@stdlib/utils-async-do-while

Invoke a function while a test condition is true.

https://github.com/stdlib-js/utils-async-do-while

Science Score: 44.0%

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Keywords

async asynchronous do do-while for iterate iteration javascript loop node node-js nodejs stdlib util utilities utility utils while

Last synced: 4 months ago · JSON representation ·

Repository

Invoke a function while a test condition is true.

Basic Info

Host: GitHub
Owner: stdlib-js
License: apache-2.0
Language: JavaScript
Default Branch: main
Homepage: https://github.com/stdlib-js/stdlib
Size: 962 KB

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async asynchronous do do-while for iterate iteration javascript loop node node-js nodejs stdlib util utilities utility utils while

Created over 4 years ago · Last pushed 6 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!

doWhileAsync

Invoke a function while a test condition is true.

## Installation ```bash npm install @stdlib/utils-async-do-while ``` 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 doWhileAsync = require( '@stdlib/utils-async-do-while' ); ``` #### doWhileAsync( fcn, predicate, done\[, thisArg ] ) Invokes a `function` until a `predicate` function returns `false`. Note that the `predicate` function is evaluated **after** executing `fcn`; thus, `fcn` **always** executes at least once. ```javascript function fcn( i, next ) { setTimeout( onTimeout, 0 ); function onTimeout() { console.log( 'beep: %d', i ); next(); } } function predicate( i, clbk ) { clbk( null, i < 5 ); } function done( error ) { if ( error ) { throw error; } } doWhileAsync( fcn, predicate, done ); /* => beep: 0 beep: 1 beep: 2 beep: 3 beep: 4 */ ``` The function to invoke is provided two arguments: - `i`: iteration number (starting from zero). - `next`: a callback which must be invoked before proceeding to the next iteration. The `predicate` function is provided two arguments: - `i`: iteration number (starting from one). - `clbk`: a callback indicating whether to invoke `fcn`. The `clbk` function accepts two arguments: - `error`: error object. - `bool`: test result. If the test result is truthy, the function continues invoking `fcn`; otherwise, the function invokes the `done` callback. The first argument of both `clbk` and `next` is an `error` argument. If either function is called with a truthy `error` argument, the function suspends execution and immediately calls the `done` callback for subsequent `error` handling. ```javascript function fcn( i, next ) { setTimeout( onTimeout, 0 ); function onTimeout() { next( new Error( 'beep' ) ); } } function predicate( i, clbk ) { clbk( null, i < 5 ); } function done( error ) { console.error( error.message ); // => beep } doWhileAsync( fcn, predicate, done ); ``` The `done` callback is invoked with an `error` argument and any arguments passed to the final `next` callback. ```javascript function fcn( i, next ) { setTimeout( onTimeout, 0 ); function onTimeout() { next( null, i ); } } function predicate( i, clbk ) { clbk( null, i < 5 ); } function done( error, result ) { if ( error ) { throw error; } console.log( result ); // => 4 } doWhileAsync( fcn, predicate, done ); ``` To set the function execution context for the invoked function, provide a `thisArg`. ```javascript function fcn( i, next ) { this.count += 1; setTimeout( onTimeout, 0 ); function onTimeout() { next(); } } function predicate( i, clbk ) { clbk( null, i < 5 ); } var context = { 'count': 0 }; doWhileAsync( fcn, predicate, done, context ); function done( error ) { if ( error ) { throw error; } console.log( context.count ); // => 5 } ```

## Notes - Execution is **not** guaranteed to be asynchronous. To guarantee asynchrony, 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`).

## Examples ```javascript var repeatString = require( '@stdlib/string-repeat' ); var doWhileAsync = require( '@stdlib/utils-async-do-while' ); function fcn( i, next ) { setTimeout( onTimeout, 0 ); function onTimeout() { next( null, repeatString( 'beep', i+1 ) ); } } function predicate( i, clbk ) { setTimeout( onTimeout, 0 ); function onTimeout() { clbk( null, i < 5 ); } } function done( error, result ) { if ( error ) { throw error; } console.log( result ); } doWhileAsync( fcn, predicate, 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].

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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-do-while

Invoke a function while a test condition is true.

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

Versions: 13
Dependent Packages: 3
Dependent Repositories: 1
Downloads: 17 Last month

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Downloads: 19.1%

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planeshifter rreusser stdlib-bot kgryte

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@stdlib/bench ^0.0.x development
@stdlib/math-base-assert-is-nan ^0.0.x development
@stdlib/random-base-randu ^0.0.x development
@stdlib/string-repeat ^0.0.x development
@stdlib/utils-noop ^0.0.x development
istanbul ^0.4.1 development
tap-spec 5.x.x development
tape git+https://github.com/kgryte/tape.git#fix/globby development
@stdlib/assert-is-function ^0.0.x
@stdlib/string-format ^0.0.x

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@stdlib/utils-async-do-while

Science Score: 44.0%

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doWhileAsync

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