when
A solid, fast Promises/A+ and when() implementation, plus other async goodies. (by cujojs)
q
A promise library for JavaScript (by kriskowal)
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| when | q | |
|---|---|---|
| 3 | 9 | |
| 3,440 | 14,957 | |
| -0.2% | - | |
| 1.8 | 0.0 | |
| about 2 years ago | 6 months ago | |
| JavaScript | JavaScript | |
| GNU General Public License v3.0 or later | MIT License |
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
when
Posts with mentions or reviews of when.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2021-07-02.
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If you are making a library, take a good look at this list!
looking at you "When"!
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I made a small library for handling async events in a type-safe fashion
If you're wondering, number 2 has happened to me years ago, and required debugging a Promises library (back when Promises weren't native): https://github.com/cujojs/when/issues/325
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Introduction to Asynchronous JavaScript
Promises are a popular way of getting rid of callback hell. Originally it was a type of construct introduced by JavaScript libraries like Q and when.js, but these types of libraries became popular enough that promises are now provided natively in ECMAScript 6.
q
Posts with mentions or reviews of q.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2022-07-14.
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How to make Ajax request through NodeJS to an endpoint
How can I achieve this in NodeJS. I wonder if Q Library can be utilized in this case
- WTF ¿Qué es una promesa en Javascript?
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es6-cheatsheet
Prior to ES6, we used bluebird or Q. Now we have Promises natively:
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One programming concept that took you a while to understand, and how it finally clicked for you
JavaScript Promises were a nightmare to wrap my head around. Not the fancy async/await syntax we have now, but the early stuff like kriskowal’s q. Wasn’t really until Promise was native did I fully understand it. Someone told me “the .then function only runs if you call resolve() in the previous block”. I think that’s what made it click.
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How to specify resolution and rejection type of the promise in JSDoc?
I have some code that returns a promise object, e.g. using Q library for NodeJS.
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Resolved Promises and Promise Fates
Before promises arrived natively in JS, there were(and still are) many separate independent promise implementations in the form of third-party libraries for example Q, RSVP, etc. Even jQuery has its own custom implementation that they call deferreds. The name and the implementation might differ from library to library but the intention is the same, making asynchronous code behave like synchronous code.
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Introduction to Asynchronous JavaScript
Promises are a popular way of getting rid of callback hell. Originally it was a type of construct introduced by JavaScript libraries like Q and when.js, but these types of libraries became popular enough that promises are now provided natively in ECMAScript 6.
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7 tips for a Node.js developer
Another great library is Q https://github.com/kriskowal/q. This library is exposes the concept of promises. A promise is basically an object that is returned from a method with the “promise” that it will eventually provide a return value. This ties is very neatly with the asynchronous nature of javascript and node.js.
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How to Return multiple functions and values while working with REST APIs (Part 1)
q : This module is used for creating custom promises. Check it out here
What are some alternatives?
When comparing when and q you can also consider the following projects:
Bluebird - :bird: :zap: Bluebird is a full featured promise library with unmatched performance.
async - Async utilities for node and the browser
step - An async control-flow library that makes stepping through logic easy.
contra - :surfer: Asynchronous flow control with a functional taste to it
angular-async-loader - Load modules and components asynchronously for angular 1.x application.
ObjectEventTarget - A same behaviour EventTarget prototype, that can work with any object from JavaScript
Javascript State Machine - A javascript finite state machine library
modern-async - A modern JavaScript tooling library for asynchronous operations using async/await, promises and async generators