@stdlib/utils-unshift

Add one or more elements to the beginning of a collection.

https://github.com/stdlib-js/utils-unshift

Science Score: 44.0%

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Low similarity (15.6%) to scientific vocabulary

Keywords

append array extend float32array float64array int32array javascript lengthen node node-js nodejs stdlib typed-array uint32array unshift util utilities utility utils

Keywords from Contributors

iterate names tokenizer accumulate assert normalize reduce capitals inherited value

Last synced: 4 months ago · JSON representation ·

Repository

Add one or more elements to the beginning of a collection.

Basic Info

Host: GitHub
Owner: stdlib-js
License: apache-2.0
Language: JavaScript
Default Branch: main
Homepage: https://github.com/stdlib-js/stdlib
Size: 1.43 MB

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Stars: 2
Watchers: 3
Forks: 0
Open Issues: 0
Releases: 0

Topics

append array extend float32array float64array int32array javascript lengthen node node-js nodejs stdlib typed-array uint32array unshift util utilities utility utils

Created over 4 years ago · Last pushed 5 months ago

Metadata Files

Readme Changelog Contributing License Code of conduct Citation Security

We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

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!

unshift

Add one or more elements to the beginning of a collection.

## Installation ```bash npm install @stdlib/utils-unshift ``` 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 unshift = require( '@stdlib/utils-unshift' ); ``` #### unshift( collection, ...items ) Adds one or more elements to the beginning of a `collection`. A `collection` may be either an [`Array`][mdn-array], [`Typed Array`][mdn-typed-array], or an array-like [`Object`][mdn-object] (i.e., an [`Object`][mdn-object] having a valid writable `length` property). ```javascript var arr = [ 1.0, 2.0, 3.0, 4.0, 5.0 ]; var out = unshift( arr, 6.0, 7.0 ); // returns [ 6.0, 7.0, 1.0, 2.0, 3.0, 4.0, 5.0 ] var bool = ( out === arr ); // returns true ``` In contrast to [`Array.prototype.unshift`][mdn-array-unshift], the function returns the extended collection, rather than the collection length. For [typed arrays][mdn-typed-array], the returned value is a new [typed array][mdn-typed-array] view whose underlying [`ArrayBuffer`][mdn-arraybuffer] may **not** equal the underlying [`ArrayBuffer`][mdn-arraybuffer] for the input `collection`. ```javascript var ArrayBuffer = require( '@stdlib/array-buffer' ); var Float64Array = require( '@stdlib/array-float64' ); var buf = new ArrayBuffer( 3*8 ); // 8 bytes per double var arr = new Float64Array( buf, 8, 2 ); arr[ 0 ] = 1.0; arr[ 1 ] = 2.0; var out = unshift( arr, 3.0 ); // returns [ 3.0, 1.0, 2.0 ] var bool = ( out === arr ); // returns false bool = ( out.buffer === arr.buffer ); // returns true out = unshift( out, 4.0 ); // returns [ 4.0, 3.0, 1.0, 2.0 ] bool = ( out.buffer === arr.buffer ); // returns false ```

## Notes - The function adds one or more elements to a [typed array][mdn-typed-array] by setting values in the underlying [`ArrayBuffer`][mdn-arraybuffer]. If an [`ArrayBuffer`][mdn-arraybuffer] does not have enough bytes in which to store all elements, the function allocates a new [`ArrayBuffer`][mdn-arraybuffer] capable of holding `2^n` elements, where `n` is the next power of `2`. This procedure is similar to how environments internally handle dynamic memory allocation for [`Arrays`][mdn-array]. - Beware when providing [typed arrays][mdn-typed-array] which are views pointing to a shared (or pooled) [`ArrayBuffer`][mdn-arraybuffer]. Because the function sets [`ArrayBuffer`][mdn-arraybuffer] bytes outside of a provided [view][mdn-typed-array], the function may overwrite bytes belonging to one or more external views. This could be a potential **security vulnerability**. Prefer providing [typed arrays][mdn-typed-array] which have an exclusive [`ArrayBuffer`][mdn-arraybuffer]; otherwise, be sure to plan for and guard against mutated state.

## Examples ```javascript var Float64Array = require( '@stdlib/array-float64' ); var unshift = require( '@stdlib/utils-unshift' ); var arr; var i; arr = new Float64Array(); for ( i = 0; i < 100; i++ ) { arr = unshift( arr, i ); } console.log( arr ); ```

* * * ## 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 © 2016-2025. The Stdlib [Authors][stdlib-authors].

Owner

Name: stdlib
Login: stdlib-js
Kind: organization

Website: https://stdlib.io
Twitter: stdlibjs
Repositories: 3,692
Profile: https://github.com/stdlib-js

Standard library for JavaScript.

Citation (CITATION.cff)

cff-version: 1.2.0
title: stdlib
message: >-
  If you use this software, please cite it using the
  metadata from this file.

type: software

authors:
  - name: The Stdlib Authors
    url: https://github.com/stdlib-js/stdlib/graphs/contributors

repository-code: https://github.com/stdlib-js/stdlib
url: https://stdlib.io

abstract: |
  Standard library for JavaScript and Node.js.

keywords:
  - JavaScript
  - Node.js
  - TypeScript
  - standard library
  - scientific computing
  - numerical computing
  - statistical computing

license: Apache-2.0 AND BSL-1.0

date-released: 2016

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Total packages: 1
Total downloads:
- npm 11 last-month

Total dependent packages: 2
Total dependent repositories: 0
Total versions: 13
Total maintainers: 4

npmjs.org: @stdlib/utils-unshift

Add one or more elements to the beginning of a collection.

Homepage: https://stdlib.io
License: Apache-2.0
Latest release: 0.2.2
published over 1 year ago

Versions: 13
Dependent Packages: 2
Dependent Repositories: 0
Downloads: 11 Last month

Rankings

Dependent packages count: 9.5%

Downloads: 13.3%

Average: 16.5%

Stargazers count: 16.8%

Forks count: 17.4%

Dependent repos count: 25.3%

Maintainers (4)

planeshifter rreusser stdlib-bot kgryte

Funding

type: opencollective
url: https://opencollective.com/stdlib

Last synced: 5 months ago

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package.json npm

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@stdlib/utils-unshift

Science Score: 44.0%

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unshift

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