RxJS in Action

Foreword

It’s no secret that the web has grown dramatically in popularity as a platform for building large-scale, high-traffic applications. Modern web applications are somewhat unique in the computing world, however, because they require a great deal of asynchrony, ranging from AJAX requests to animations to lazy-loaded client resources and multiplexed web sockets. And all this asynchrony comes with a complexity cost.

A simple drag and drop, for example, is actually a coordination of three or more different events: wait for a mouse-down and then listen to all mouse movements until the next mouse-up. Current imperative approaches to implement this sort of thing are not always straightforward; they’re difficult to maintain, and they’re rarely ...