npm package: @stdlib/assert-tools-array-function
Description: Return a function which tests if every element in an array passes a test condition.
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>

# Array 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 passes a test condition.

<section class="installation">

## Installation

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

</section>

<section class="usage">

## Usage

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

<a name="arrayfcn"></a>

#### arrayfcn( predicate )

Returns a function which tests if every element in an [`array`][mdn-array] passes a test condition. Given an input [`array`][mdn-array], 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 = arrayfcn( 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`][mdn-array].
-   The returned function will return `false` if provided an empty [`array`][mdn-array].
-   A `predicate` function should accept a single argument: an [`array`][mdn-array] element. If the [`array`][mdn-array] 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 arrayfcn = require( '@stdlib/assert-tools-array-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 = arrayfcn( 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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<section class="links">

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

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

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

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

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

</section>

<!-- /.links -->