when.js
A Promises/A+ and when() implementation with async utilities for JavaScript.
What is when.js?
When.js is a Promises/A+ compliant library that provides a fast `when()` implementation and additional async utilities for JavaScript. It simplifies managing complex callback flows by converting them into promise-based APIs, improving code readability and maintainability.
JavaScript developers working with asynchronous operations, especially those needing Promises/A+ compliance, ES6 Promise support, or utilities for handling promise collections and task execution.
Developers choose When.js for its combination of small size, high performance, debuggability, and rich features like promise collection resolution and callback transformation, making it a robust alternative to native promises or other promise libraries.
Overview
A solid, fast Promises/A+ and when() implementation, plus other async goodies.
Use Cases
Best For
- Converting Node-style callback APIs to promise-based APIs
- Handling arrays or hashes of promises with built-in resolution methods
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