npm package: @stdlib/array-put
Description: Replace specified elements of an array with provided values.
Author: The Stdlib Authors
Latest version: 0.0.3

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# put

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

> Replace specified elements of an array with provided values.

<section class="installation">

## Installation

```bash
npm install @stdlib/array-put
```

</section>

<section class="usage">

## Usage

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

#### put( x, indices, values\[, options] )

Replaces specified elements of an array with provided values.

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

var out = put( x, [ 1, 3 ], [ 20, 40 ] );
// returns [ 1, 20, 3, 40 ]

var bool = ( out === x );
// returns true
```

The function supports the following parameters:

-   **x**: input array.
-   **indices**: list of indices.
-   **values**: values to set. 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`).
-   **options**: function options.

The function supports the following options:

-   **mode**: index [mode][@stdlib/ndarray/base/ind]. Default: `'normalize'`.

If `indices` is an empty array, the function returns the input array unchanged.

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

var out = put( x, [], [ 20, 40 ] );
// returns [ 1, 2, 3, 4 ]
```

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

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

var out = put( x, [ 1, 3 ], [ 20 ] );
// returns [ 1, 20, 3, 20 ]
```

By default, the function normalizes negative integer indices to positive integer index equivalents.

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

var out = put( x, [ -3, -1 ], [ 20, 40 ] );
// returns [ 1, 20, 3, 40 ]
```

To specify an alternative index [mode][@stdlib/ndarray/base/ind], provide a `mode` option.

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

var out = put( x, [ -10, 10 ], [ 20, 40 ], {
    'mode': 'clamp'
});
// returns [ 20, 2, 3, 40 ]
```

</section>

<!-- /.usage -->

<section class="notes">

## Notes

-   The function mutates the input array `x`.
-   Because each index is only validated at the time of replacing a particular element, mutation may occur even when one or more indices are out-of-bounds, including when the index [mode][@stdlib/ndarray/base/ind] indicates to raise an exception.
-   The `values` array must have a [data type][@stdlib/array/dtypes] which can be [safely cast][@stdlib/array/safe-casts] to the input array data type. Floating-point data types (both real and complex) are allowed to downcast to a lower precision data type of the [same kind][@stdlib/array/same-kind-casts] (e.g., element values from a `'float64'` values array can be assigned to corresponding elements in a `'float32'` input array).

</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 linspace = require( '@stdlib/array-base-linspace' );
var put = require( '@stdlib/array-put' );

// Generate a linearly spaced array:
var x = linspace( 0, 100, 11 );
console.log( x );

// Generate an array of random indices:
var N = discreteUniform( 5, 15 );
var indices = filledBy( N, discreteUniform.factory( 0, x.length-1 ) );
console.log( indices );

// Generate an array of random values:
var values = filledBy( N, discreteUniform.factory( 1000, 2000 ) );
console.log( values );

// Update a random sample of elements in `x`:
var out = put( x, indices, values );
console.log( out );
```

</section>

<!-- /.examples -->

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

<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/array-mskput`][@stdlib/array/mskput]</span><span class="delimiter">: </span><span class="description">replace elements of an array with provided values according to a provided mask array.</span>
-   <span class="package-name">[`@stdlib/array-place`][@stdlib/array/place]</span><span class="delimiter">: </span><span class="description">replace elements of an array with provided values according to a provided mask array.</span>
-   <span class="package-name">[`@stdlib/array-take`][@stdlib/array/take]</span><span class="delimiter">: </span><span class="description">take elements from an array.</span>

</section>

<!-- /.related -->

<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->


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

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/array-put/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

[@stdlib/array/dtypes]: https://www.npmjs.com/package/@stdlib/array-dtypes

[@stdlib/array/safe-casts]: https://www.npmjs.com/package/@stdlib/array-safe-casts

[@stdlib/array/same-kind-casts]: https://www.npmjs.com/package/@stdlib/array-same-kind-casts

<!-- <related-links> -->

[@stdlib/array/mskput]: https://www.npmjs.com/package/@stdlib/array-mskput

[@stdlib/array/place]: https://www.npmjs.com/package/@stdlib/array-place

[@stdlib/array/take]: https://www.npmjs.com/package/@stdlib/array-take

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</section>

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