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zip2views

Zip one or more arrays to an array of composite views.

Installation

npm install @stdlib/array-base-zip2views

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 zip2views = require( '@stdlib/array-base-zip2views' );

zip2views( arrays, labels )

Zips one or more arrays to an array of composite views.

var x = [ 1, 2, 3 ];
var y = [ 'a', 'b', 'c' ];

var labels = [ 'x', 'y' ];

var z = zip2views( [ x, y ], labels );
// returns [ <Object>, <Object>, <Object> ]

var v0 = z[ 0 ].toJSON();
// returns { 'x': 1, 'y': 'a' }

var v1 = z[ 1 ].toJSON();
// returns { 'x': 2, 'y': 'b' }

var v2 = z[ 2 ].toJSON();
// returns { 'x': 3, 'y': 'c' }

// Mutate one of the input arrays:
x[ 0 ] = 5;

v0 = z[ 0 ].toJSON();
// returns { 'x': 5, 'y': 'a' }

// Set a view property:
z[ 1 ].y = 'beep';

v1 = z[ 1 ].toJSON();
// returns { 'x': 2, 'y': 'beep' }

var y1 = y.slice();
// returns [ 'a', 'beep', 'c' ]

The function supports the following parameters:

• arrays: list of arrays to zip.
• labels: list of array labels.

Each element in the returned array is a class instance having prototype properties corresponding to the list of array labels. As demonstrated in the example above, to convert an element to a regular object, invoke an element's toJSON method. Note, however, that the object returned by an element's toJSON method no longer shares the same memory as the provided input arrays.

• The function assumes that the list of arrays to be zipped all have the same length.
• The number of provided array labels should equal the number of arrays to be zipped.
• Each view in the returned array shares the same memory as the corresponding elements in the input arrays. Accordingly, mutation of either an input array or a view will mutate the other.

Examples

var discreteUniform = require( '@stdlib/random-array-discrete-uniform' );
var zeroTo = require( '@stdlib/array-base-zero-to' );
var zip2views = require( '@stdlib/array-base-zip2views' );

var x = zeroTo( 10 );
var y = discreteUniform( x.length, -100, 100 );

var labels = [ 'x', 'y' ];

var out = zip2views( [ x, y ], labels );
// returns [...]

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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

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License

See LICENSE.

Copyright

Copyright © 2016-2025. The Stdlib Authors.