npm package: @stdlib/assert-is-collection
Description: Test if a value is a collection.
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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</details>

# isCollection

[![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 collection.

<section class="intro">

A collection is defined as either an [`Array`][mdn-array], [`Typed Array`][mdn-typed-array], or an array-like [`Object`][mdn-object] (excluding `strings` and `functions`).

</section>

<!-- ./intro -->

<section class="installation">

## Installation

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

</section>

<section class="usage">

## Usage

```javascript
var isCollection = require( '@stdlib/assert-is-collection' );
```

#### isCollection( value )

Tests if a value is a collection.

```javascript
var bool = isCollection( [] );
// returns true
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- eslint-disable object-curly-newline -->

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

```javascript
var Int8Array = require( '@stdlib/array-int8' );
var Uint8Array = require( '@stdlib/array-uint8' );
var Uint8ClampedArray = require( '@stdlib/array-uint8c' );
var Int16Array = require( '@stdlib/array-int16' );
var Uint16Array = require( '@stdlib/array-uint16' );
var Int32Array = require( '@stdlib/array-int32' );
var Uint32Array = require( '@stdlib/array-uint32' );
var Float32Array = require( '@stdlib/array-float32' );
var Float64Array = require( '@stdlib/array-float64' );
var isCollection = require( '@stdlib/assert-is-collection' );

var bool = isCollection( [] );
// returns true

bool = isCollection( new Float64Array( 10 ) );
// returns true

bool = isCollection( new Float32Array( 10 ) );
// returns true

bool = isCollection( new Int32Array( 10 ) );
// returns true

bool = isCollection( new Uint32Array( 10 ) );
// returns true

bool = isCollection( new Int16Array( 10 ) );
// returns true

bool = isCollection( new Uint16Array( 10 ) );
// returns true

bool = isCollection( new Int8Array( 10 ) );
// returns true

bool = isCollection( new Uint8Array( 10 ) );
// returns true

bool = isCollection( new Uint8ClampedArray( 10 ) );
// returns true

bool = isCollection( { 'length': 0 } );
// returns true

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

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

bool = isCollection( isCollection );
// returns false

bool = isCollection( null );
// returns false

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

bool = isCollection( 3.14 );
// 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-array-like`][@stdlib/assert/is-array-like]</span><span class="delimiter">: </span><span class="description">test if a value is array-like.</span>
-   <span class="package-name">[`@stdlib/assert-is-array-like-object`][@stdlib/assert/is-array-like-object]</span><span class="delimiter">: </span><span class="description">test if a value is an array-like object.</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">

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

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

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

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/assert-is-collection/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/assert/is-array-like]: https://www.npmjs.com/package/@stdlib/assert-is-array-like

[@stdlib/assert/is-array-like-object]: https://www.npmjs.com/package/@stdlib/assert-is-array-like-object

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

</section>

<!-- /.links -->