By Sergi Mansilla
ISBN-10: 1680501291
ISBN-13: 9781680501292
Reactive programming is innovative. It makes asynchronous programming fresh, intuitive, and strong. Use the RxJS library to put in writing advanced courses in an easy manner, unifying asynchronous mechanisms similar to callbacks and gives you right into a strong information variety: the Observable. learn how to take into consideration your courses as streams of knowledge so that you can rework by means of expressing what may still occur, rather than having to painstakingly application the way it may still occur. deal with real-world concurrency and write complicated flows of occasions on your functions very easily.
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Extra resources for Reactive Programming with RxJS: Untangle Your Asynchronous JavaScript Code
Example text
If we’re using synchronous Observables, it would have the same effect as an infinite loop. Second, retry will always retry the whole Observable sequence again, even if some of the items didn’t error. This is important in case you’re causing any side effects when processing items, since they will be reapplied with every retry. Making a Real-Time Earthquake Visualizer Using the concepts that we’ve covered so far in this chapter, we’ll build a web application that uses RxJS to show us where earthquakes are happening in real time.
Explicit Cancellation: The Disposable Observables themselves don’t have a method to get canceled. Instead, whenever we subscribe to an Observable we get a Disposable object that represents that particular subscription. We can then call the method dispose in that object, and that subscription will stop receiving notifications from the Observable. In the following example, we subscribe two Observers to the counter Observable, which emits an increasing integer every second. dispose(); }, 2000); ❮ Subscription 1: 0 Subscription 2: 0 Subscription 1: 1 Subscription 2: 1 Canceling subscription2!
Making a Real-Time Earthquake Visualizer Using the concepts that we’ve covered so far in this chapter, we’ll build a web application that uses RxJS to show us where earthquakes are happening in real time. We’ll start by building a functional but naive reactive implementation, and we’ll improve it as we go. S. Geological Survey) earthquake database,1 which offers a real-time earthquake dataset in several formats. We will get our data from the weekly dataset in JSONP format. 1. info report erratum • discuss Chapter 2.
Reactive Programming with RxJS: Untangle Your Asynchronous JavaScript Code by Sergi Mansilla
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