https://github.com/stdlib-js/array-base-with
Return a new array after replacing an index with a given value.
https://github.com/stdlib-js/array-base-with
access accessor array base collection get getter javascript node node-js nodejs retrieve stdlib typed vector with
Last synced: 6 months ago
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Return a new array after replacing an index with a given value.
- Host: GitHub
- URL: https://github.com/stdlib-js/array-base-with
- Owner: stdlib-js
- License: apache-2.0
- Created: 2024-02-26T15:26:10.000Z (almost 2 years ago)
- Default Branch: main
- Last Pushed: 2025-06-30T01:37:29.000Z (7 months ago)
- Last Synced: 2025-06-30T02:22:35.282Z (7 months ago)
- Topics: access, accessor, array, base, collection, get, getter, javascript, node, node-js, nodejs, retrieve, stdlib, typed, vector, with
- Language: JavaScript
- Homepage: https://github.com/stdlib-js/stdlib
- Size: 1.1 MB
- Stars: 1
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
- Citation: CITATION.cff
- Security: SECURITY.md
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README
About stdlib...
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# arrayWith
[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]
> Return a new array with the element at the specified index replaced with a provided value.
## Installation
```bash
npm install @stdlib/array-base-with
```
Alternatively,
- To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]).
- If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions).
- For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]).
The [branches.md][branches-url] 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
```javascript
var arrayWith = require( '@stdlib/array-base-with' );
```
#### arrayWith( x, index, value )
Returns a new array with the element at the specified index replaced with a provided value.
```javascript
var x = [ 1, 2, 3, 4 ];
var out = arrayWith( x, 0, 5 );
// returns [ 5, 2, 3, 4 ]
out = arrayWith( x, -1, 6 );
// returns [ 1, 2, 3, 6 ]
```
The function accepts the following arguments:
- **x**: an input array.
- **index**: element index.
- **value**: replacement value.
### arrayWith.assign( x, index, value, out, stride, offset )
Copies elements from one array to another array and sets the element at the specified index to a provided value.
```javascript
var x = [ 1, 2, 3, 4 ];
var out = [ 0, 0, 0, 0 ];
var arr = arrayWith.assign( x, 0, 5, out, 1, 0 );
// returns [ 5, 2, 3, 4 ]
var bool = ( arr === out );
// returns true
```
The function accepts the following arguments:
- **x**: an input array.
- **index**: element index.
- **value**: replacement value.
- **out**: output array.
- **stride**: output array stride.
- **offset**: output array offset.
## Notes
- If provided an array-like object having a `with` method, the `arrayWith` function defers execution to that method and assumes that the method has the following signature:
```text
x.with( index, value )
```
If provided an array-like object without a `with` method, the `arrayWith` function shallow copies input array data to a new generic array, normalizes a provided index, and sets a specified element.
- Negative indices are resolved relative to the last array element, with the last element corresponding to `-1`.
## Examples
```javascript
var discreteUniform = require( '@stdlib/random-array-discrete-uniform' );
var arrayWith = require( '@stdlib/array-base-with' );
// Define an array:
var opts = {
'dtype': 'generic'
};
var x = discreteUniform( 5, -100, 100, opts );
// Define an array containing random index values:
var indices = discreteUniform( 100, -x.length, x.length-1, opts );
// Define an array with random values to set:
var values = discreteUniform( indices.length, -10000, 10000, opts );
// Randomly set elements in the input array:
var i;
for ( i = 0; i < indices.length; i++ ) {
console.log( 'x = [%s]', arrayWith( x, indices[ i ], values[ i ] ).join( ',' ) );
}
```
* * *
## 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 © 2016-2025. The Stdlib [Authors][stdlib-authors].
[npm-image]: http://img.shields.io/npm/v/@stdlib/array-base-with.svg
[npm-url]: https://npmjs.org/package/@stdlib/array-base-with
[test-image]: https://github.com/stdlib-js/array-base-with/actions/workflows/test.yml/badge.svg?branch=main
[test-url]: https://github.com/stdlib-js/array-base-with/actions/workflows/test.yml?query=branch:main
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/array-base-with/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/array-base-with?branch=main
[chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg
[chat-url]: https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im
[stdlib]: https://github.com/stdlib-js/stdlib
[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors
[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-with/tree/deno
[deno-readme]: https://github.com/stdlib-js/array-base-with/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/array-base-with/tree/umd
[umd-readme]: https://github.com/stdlib-js/array-base-with/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/array-base-with/tree/esm
[esm-readme]: https://github.com/stdlib-js/array-base-with/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/array-base-with/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/array-base-with/main/LICENSE