npm package: @stdlib/utils-none
Description: Test whether all elements in a collection are falsy.
Author: The Stdlib Authors
Latest version: 0.2.3

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<details>
  <summary>
    About stdlib...
  </summary>
  <p>We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.</p>
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# none

[![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 all elements in a collection are falsy.

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<section class="intro">

</section>

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<!-- Package usage documentation. -->

<section class="installation">

## Installation

```bash
npm install @stdlib/utils-none
```

</section>

<section class="usage">

## Usage

```javascript
var none = require( '@stdlib/utils-none' );
```

#### none( collection )

Tests whether all elements in a `collection` are falsy.

```javascript
var arr = [ 0, 0, 0, 0, 0 ];

var bool = none( arr );
// returns true
```

If provided an empty `collection`, the function returns `true`.

```javascript
var bool = none( [] );
// returns true
```

</section>

<!-- /.usage -->

<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="notes">

## Notes

-   A `collection` may be either an [`Array`][mdn-array], [`Typed Array`][mdn-typed-array], or an array-like [`Object`][mdn-object] (excluding `strings` and `functions`).
-   The function does **not** skip `undefined` elements and is thus not optimized for sparse collections.

</section>

<!-- /.notes -->

<!-- Package usage examples. -->

<section class="examples">

## Examples

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

```javascript
var randu = require( '@stdlib/random-base-randu' );
var none = require( '@stdlib/utils-none' );

var bool;
var arr;
var i;

arr = new Array( 100 );
for ( i = 0; i < arr.length; i++ ) {
    arr[ i ] = ( randu() > 0.95 );
}

bool = none( arr );
// returns <boolean>
```

</section>

<!-- /.examples -->

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<section class="references">

</section>

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<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/utils-any`][@stdlib/utils/any]</span><span class="delimiter">: </span><span class="description">test whether at least one element in a collection is truthy.</span>
-   <span class="package-name">[`@stdlib/utils-every`][@stdlib/utils/every]</span><span class="delimiter">: </span><span class="description">test whether all elements in a collection are truthy.</span>
-   <span class="package-name">[`@stdlib/utils-for-each`][@stdlib/utils/for-each]</span><span class="delimiter">: </span><span class="description">invoke a function for each element in a collection.</span>
-   <span class="package-name">[`@stdlib/utils-none-by`][@stdlib/utils/none-by]</span><span class="delimiter">: </span><span class="description">test whether all elements in a collection fail a test implemented by a predicate function.</span>
-   <span class="package-name">[`@stdlib/utils-some`][@stdlib/utils/some]</span><span class="delimiter">: </span><span class="description">test whether a collection contains at least `n` elements which are truthy.</span>

</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/utils-none.svg
[npm-url]: https://npmjs.org/package/@stdlib/utils-none

[test-image]: https://github.com/stdlib-js/utils-none/actions/workflows/test.yml/badge.svg?branch=v0.2.3
[test-url]: https://github.com/stdlib-js/utils-none/actions/workflows/test.yml?query=branch:v0.2.3

[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/utils-none/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/utils-none?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/utils-none/tree/deno
[deno-readme]: https://github.com/stdlib-js/utils-none/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/utils-none/tree/umd
[umd-readme]: https://github.com/stdlib-js/utils-none/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/utils-none/tree/esm
[esm-readme]: https://github.com/stdlib-js/utils-none/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/utils-none/blob/main/branches.md

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/utils-none/main/LICENSE

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

[mdn-typed-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray

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

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

[@stdlib/utils/any]: https://www.npmjs.com/package/@stdlib/utils-any

[@stdlib/utils/every]: https://www.npmjs.com/package/@stdlib/utils-every

[@stdlib/utils/for-each]: https://www.npmjs.com/package/@stdlib/utils-for-each

[@stdlib/utils/none-by]: https://www.npmjs.com/package/@stdlib/utils-none-by

[@stdlib/utils/some]: https://www.npmjs.com/package/@stdlib/utils-some

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</section>

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