npm package: @stdlib/array-base-scattered
Description: Scatter a list of provided values to specified indices in a new zero-filled "generic" array.
Author: The Stdlib Authors
Latest version: 0.1.1

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<details>
  <summary>
    About stdlib...
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  <p>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.</p>
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# scattered

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

> Scatter a list of provided values to specified indices in a new zero-filled "generic" array.

<section class="installation">

## Installation

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

</section>

<section class="usage">

## Usage

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

#### scattered( len, indices, values, mode )

Scatters a list of provided values to specified indices in a new zero-filled "generic" array.

```javascript
var out = scattered( 4, [ 1, 3 ], [ 20, 40 ], 'throw' );
// returns [ 0, 20, 0, 40 ]
```

The function supports the following parameters:

-   **len**: output array length.
-   **indices**: list of indices.
-   **values**: values to scatter. When `indices` contains one or more elements, `values` must be broadcast [compatible][@stdlib/ndarray/base/broadcast-shapes] with `indices` (i.e., must have either one element or the same number of elements as `indices`).
-   **mode**: index [mode][@stdlib/ndarray/base/ind].

If `indices` is an empty array, the function returns a zero-filled array.

```javascript
var out = scattered( 4, [], [ 20, 40 ], 'throw' );
// returns [ 0, 0, 0, 0 ]
```

The function supports broadcasting a `values` array containing a single element against an `indices` array containing one or more elements.

```javascript
var out = scattered( 4, [ 1, 3 ], [ 20 ], 'throw' );
// returns [ 0, 20, 0, 20 ]
```

</section>

<!-- /.usage -->

<section class="notes">

</section>

<!-- /.notes -->

<section class="examples">

## Examples

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

```javascript
var filledBy = require( '@stdlib/array-base-filled-by' );
var discreteUniform = require( '@stdlib/random-base-discrete-uniform' );
var scattered = require( '@stdlib/array-base-scattered' );

// Generate an array of random indices:
var N = discreteUniform( 5, 15 );
var indices = filledBy( N, discreteUniform.factory( 0, 10 ) );
console.log( indices );

// Generate an array of random values:
var values = filledBy( N, discreteUniform.factory( 1000, 2025 ) );
console.log( values );

// Scatter a random sample of elements to a new array:
var out = scattered( 11, indices, values, 'throw' );
console.log( out );
```

</section>

<!-- /.examples -->

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<section class="related">

</section>

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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>

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[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/array-base-scattered/main.svg
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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-scattered/tree/deno
[deno-readme]: https://github.com/stdlib-js/array-base-scattered/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/array-base-scattered/tree/umd
[umd-readme]: https://github.com/stdlib-js/array-base-scattered/blob/umd/README.md
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[esm-readme]: https://github.com/stdlib-js/array-base-scattered/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/array-base-scattered/blob/main/branches.md

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

[@stdlib/ndarray/base/ind]: https://www.npmjs.com/package/@stdlib/ndarray-base-ind

[@stdlib/ndarray/base/broadcast-shapes]: https://www.npmjs.com/package/@stdlib/ndarray-base-broadcast-shapes

</section>

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