June 2019
Intermediate to advanced
192 pages
4h
English
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The Controllable Pattern
Components in React are commonly described as controlled or uncontrolled with respect to some variable. If that variable is passed down to it through props, the component is controlled. If that variable is managed as state, the component is uncontrolled.
In its original incarnation, Carousel was uncontrolled with respect to slideIndex. With the HasIndex refactoring, the core of Carousel is now controlled, but the overall component—the version of Carousel that this library’s users will consume—is still uncontrolled. Nothing outside of Carousel can modify its slideIndex, because that variable is kept in state.
Suppose you removed the HasIndex wrapper to make Carousel controlled. That would make the component more versatile, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.