 65 <section class="examples"> 66 67 ## Examples 68 69 <!-- eslint no-undef: "error" --> 70 71 ```javascript 72 var noop = require( '@stdlib/utils/noop' ); 73 var isIteratorLike = require( '@stdlib/assert/is-iterator-like' ); 74 75 var obj = { 76 'next': noop 77 }; 78 var bool = isIteratorLike( obj ); 79 // returns true 80 81 bool = isIteratorLike( {} ); 82 // returns false 83 84 bool = isIteratorLike( [] ); 85 // returns false 86 87 bool = isIteratorLike( null ); 88 // returns false 89 ``` 90 91 </section> 92 93 <!-- /.examples --> 94 95 <section class="links"> 96 97 [mdn-iterator-protocol]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#The_iterator_protocol 98 99 </section> 100 101 <!-- /.links -->