November 2019
Beginner
804 pages
20h 1m
English
Content preview from Learn TypeScript 3 by Building Web Applications
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Change detection
Angular can feel pretty magical when you start using it.
For instance, how does it know when inputs change? How does it re-render elements? We won't be able to delve very deeply into how things work under the hood, but we can at least give you a rough idea.
When Angular is loaded, it patches many browser APIs in order to know when some things happen. Most of these patches are handled by the zone.js (https://github.com/angular/zone.js) library that Angular uses (and which might also get standardized at some point in the future). Thanks to those patches, Angular knows when buttons are clicked on, when event listeners are triggered, when (most) asynchronous operations are completed, and more.
When Angular notices that something ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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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.