npm package: @stdlib/assert-tools-array-like-function
Description: Return a function which tests if every element in an array-like object passes a test condition.
Author: The Stdlib Authors
Latest version: 0.2.3

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# Array-Like Function

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

> Return a function which tests if every element in an array-like object passes a test condition.

<section class="installation">

## Installation

```bash
npm install @stdlib/assert-tools-array-like-function
```

</section>

<section class="usage">

## Usage

```javascript
var arraylikefcn = require( '@stdlib/assert-tools-array-like-function' );
```

<a name="arraylikefcn"></a>

#### arraylikefcn( predicate )

Returns a function which tests if every element in an [array-like object][array-like] passes a test condition. Given an input [array-like object][array-like], the function returns `true` if all elements pass the test and `false` otherwise.

```javascript
var isOdd = require( '@stdlib/assert-is-odd' );

var arr1 = [ 1, 3, 5, 7 ];
var arr2 = [ 3, 5, 8 ];

var f = arraylikefcn( isOdd );

var bool = f( arr1 );
// returns true

bool = f( arr2 );
// returns false
```

</section>

<!-- /.usage -->

<section class="notes">

## Notes

-   The returned function will return `false` if **not** provided an [array-like object][array-like].
-   The returned function will return `false` if provided an empty [array-like object][array-like].
-   A `predicate` function should accept a single argument: an element from an [array-like object][array-like]. If the element satisfies a test condition, the `predicate` function should return `true`; otherwise, the `predicate` function should return `false`.

</section>

<!-- /.notes -->

<section class="examples">

## Examples

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

```javascript
var isEven = require( '@stdlib/assert-is-even' );
var arraylikefcn = require( '@stdlib/assert-tools-array-like-function' );

var arr1;
var arr2;
var bool;
var f;
var i;

arr1 = new Array( 25 );
for ( i = 0; i < arr1.length; i++ ) {
    arr1[ i ] = i;
}

arr2 = new Array( 25 );
for ( i = 0; i < arr2.length; i++ ) {
    arr2[ i ] = 2 * i;
}

f = arraylikefcn( isEven );

bool = f( arr1 );
// returns false

bool = f( arr2 );
// returns true
```

</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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[npm-image]: http://img.shields.io/npm/v/@stdlib/assert-tools-array-like-function.svg
[npm-url]: https://npmjs.org/package/@stdlib/assert-tools-array-like-function

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

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

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[stdlib]: https://github.com/stdlib-js/stdlib

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[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-tools-array-like-function/tree/deno
[deno-readme]: https://github.com/stdlib-js/assert-tools-array-like-function/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/assert-tools-array-like-function/tree/umd
[umd-readme]: https://github.com/stdlib-js/assert-tools-array-like-function/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/assert-tools-array-like-function/tree/esm
[esm-readme]: https://github.com/stdlib-js/assert-tools-array-like-function/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/assert-tools-array-like-function/blob/main/branches.md

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/assert-tools-array-like-function/main/LICENSE

[array-like]: http://www.2ality.com/2013/05/quirk-array-like-objects.html

</section>

<!-- /.links -->