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Object-Oriented JavaScript

You're reading from   Object-Oriented JavaScript

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Product type Paperback
Published in Jul 2008
Publisher
ISBN-13 9781847194145
Length 356 pages
Edition Edition
Languages
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Toc

Table of Contents (18) Chapters Close

Object-Oriented JavaScript
Credits
About the Author
About the Reviewers
Preface
1. Introduction 2. Primitive Data Types, Arrays, Loops, and Conditions FREE CHAPTER 3. Functions 4. Objects 5. Prototype 6. Inheritance 7. The Browser Environment 8. Coding and Design Patterns Reserved Words Built-in Functions
Built-in Objects Regular Expressions
Index

Objects Inherit from Objects


All of the examples so far in this chapter assume that you create your objects with constructor functions and you want objects created with one constructor to inherit properties that come from another constructor. However, you can also create objects without the help of a constructor function, just by using the object literal and this is, in fact, less typing. So how about inheriting those?

In Java or PHP, you define classes and have them inherit from other classes. Hence the name, classical, because the OO functionality comes from the use of classes. In JavaScript, there are no classes so programmers that come from a classical background resort to constructor functions because it's the closest to what they are used to. In addition, JavaScript provides the new operator, which can further suggest that JavaScript is like Java. The truth is that, in the end, it all comes back to objects. The first example in this chapter used this syntax:

Child.prototype = new Parent...
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