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cueveryBy

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

Installation

npm install @stdlib/array-base-cuevery-by

Alternatively,

To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
If you are using Deno, visit the deno branch (see README for usage intructions).
For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).

The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

Usage

var cueveryBy = require( '@stdlib/array-base-cuevery-by' );

cueveryBy( x, predicate[, thisArg ] )

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

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

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

var y = cueveryBy( x, fcn );
// returns [ true, true, false, 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.

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

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

var context = {
    'count': 0
};

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

var count = context.count;
// returns 3

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

Cumulatively tests whether every array element in a provided array passes a test implemented by a predicate function and assigns the results to a provided 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 = cueveryBy.assign( x, y, 2, 0, fcn );
// returns [ true, null, true, null, false, null, false, null, false, null ]

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

Examples

var bernoulli = require( '@stdlib/random-array-bernoulli' );
var cueveryBy = require( '@stdlib/array-base-cuevery-by' );

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

// Create an array of random values:
var x = bernoulli( 10, 0.8 );
console.log( x );

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

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.

stdlib-js/array-base-cuevery-by