npm package: @stdlib/assert-is-class
Description: Test if a value is a class.
Author: The Stdlib Authors
Latest version: 0.2.3

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</details>

# isClass

[![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 a [class][mdn-class].

<section class="installation">

## Installation

```bash
npm install @stdlib/assert-is-class
```

</section>

<section class="usage">

## Usage

```javascript
var isClass = require( '@stdlib/assert-is-class' );
```

#### isClass( value )

Tests if a value is a [`class`][mdn-class].

<!-- eslint-disable max-classes-per-file, no-restricted-syntax, node/no-unsupported-features/es-syntax  -->

```javascript
var bool = isClass( class Animal {
    speak() {
        return this;
    }
} );
// returns true

var Rectangle = class {
    constructor( height, width ) {
        this.height = height;
        this.width = width;
    }
};

bool = isClass( Rectangle );
// returns true

bool = isClass( null );
// returns false
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

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

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

```javascript
var isClass = require( '@stdlib/assert-is-class' );

var bool = isClass( class Person {} );
// returns true

bool = isClass( function Person() {} );
// returns false

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

bool = isClass( {} );
// returns false

bool = isClass( null );
// 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-class.svg
[npm-url]: https://npmjs.org/package/@stdlib/assert-is-class

[test-image]: https://github.com/stdlib-js/assert-is-class/actions/workflows/test.yml/badge.svg?branch=v0.2.3
[test-url]: https://github.com/stdlib-js/assert-is-class/actions/workflows/test.yml?query=branch:v0.2.3

[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/assert-is-class/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/assert-is-class?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-class/tree/deno
[deno-readme]: https://github.com/stdlib-js/assert-is-class/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/assert-is-class/tree/umd
[umd-readme]: https://github.com/stdlib-js/assert-is-class/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/assert-is-class/tree/esm
[esm-readme]: https://github.com/stdlib-js/assert-is-class/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/assert-is-class/blob/main/branches.md

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

[mdn-class]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes

</section>

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