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

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<details>
  <summary>
    About stdlib...
  </summary>
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</details>

# isSymbol

[![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 [symbol][mdn-symbol].

<section class="installation">

## Installation

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

</section>

<section class="usage">

## Usage

```javascript
var isSymbol = require( '@stdlib/assert-is-symbol' );
```

#### isSymbol( value )

Tests if a value is a [symbol][mdn-symbol].

```javascript
var Object = require( '@stdlib/object-ctor' );
var Symbol = require( '@stdlib/symbol-ctor' );

var bool = isSymbol( Symbol( 'beep' ) );
// returns true

bool = isSymbol( Object( Symbol( 'beep' ) ) );
// returns true
```

#### isSymbol.isPrimitive( value )

Tests if a `value` is a primitive [symbol][mdn-symbol].

```javascript
var Object = require( '@stdlib/object-ctor' );
var Symbol = require( '@stdlib/symbol-ctor' );

var bool = isSymbol.isPrimitive( Symbol( 'beep' ) );
// returns true

bool = isSymbol.isPrimitive( Object( Symbol( 'boop' ) ) );
// returns false
```

#### isSymbol.isObject( value )

Tests if a `value` is a [`Symbol`][mdn-symbol] object.

```javascript
var Object = require( '@stdlib/object-ctor' );
var Symbol = require( '@stdlib/symbol-ctor' );

var bool = isSymbol.isObject( Symbol( 'beep' ) );
// returns false

bool = isSymbol.isObject( Object( Symbol( 'boop' ) ) );
// returns true
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- eslint-disable no-restricted-syntax, no-empty-function -->

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

```javascript
var hasSymbolSupport = require( '@stdlib/assert-has-symbol-support' );
var Symbol = require( '@stdlib/symbol-ctor' );
var isSymbol = require( '@stdlib/assert-is-symbol' );

var bool;
if ( hasSymbolSupport() ) {
    bool = isSymbol( Symbol( 'beep' ) );
    // returns true
} else {
    console.log( 'Environment does not support symbols.' );
}
bool = isSymbol( 'beep' );
// returns false

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

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

bool = isSymbol( null );
// returns false

bool = isSymbol( void 0 );
// returns false

bool = isSymbol( true );
// returns false

bool = isSymbol( function foo() {} );
// 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-symbol.svg
[npm-url]: https://npmjs.org/package/@stdlib/assert-is-symbol

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

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

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

[mdn-symbol]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol

</section>

<!-- /.links -->