cusomeByRight

Cumulatively test whether at least n elements in a provided array pass a test implemented by a predicate function, while iterating from right-to-left.

Installation

npm install @stdlib/array-base-cusome-by-right

Usage

var cusomeByRight = require( '@stdlib/array-base-cusome-by-right' );

cusomeByRight( x, n, predicate[, thisArg ] )

Cumulatively tests whether at least n elements in a provided array pass a test implemented by a predicate function, while iterating from right-to-left.

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

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

var y = cusomeByRight( x, 2, fcn );
// returns [ false, false, false, false, true ];

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.

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

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

var context = {
    'count': 0
};

var bool = cusomeByRight( x, 2, fcn, context );
// returns [ false, false, false, false, true ]

var count = context.count;
// returns 5

cusomeByRight.assign( x, n, out, stride, offset, predicate[, thisArg ] )

Cumulatively tests whether at least n elements in a provided array pass a test implemented by a predicate function, while iterating from right-to-left, and assigns the results to the elements in the output array.

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

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

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

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

Examples

var bernoulli = require( '@stdlib/random-array-bernoulli' );
var cusomeByRight = require( '@stdlib/array-base-cusome-by-right' );

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

// Create an array of random values:
var x = bernoulli( 10, 0.3 );
console.log( x );

// Minimum number of required positive array elements:
var n = 2;

// Cumulatively test whether at least `n` array elements pass a test, while iterating from right-to-left:
var out = cusomeByRight( x, n, fcn );
console.log( out );

Notice

This package is part of 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, see the main project repository.

Community

License

See LICENSE.

Copyright

Copyright © 2016-2026. The Stdlib Authors.