@stdlib/utils-async-parallel

Execute a set of functions in parallel.

https://github.com/stdlib-js/utils-async-parallel

Science Score: 44.0%

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Low similarity (16.4%) to scientific vocabulary

Keywords

async concurrent control fcns flow functions javascript node node-js nodejs parallel parallelism run stdlib util utilities utils

Last synced: 4 months ago · JSON representation ·

Repository

Execute a set of functions in parallel.

Basic Info

Host: GitHub
Owner: stdlib-js
License: apache-2.0
Language: JavaScript
Default Branch: main
Homepage: https://github.com/stdlib-js/stdlib
Size: 242 KB

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Stars: 2
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async concurrent control fcns flow functions javascript node node-js nodejs parallel parallelism run stdlib util utilities utils

Created over 1 year ago · Last pushed 7 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!

parallel

Execute functions in parallel and pass the results of all functions to a provided callback.

## Installation ```bash npm install @stdlib/utils-async-parallel ``` 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 parallel = require( '@stdlib/utils-async-parallel' ); ``` #### parallel( fcns, \[options,] done ) Executes a set of functions in parallel and passes the results of all functions to a provided callback. ```javascript function a( clbk ) { setTimeout( onTimeout, 0 ); function onTimeout() { clbk( null, 2 ); } } function b( clbk ) { setTimeout( onTimeout, 0 ); function onTimeout() { clbk( null, 4 ); } } function done( error, out ) { if ( error ) { throw error; } console.log( out ); // => [ 2, 4 ] } var fcns = [ a, b ]; parallel( fcns, done ); ``` The function accepts the following `options`: - **limit**: maximum number of functions to execute concurrently. Default: `infinity`. - **thisArg**: execution context for each function. To limit the maximum number of functions executing in parallel, set the `limit` option. ```javascript function a( clbk ) { setTimeout( onTimeout, 0 ); function onTimeout() { clbk( null, 2 ); } } function b( clbk ) { setTimeout( onTimeout, 0 ); function onTimeout() { clbk( null, 4 ); } } function done( error, out ) { if ( error ) { throw error; } console.log( out ); // => [ 2, 4 ] } var fcns = [ a, b ]; var opts = { 'limit': 1 }; parallel( fcns, opts, done ); ``` To set the `this` context for **all** `functions` in the provided function array, set the `thisArg` option. ```javascript function a( clbk ) { this.idx += 1; clbk( null, 2 ); } function b( clbk ) { this.idx += 1; clbk( null, 4 ); } var fcns = [ a, b ]; var ctx = { 'idx': 0 }; var opts = { 'thisArg': ctx }; parallel( fcns, opts, done ); function done( error, out ) { if ( error ) { throw error; } console.log( ctx.idx ); // => 2 } ``` #### parallel.factory( fcns, \[options] ) Returns a reusable function which executes a set of functions in parallel. ```javascript function a( clbk ) { setTimeout( onTimeout, 0 ); function onTimeout() { clbk( null, 2 ); } } function b( clbk ) { setTimeout( onTimeout, 0 ); function onTimeout() { clbk( null, 4 ); } } function done( error, out ) { if ( error ) { throw error; } console.log( out ); // => [ 2, 4 ] } var fcns = [ a, b ]; var run = parallel.factory( fcns ); run( done ); run( done ); run( done ); ```

## Notes - The order of the results provided to the `done` callback corresponds to the order of the provided functions. - When executed, each provided function is invoked with a single callback argument. The callback should be invoked upon function completion. The first argument is reserved as an `error` argument (which can be `null`). The second argument is reserved for any results which should be passed to the `done` callback upon completion of all provided functions. - If any function fails to invoke the callback argument, the `done` callback will never be invoked. - This implementation is intended to start asynchronous tasks so that execution of each task runs concurrently. If provided a function which does not perform asynchronous tasks, the function will execute synchronously. Hence, this implementation does **not** guarantee that execution is asynchronous. To do so, wrap the `done` callback in a `function` which either executes at the end of the current stack (e.g., `nextTick`) or during a subsequent turn of the event loop (e.g., `setImmediate`, `setTimeout`). - The function executes provided functions in the same thread. Accordingly, the function does **not** spawn new threads.

## Examples ```javascript var parallel = require( '@stdlib/utils-async-parallel' ); function foo( clbk ) { setTimeout( onTimeout, 300 ); function onTimeout() { clbk( null, 'one' ); } } function bar( clbk ) { setTimeout( onTimeout, 100 ); function onTimeout() { clbk( null, 'two' ); } } function done( error, results ) { if ( error ) { throw error; } console.log( results ); // => [ 'one', 'two' ] } var fcns = [ foo, bar ]; parallel( fcns, done ); ```

* * * ## 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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npmjs.org: @stdlib/utils-async-parallel

Execute a set of functions in parallel.

Homepage: https://stdlib.io
License: Apache-2.0
Latest release: 0.1.0
published over 1 year ago

Versions: 1
Dependent Packages: 0
Dependent Repositories: 0
Downloads: 9 Last month

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Dependent repos count: 26.2%

Average: 32.1%

Dependent packages count: 38.0%

Maintainers (4)

planeshifter rreusser stdlib-bot kgryte

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

Last synced: 4 months ago

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package.json npm

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@stdlib/utils-noop ^0.2.2 development
istanbul ^0.4.1 development
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tape git+https://github.com/kgryte/tape.git#fix/globby development
@stdlib/assert-has-own-property ^0.2.2
@stdlib/assert-is-function ^0.2.2
@stdlib/assert-is-function-array ^0.2.1
@stdlib/assert-is-plain-object ^0.2.2
@stdlib/assert-is-positive-integer ^0.2.2
@stdlib/constants-float64-pinf ^0.2.2
@stdlib/error-tools-fmtprodmsg ^0.2.2
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@stdlib/utils-define-nonenumerable-read-only-property ^0.2.2
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@stdlib/utils-async-parallel

Science Score: 44.0%

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parallel

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