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• promises are objects that represent the result of an async computation • once a promise is settled, it stays settled, and remembers its result • you can call a promise’s then() method more than once and it will
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JavaScript with Promises. Asynchronous JavaScript is everywhere, whether you’re using Ajax, AngularJS, Node.js, or WebRTC. This practical guide shows intermediate to advanced JavaScript developers how Promises can help you manage asynchronous code effectively—including the inevitable flood of callbacks as your codebase grows.
Jan 18, 2024 · Explore JavaScript Promises with exercises on random resolution, chained arithmetic, parallel data fetching, fastest response, and cancellation. Improve your async skills with concise code and clear explanations. Learn effective methods for handling promises, simplifying errors, and creating resilient, maintainable code.
The Promises specification (Promises/A+, 2013) defines only a single interface and leaves the details of completing (or fulfilling) the promise to the implementer of the spec. Promises in JavaScript are also asynchronous and able to be pipelined.
In this book, you'll learn all of the ins and outs of promises, from basics such as how to create promises all the way to understanding how async functions work with promises behind-the-scenes.
Oct 9, 2024 · JavaScript promises might sound a bit complicated at first, but once you get a clear understanding of them, they make working with code that takes time to complete, like fetching data from a website or waiting for a timer, much easier to manage. Let’s break down what promises are and how you can use them.
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Jun 23, 2024 · A promise is a special JavaScript object that links the “producing code” and the “consuming code” together. In terms of our analogy: this is the “subscription list”. The “producing code” takes whatever time it needs to produce the promised result, and the “promise” makes that result available to all of the subscribed code when it’s ready.
