https://github.com/stdlib-js/array-base-getter
Return an accessor function for retrieving an element from an indexed array-like object.
https://github.com/stdlib-js/array-base-getter
access accessor array generic get getter javascript node node-js nodejs retrieve stdlib
Last synced: 4 months ago
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Return an accessor function for retrieving an element from an indexed array-like object.
- Host: GitHub
- URL: https://github.com/stdlib-js/array-base-getter
- Owner: stdlib-js
- License: apache-2.0
- Created: 2022-12-06T03:26:42.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2026-02-09T03:05:20.000Z (5 months ago)
- Last Synced: 2026-02-22T10:51:00.542Z (4 months ago)
- Topics: access, accessor, array, generic, get, getter, javascript, node, node-js, nodejs, retrieve, stdlib
- Language: JavaScript
- Homepage: https://github.com/stdlib-js/stdlib
- Size: 312 KB
- Stars: 1
- Watchers: 2
- 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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The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.
When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.
To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!
# getter
[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]
> Return an accessor function for retrieving an element from an indexed array-like object.
## Installation
```bash
npm install @stdlib/array-base-getter
```
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 getter = require( '@stdlib/array-base-getter' );
```
#### getter( dtype )
Returns an accessor function for retrieving an element from an indexed array-like object.
```javascript
var arr = [ 1, 2, 3, 4 ];
var get = getter( 'generic' );
var v = get( arr, 2 );
// returns 3
```
The returned accessor function accepts the following arguments:
- **arr**: input array.
- **idx**: element index.
## Notes
- If provided an unsupported [`dtype`][@stdlib/array/dtypes], the function returns a default accessor function for accessing elements from 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.
- An _indexed_ array-like object is a data structure in which one retrieves 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 retrieves elements using `get` and `set` methods (e.g., `Complex64Array` and `Complex128Array`).
## Examples
```javascript
var filled = require( '@stdlib/array-filled' );
var dtype = require( '@stdlib/array-dtype' );
var getter = require( '@stdlib/array-base-getter' );
var arr = filled( 1.0, 10, 'float64' );
var v = getter( dtype( arr ) )( arr, 2 );
// returns 1.0
arr = filled( 2.0, 10, 'float32' );
v = getter( dtype( arr ) )( arr, 2 );
// returns 2.0
arr = filled( 3, 10, 'int32' );
v = getter( dtype( arr ) )( arr, 2 );
// returns 3
arr = filled( 4, 10, 'int16' );
v = getter( dtype( arr ) )( arr, 2 );
// returns 4
arr = filled( 5, 10, 'int8' );
v = getter( dtype( arr ) )( arr, 2 );
// returns 5
arr = filled( 6, 10, 'uint32' );
v = getter( dtype( arr ) )( arr, 2 );
// returns 6
arr = filled( 7, 10, 'uint16' );
v = getter( dtype( arr ) )( arr, 2 );
// returns 7
arr = filled( 8, 10, 'uint8' );
v = getter( dtype( arr ) )( arr, 2 );
// returns 8
arr = filled( 9, 10, 'uint8c' );
v = getter( dtype( arr ) )( arr, 2 );
// returns 9
```
* * *
## 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 © 2016-2026. The Stdlib [Authors][stdlib-authors].
[npm-image]: http://img.shields.io/npm/v/@stdlib/array-base-getter.svg
[npm-url]: https://npmjs.org/package/@stdlib/array-base-getter
[test-image]: https://github.com/stdlib-js/array-base-getter/actions/workflows/test.yml/badge.svg?branch=main
[test-url]: https://github.com/stdlib-js/array-base-getter/actions/workflows/test.yml?query=branch:main
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/array-base-getter/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/array-base-getter?branch=main
[chat-image]: https://img.shields.io/badge/zulip-join_chat-brightgreen.svg
[chat-url]: https://stdlib.zulipchat.com
[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-getter/tree/deno
[deno-readme]: https://github.com/stdlib-js/array-base-getter/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/array-base-getter/tree/umd
[umd-readme]: https://github.com/stdlib-js/array-base-getter/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/array-base-getter/tree/esm
[esm-readme]: https://github.com/stdlib-js/array-base-getter/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/array-base-getter/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/array-base-getter/main/LICENSE
[@stdlib/array/dtypes]: https://github.com/stdlib-js/array-dtypes