February 2019
Beginner
694 pages
18h 4m
English
Content preview from Mastering TypeScript 3 - Third Edition
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Promises
Promises are a technique for standardizing asynchronous processing in JavaScript. Remember that there are many occasions where a function is called in JavaScript, but the actual results are only received after a period of time. These occasions typically arise when your code is requesting a resource of some sort, such as posting a request to a web server for some JSON data, or reading a file from disk. The standard JavaScript technique for asynchronous processing is the callback mechanism.
Unfortunately, when working with a lot of callbacks, our code can sometimes become rather complex and repetitive. Promises provide a way of simplifying this callback code. To start off our discussion on promises, let's take a look at some typical ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.