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# Array Function

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

<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 class="links">

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

</section>

<!-- /.links -->