npm package: @stdlib/assert-is-whitespace
Description: Test whether a string contains only white space characters.
Author: The Stdlib Authors
Latest version: 0.2.3

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# isWhitespace

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

> Test whether a string contains only [white space][whitespace] characters.

<section class="installation">

## Installation

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

</section>

<section class="usage">

## Usage

```javascript
var isWhitespace = require( '@stdlib/assert-is-whitespace' );
```

#### isWhitespace( value )

Tests whether a string contains only [white space][whitespace] characters.

```javascript
var bool = isWhitespace( '             ' );
// returns true
```

</section>

<!-- /.usage -->

<section class="notes">

## Notes

-   A [white space][whitespace] character is defined as one of the 25 characters defined as a [white space][whitespace] ("WSpace=Y","WS") character in the Unicode 9.0 character database, as well as one related [white space][whitespace] character without the Unicode character property "WSpace=Y" (zero width non-breaking space which was deprecated as of Unicode 3.2).
-   For non-string values, the function returns `false`.

</section>

<!-- /.notes -->

<section class="examples">

## Examples

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

```javascript
var isWhitespace = require( '@stdlib/assert-is-whitespace' );

var out = isWhitespace( '              ' );
// returns true

out = isWhitespace( '' );
// returns false

out = isWhitespace( '\\r\\n' );
// returns false

out = isWhitespace( 123 );
// returns false
```

</section>

<!-- /.examples -->



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

<section class="related">

## See Also

-   <span class="package-name">[`@stdlib/assert-is-whitespace-cli`][@stdlib/assert-is-whitespace-cli]</span><span class="delimiter">: </span><span class="description">CLI package for use as a command-line utility.</span>
-   <span class="package-name">[`@stdlib/regexp-whitespace`][@stdlib/regexp/whitespace]</span><span class="delimiter">: </span><span class="description">return a regular expression to match a white space character.</span>

</section>

<!-- /.related -->

<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->


<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 -->

<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="links">

[@stdlib/assert-is-whitespace-cli]: https://www.npmjs.com/package/@stdlib/assert-is-whitespace-cli

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

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

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

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[chat-image]: https://img.shields.io/badge/zulip-join_chat-brightgreen.svg
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[stdlib]: https://github.com/stdlib-js/stdlib

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

[cli-section]: https://github.com/stdlib-js/assert-is-whitespace#cli
[cli-url]: https://github.com/stdlib-js/assert-is-whitespace/tree/cli
[@stdlib/assert-is-whitespace]: https://github.com/stdlib-js/assert-is-whitespace/tree/main

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

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

[whitespace]: https://en.wikipedia.org/wiki/Whitespace_character

[standard-streams]: https://en.wikipedia.org/wiki/Standard_streams

[mdn-regexp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions

<!-- <related-links> -->

[@stdlib/regexp/whitespace]: https://www.npmjs.com/package/@stdlib/regexp-whitespace

<!-- </related-links> -->

</section>

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