npm package: @stdlib/array-base-cunone-by
Description: Cumulatively test whether every element in a provided array fails a test implemented by a predicate function.
Author: The Stdlib Authors
Latest version: 0.1.1

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# cunoneBy

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

> Cumulatively test whether every array element in a provided array fails a test implemented by a predicate function.

<section class="installation">

## Installation

```bash
npm install @stdlib/array-base-cunone-by
```

</section>

<section class="usage">

## Usage

```javascript
var cunoneBy = require( '@stdlib/array-base-cunone-by' );
```

#### cunoneBy( x, predicate\[, thisArg ] )

Cumulatively tests whether every array element in a provided array fails a test implemented by a predicate function.

```javascript
function fcn( value) {
    return ( value > 0 );
}

var x = [ 0, 0, 0, 1, 0 ];

var y = cunoneBy( x, fcn );
// returns [ true, true, true, false, false ]
```

The invoked `predicate` function is provided three arguments:

-   **value**: collection element.
-   **index**: collection index.
-   **collection**: input collection.

To set the function execution context, provide a `thisArg`.

```javascript
function fcn( v ) {
    this.count += 1;
    return ( v > 0 );
}

var x = [ 0, 0, 1, 0, 0 ];

var context = {
    'count': 0
};

var bool = cunoneBy( x, fcn, context );
// returns [ true, true, false, false, false ]

var count = context.count;
// returns 3
```

#### cunoneBy.assign( x, out, stride, offset, predicate\[, thisArg ] )

Cumulatively tests whether every array element in a provided array fails a test implemented by a predicate function and assigns the values to elements in a provided output array.

```javascript
function fcn( v ) {
    return ( v > 0 );
}

var x = [ 0, 0, 0, 1, 0 ];
var y = [ false, null, false, null, false, null, false, null, false, null ];

var out = cunoneBy.assign( x, y, 2, 0, fcn );
// returns [ true, null, true, null, true, null, false, null, false, null ]

var bool = ( out === y );
// returns true
```

</section>

<!-- /.usage -->

<section class="notes">

</section>

<!-- /.notes -->

<section class="examples">

## Examples

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

```javascript
var bernoulli = require( '@stdlib/random-array-bernoulli' );
var cunoneBy = require( '@stdlib/array-base-cunone-by' );

function fcn( value ) {
    return ( value > 0 );
}

// Create an array of random values:
var x = bernoulli( 10, 0.1 );
console.log( x );

// Cumulatively tests whether every array element fails a test:
var y = cunoneBy( x, fcn );
console.log( y );
```

</section>

<!-- /.examples -->

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<section class="related">

</section>

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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>

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