https://github.com/stdlib-js/array-base-accessor-getter
Return an accessor function for retrieving an element from an array-like object supporting the get/set protocol.
https://github.com/stdlib-js/array-base-accessor-getter
access accessor array generic get getter javascript node node-js nodejs retrieve stdlib
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Return an accessor function for retrieving an element from an array-like object supporting the get/set protocol.
- Host: GitHub
- URL: https://github.com/stdlib-js/array-base-accessor-getter
- Owner: stdlib-js
- License: apache-2.0
- Created: 2022-12-06T03:26:19.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2025-01-06T01:37:42.000Z (over 1 year ago)
- Last Synced: 2025-04-12T04:39:24.176Z (about 1 year 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: 246 KB
- 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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# accessorGetter
[![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 array-like object supporting the get/set protocol.
## Installation
```bash
npm install @stdlib/array-base-accessor-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 accessorGetter = require( '@stdlib/array-base-accessor-getter' );
```
#### accessorGetter( dtype )
Returns an accessor function for retrieving an element from an array-like object supporting the get/set protocol.
```javascript
var Complex64Array = require( '@stdlib/array-complex64' );
var arr = new Complex64Array( [ 1, 2, 3, 4 ] );
var get = accessorGetter( 'complex64' );
var v = get( arr, 1 );
// returns [ 3.0, 4.0 ]
```
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 supporting the get/set protocol; otherwise, the function returns an accessor function which should **only** be provided an array instance corresponding to `dtype` (e.g., if `dtype` is `'complex64'`, the returned accessor function should only be provided instances of `Complex64Array`).
- 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** verify that provided input arrays actually implement the get/set protocol.
- An array-like object supporting the get/set protocol is a data structure in which one accesses elements using explicit `get` and `set` methods (e.g., `Complex64Array` and `Complex128Array`).
## Examples
```javascript
var Complex128Array = require( '@stdlib/array-complex128' );
var Complex64Array = require( '@stdlib/array-complex64' );
var zeroTo = require( '@stdlib/array-base-zero-to' );
var dtype = require( '@stdlib/array-dtype' );
var accessorGetter = require( '@stdlib/array-base-accessor-getter' );
var arr = new Complex128Array( zeroTo( 10 ) );
var v = accessorGetter( dtype( arr ) )( arr, 2 );
// returns [ 4.0, 5.0 ]
console.log( v.toString() );
// => '4 + 5i'
arr = new Complex64Array( zeroTo( 10 ) );
v = accessorGetter( dtype( arr ) )( arr, 4 );
// returns [ 8.0, 9.0 ]
console.log( v.toString() );
// => '8 + 9i'
```
* * *
## 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-accessor-getter.svg
[npm-url]: https://npmjs.org/package/@stdlib/array-base-accessor-getter
[test-image]: https://github.com/stdlib-js/array-base-accessor-getter/actions/workflows/test.yml/badge.svg?branch=main
[test-url]: https://github.com/stdlib-js/array-base-accessor-getter/actions/workflows/test.yml?query=branch:main
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/array-base-accessor-getter/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/array-base-accessor-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-accessor-getter/tree/deno
[deno-readme]: https://github.com/stdlib-js/array-base-accessor-getter/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/array-base-accessor-getter/tree/umd
[umd-readme]: https://github.com/stdlib-js/array-base-accessor-getter/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/array-base-accessor-getter/tree/esm
[esm-readme]: https://github.com/stdlib-js/array-base-accessor-getter/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/array-base-accessor-getter/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/array-base-accessor-getter/main/LICENSE
[@stdlib/array/dtypes]: https://github.com/stdlib-js/array-dtypes