README.md (2136B)
1 <!-- 2 3 @license Apache-2.0 4 5 Copyright (c) 2021 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 # isArrowFunction 22 23 > Test if a value is an [`arrow function`][mdn-arrow-function]. 24 25 <section class="usage"> 26 27 ## Usage 28 29 ```javascript 30 var isArrowFunction = require( '@stdlib/assert/is-arrow-function' ); 31 ``` 32 33 #### isArrowFunction( value ) 34 35 Tests if a `value` is a an [`arrow function`][mdn-arrow-function] such as `( a, b ) => a + b`, `x => x`, or `( x ) => { return x*x; }`. 36 37 <!-- eslint-disable func-style, no-restricted-syntax --> 38 39 ```javascript 40 var beep = () => { 41 console.log( 'beep' ); 42 }; 43 44 var bool = isArrowFunction( beep ); 45 // returns true 46 47 function boop() { 48 console.log( 'boop' ); 49 } 50 51 bool = isArrowFunction( boop ); 52 // returns false 53 ``` 54 55 </section> 56 57 <!-- /.usage --> 58 59 <section class="examples"> 60 61 ## Examples 62 63 <!-- eslint-disable func-style, no-restricted-syntax, no-empty-function --> 64 65 <!-- eslint no-undef: "error" --> 66 67 ```javascript 68 var isArrowFunction = require( '@stdlib/assert/is-arrow-function' ); 69 70 var bool = isArrowFunction( () => {} ); 71 // returns true 72 73 bool = isArrowFunction( function foo() {} ); 74 // returns false 75 76 bool = isArrowFunction( 'beep' ); 77 // returns false 78 79 bool = isArrowFunction( 5 ); 80 // returns false 81 82 bool = isArrowFunction( true ); 83 // returns false 84 85 bool = isArrowFunction( null ); 86 // returns false 87 88 bool = isArrowFunction( [] ); 89 // returns false 90 91 bool = isArrowFunction( {} ); 92 // returns false 93 ``` 94 95 </section> 96 97 <!-- /.examples --> 98 99 <section class="links"> 100 101 [mdn-arrow-function]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions 102 103 </section> 104 105 <!-- /.links -->