npm package: @stdlib/array-base-with
Description: Return a new array with the element at the specified index replaced with a provided value.
Author: The Stdlib Authors
Latest version: 0.2.1

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# arrayWith

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

> Return a new array with the element at the specified index replaced with a provided value.

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<section class="intro">

</section>

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<section class="installation">

## Installation

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

</section>

<section class="usage">

## 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.

</section>

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<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="notes">

## 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`.

</section>

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<section class="examples">

## Examples

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

```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( ',' ) );
}
```

</section>

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* * *

## 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

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---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

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