npm package: @stdlib/array-base-nested2views
Description: Convert nested arrays to composite views.
Author: The Stdlib Authors
Latest version: 0.1.1

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# nested2views

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

> Convert nested arrays to composite views.

<section class="installation">

## Installation

```bash
npm install @stdlib/array-base-nested2views
```

</section>

<section class="usage">

## Usage

```javascript
var nested2views = require( '@stdlib/array-base-nested2views' );
```

#### nested2views( arr, fields )

Converts each nested array to a composite view.

```javascript
var x = [ [ 1, 2 ], [ 3, 4 ] ];
var fields = [ 'x', 'y' ];

var out = nested2views( x, fields );
// returns [ <Object>, <Object> ]

var v0 = out[ 0 ].toJSON();
// returns { 'x': 1, 'y': 2 }

var v1 = out[ 1 ].toJSON();
// returns { 'x': 3, 'y': 4 }

// Mutate the first nested array:
x[ 0 ][ 0 ] = 5;

v0 = out[ 0 ].toJSON();
// returns { 'x': 5, 'y': 2 }

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

v1 = out[ 1 ].toJSON();
// returns { 'x': 3, 'y': 'beep' }

var y = x.slice();
// returns [ [ 5, 2 ], [ 3, 'beep' ] ]
```

The function supports the following parameters:

-   **arr**: input array.
-   **fields**: list of field names.

Each element in the returned array is a class instance having prototype properties corresponding to the list of field names. 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 array.

</section>

<!-- /.usage -->

<section class="notes">

-   The function assumes that all nested arrays have the same length.
-   The number of provided array labels should equal the length of each nested array.
-   Each view in the returned array shares the same memory as the corresponding element in the input array. Accordingly, mutation of either a nested array or a view will mutate the other.

</section>

<!-- /.notes -->

<section class="examples">

## Examples

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

```javascript
var discreteUniform = require( '@stdlib/random-base-discrete-uniform' ).factory;
var filled2dBy = require( '@stdlib/array-base-filled2d-by' );
var nested2views = require( '@stdlib/array-base-nested2views' );

var x = filled2dBy( [ 10, 2 ], discreteUniform( -100, 100 ) );
var fields = [ 'x', 'y' ];

var out = nested2views( x, fields );
// returns [...]
```

</section>

<!-- /.examples -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

</section>

<!-- /.related -->

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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>

<!-- /.stdlib -->

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[npm-url]: https://npmjs.org/package/@stdlib/array-base-nested2views

[test-image]: https://github.com/stdlib-js/array-base-nested2views/actions/workflows/test.yml/badge.svg?branch=v0.1.1
[test-url]: https://github.com/stdlib-js/array-base-nested2views/actions/workflows/test.yml?query=branch:v0.1.1

[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/array-base-nested2views/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/array-base-nested2views?branch=main

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[stdlib]: https://github.com/stdlib-js/stdlib

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[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules

[deno-url]: https://github.com/stdlib-js/array-base-nested2views/tree/deno
[deno-readme]: https://github.com/stdlib-js/array-base-nested2views/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/array-base-nested2views/tree/umd
[umd-readme]: https://github.com/stdlib-js/array-base-nested2views/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/array-base-nested2views/tree/esm
[esm-readme]: https://github.com/stdlib-js/array-base-nested2views/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/array-base-nested2views/blob/main/branches.md

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/array-base-nested2views/main/LICENSE

</section>

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