106 lines
2.1 KiB
Markdown
106 lines
2.1 KiB
Markdown
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@license Apache-2.0
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Copyright (c) 2021 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# isArrowFunction
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> Test if a value is an [`arrow function`][mdn-arrow-function].
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<section class="usage">
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## Usage
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```javascript
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var isArrowFunction = require( '@stdlib/assert/is-arrow-function' );
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```
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#### isArrowFunction( value )
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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; }`.
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<!-- eslint-disable func-style, no-restricted-syntax -->
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```javascript
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var beep = () => {
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console.log( 'beep' );
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};
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var bool = isArrowFunction( beep );
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// returns true
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function boop() {
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console.log( 'boop' );
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}
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bool = isArrowFunction( boop );
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// returns false
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```
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</section>
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<!-- /.usage -->
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<section class="examples">
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## Examples
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<!-- eslint-disable func-style, no-restricted-syntax, no-empty-function -->
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<!-- eslint no-undef: "error" -->
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```javascript
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var isArrowFunction = require( '@stdlib/assert/is-arrow-function' );
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var bool = isArrowFunction( () => {} );
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// returns true
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bool = isArrowFunction( function foo() {} );
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// returns false
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bool = isArrowFunction( 'beep' );
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// returns false
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bool = isArrowFunction( 5 );
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// returns false
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bool = isArrowFunction( true );
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// returns false
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bool = isArrowFunction( null );
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// returns false
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bool = isArrowFunction( [] );
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// returns false
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bool = isArrowFunction( {} );
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// returns false
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```
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</section>
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<!-- /.examples -->
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<section class="links">
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[mdn-arrow-function]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions
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</section>
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<!-- /.links -->
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