December 2018
Intermediate to advanced
196 pages
4h 48m
English
Content preview from Build Reactive Websites with RxJSBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Promises vs. Observables with AJAX
A question that always comes up when discussing using observables to make AJAX requests is: “Why not promises?” As we learned in Chapter 1, Creating Observables, a promise represents a single value delivered over time where an observable represents multiple values. An AJAX request is a single value—why complicate things?
Promises are simpler in concept, but the real world always complicates things. Pretend you’re developing the mobile platform for a ridesharing app. Users will typically use the app outside, away from solid Wi-Fi. They’re trying to get somewhere, so they have a low tolerance for latency and errors. With that in mind, we’ll use the following code to build the best user experience for updating ...
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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.