@stdlib/array-base-any-by-right

About stdlib...

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.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

anyByRight

Test whether at least one element in an array passes a test implemented by a predicate function, while iterating from right to left.

Installation

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

Usage

var anyByRight = require( '@stdlib/array-base-any-by-right' );

anyByRight( x, predicate[, thisArg] )

Tests whether at least one element in an array passes a test implemented by a predicate function, while iterating from right to left.

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

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

var bool = anyByRight( x, isPositive );
// returns true

If a predicate function returns a truthy value, the function immediately returns false.

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

var x = [ -1, -2, -3, -4 ];

var bool = anyByRight( x, isPositive );
// returns false

The predicate function is provided three arguments:

• value: current array element.
• index: current array element index.
• arr: input array.

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

function predicate( value ) {
    this.count += 1;
    return ( value > 0 );
}

var x = [ -1, -2, 3, -4 ];

var context = {
    'count': 0
};

var bool = anyByRight( x, predicate, context );
// returns true

var cnt = context.count;
// returns 2

Notes

• The function performs a linear scan and returns immediately upon encountering a truthy return value. Unlike Array.prototype.some, when performing a linear scan, the function does not skip undefined elements.
• If provided an empty array, the function returns false.

Examples

var bernoulli = require( '@stdlib/random-array-bernoulli' );
var isPositiveInteger = require( '@stdlib/assert-is-positive-integer' ).isPrimitive;
var naryFunction = require( '@stdlib/utils-nary-function' );
var anyByRight = require( '@stdlib/array-base-any-by-right' );

var x = bernoulli( 10, 0.1, {
    'dtype': 'int8'
});
// returns <Int8Array>

var out = anyByRight( x, naryFunction( isPositiveInteger, 1 ) );
// returns <boolean>

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 © 2016-2024. The Stdlib Authors.

Changelog

0.2.2 (2024-07-29)

No changes reported for this release.

</section> <!-- /.release --> <section class="release" id="v0.2.1">