Return a function which tests if every element in an array passes a test condition.
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> Return a function which tests if every element in an array passes a test condition.
``bash`
npm install @stdlib/assert-tools-array-function
`javascript`
var arrayfcn = require( '@stdlib/assert-tools-array-function' );
#### 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
`
- The returned function will return false if not provided an [array][mdn-array].false
- The returned function will return if provided an empty [array][mdn-array].predicate
- A 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.
`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
`
*
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].
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---
See [LICENSE][stdlib-license].
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[mdn-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array