npm package: @stdlib/assert-is-arrow-function
Description: Test if a value is an arrow function.
Author: The Stdlib Authors
Latest version: 0.2.4

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# isArrowFunction

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> Test if a value is an [`arrow function`][mdn-arrow-function].

<section class="installation">

## Installation

```bash
npm install @stdlib/assert-is-arrow-function
```

</section>

<section class="usage">

## Usage

```javascript
var isArrowFunction = require( '@stdlib/assert-is-arrow-function' );
```

#### isArrowFunction( value )

Tests if a `value` is an [`arrow function`][mdn-arrow-function] such as `( a, b ) => a + b`, `x => x`, or `( x ) => { return x*x; }`.

<!-- eslint-disable func-style, no-restricted-syntax, node/no-unsupported-features/es-syntax -->

```javascript
var beep = () => {
    console.log( 'beep' );
};

var bool = isArrowFunction( beep );
// returns true

function boop() {
    console.log( 'boop' );
}

bool = isArrowFunction( boop );
// returns false
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- eslint-disable func-style, no-restricted-syntax, no-empty-function, node/no-unsupported-features/es-syntax -->

<!-- eslint no-undef: "error" -->

```javascript
var isArrowFunction = require( '@stdlib/assert-is-arrow-function' );

var bool = isArrowFunction( () => {} );
// returns true

bool = isArrowFunction( function foo() {} );
// returns false

bool = isArrowFunction( 'beep' );
// returns false

bool = isArrowFunction( 5 );
// returns false

bool = isArrowFunction( true );
// returns false

bool = isArrowFunction( null );
// returns false

bool = isArrowFunction( [] );
// returns false

bool = isArrowFunction( {} );
// returns false
```

</section>

<!-- /.examples -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

</section>

<!-- /.related -->

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<section class="main-repo" >

* * *

## Notice

This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].

#### Community

[![Chat][chat-image]][chat-url]

---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

</section>

<!-- /.stdlib -->

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<section class="links">

[npm-image]: http://img.shields.io/npm/v/@stdlib/assert-is-arrow-function.svg
[npm-url]: https://npmjs.org/package/@stdlib/assert-is-arrow-function

[test-image]: https://github.com/stdlib-js/assert-is-arrow-function/actions/workflows/test.yml/badge.svg?branch=v0.2.4
[test-url]: https://github.com/stdlib-js/assert-is-arrow-function/actions/workflows/test.yml?query=branch:v0.2.4

[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/assert-is-arrow-function/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/assert-is-arrow-function?branch=main

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[stdlib]: https://github.com/stdlib-js/stdlib

[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors

[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules

[deno-url]: https://github.com/stdlib-js/assert-is-arrow-function/tree/deno
[deno-readme]: https://github.com/stdlib-js/assert-is-arrow-function/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/assert-is-arrow-function/tree/umd
[umd-readme]: https://github.com/stdlib-js/assert-is-arrow-function/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/assert-is-arrow-function/tree/esm
[esm-readme]: https://github.com/stdlib-js/assert-is-arrow-function/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/assert-is-arrow-function/blob/main/branches.md

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/assert-is-arrow-function/main/LICENSE

[mdn-arrow-function]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions

</section>

<!-- /.links -->