npm package: @stdlib/array-base-setter
Description: Return an accessor function for setting an element in an indexed array-like object.
Author: The Stdlib Authors
Latest version: 0.2.3

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# setter

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> Return an accessor function for setting an element in an indexed array-like object.

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<section class="intro">

</section>

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<!-- Package usage documentation. -->

<section class="installation">

## Installation

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

</section>

<section class="usage">

## Usage

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

#### setter( dtype )

Returns an accessor function for setting an element in an indexed array-like object.

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

var set = setter( 'generic' );
set( arr, 2, 10 );

var v = arr[ 2 ];
// returns 10
```

The returned accessor function accepts the following arguments:

-   **arr**: input array.
-   **idx**: element index.
-   **value**: value to set.

</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 unsupported [`dtype`][@stdlib/array/dtypes], the function returns a default accessor function for accessing elements in any indexed array-like object; otherwise, the function returns an accessor function which should **only** be provided an array instance corresponding to `dtype` (e.g., if `dtype` is `'float64'`, the returned accessor function should only be provided instances of `Float64Array`).
-   Accessor functions do **not** verify that provided input arrays are array instances corresponding to `dtype`, as doing so would introduce performance overhead. If array instances corresponding to other data types are provided to an accessor function, JavaScript runtimes will consider the function polymorphic, potentially triggering de-optimization. In order to ensure maximum performance, **always** ensure that an accessor function is monomorphic.
-   Accessor functions do **not** perform bounds checking.
-   Accessor functions do **not** validate input values.
-   An _indexed_ array-like object is a data structure in which one accesses elements via integer indices using bracket `[]` notation (e.g., `Float64Array`, `Int32Array`, `Array`, etc). This is in contrast to an _accessor_ array-like object in which one accesses elements using `get` and `set` methods (e.g., `Complex64Array` and `Complex128Array`).

</section>

<!-- /.notes -->

<!-- Package usage examples. -->

<section class="examples">

## Examples

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

```javascript
var filled = require( '@stdlib/array-filled' );
var dtype = require( '@stdlib/array-dtype' );
var setter = require( '@stdlib/array-base-setter' );

var arr = filled( 1.0, 10, 'float64' );
setter( dtype( arr ) )( arr, 2, 100.0 );
console.log( arr );

arr = filled( 2.0, 10, 'float32' );
setter( dtype( arr ) )( arr, 2, 100.0 );
console.log( arr );

arr = filled( 3, 10, 'int32' );
setter( dtype( arr ) )( arr, 2, 100 );
console.log( arr );

arr = filled( 4, 10, 'int16' );
setter( dtype( arr ) )( arr, 2, 100 );
console.log( arr );

arr = filled( 5, 10, 'int8' );
setter( dtype( arr ) )( arr, 2, 100 );
console.log( arr );

arr = filled( 6, 10, 'uint32' );
setter( dtype( arr ) )( arr, 2, 100 );
console.log( arr );

arr = filled( 7, 10, 'uint16' );
setter( dtype( arr ) )( arr, 2, 100 );
console.log( arr );

arr = filled( 8, 10, 'uint8' );
setter( dtype( arr ) )( arr, 2, 100 );
console.log( arr );

arr = filled( 9, 10, 'uint8c' );
setter( dtype( arr ) )( arr, 2, 100 );
console.log( arr );
```

</section>

<!-- /.examples -->

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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].

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

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

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