By Nicholas C. Zakas
ISBN-10: 1593275773
ISBN-13: 9781593275778
If you've used a extra conventional object-oriented language, similar to C++ or Java, JavaScript most likely doesn't appear object-oriented in any respect. It has no proposal of periods, and also you don't even have to outline any gadgets so one can write code. yet don't be fooled--JavaScript is an extremely strong and expressive object-oriented language that places many layout judgements correct into your hands.
In The rules of Object-Oriented JavaScript, Nicholas C. Zakas completely explores JavaScript's object-oriented nature, revealing the language's designated implementation of inheritance and different key features.
You'll examine:
• the variation among primitive and reference values.
• What makes JavaScript features so unique
• a few of the how one can create objects
• how to find your individual constructors
• find out how to paintings with and comprehend prototypes
• Inheritance styles for kinds and objects
The rules of Object-Oriented JavaScript will go away even skilled builders with a deeper realizing of JavaScript. release the secrets and techniques at the back of how gadgets paintings in JavaScript so that you can write clearer, extra versatile, and extra effective code.
Read Online or Download The Principles of Object-Oriented JavaScript PDF
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Extra info for The Principles of Object-Oriented JavaScript
Sample 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.
The Principles of Object-Oriented JavaScript by Nicholas C. Zakas
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