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Object-Oriented JavaScript

You're reading from   Object-Oriented JavaScript Learn everything you need to know about object-oriented JavaScript (OOJS)

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Product type Paperback
Published in Jan 2017
Publisher Packt
ISBN-13 9781785880568
Length 550 pages
Edition 3rd Edition
Languages
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Authors (2):
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Ved Antani Ved Antani
Author Profile Icon Ved Antani
Ved Antani
Stoyan STEFANOV Stoyan STEFANOV
Author Profile Icon Stoyan STEFANOV
Stoyan STEFANOV
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Table of Contents (25) Chapters Close

Object-Oriented JavaScript - Third Edition
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
1. Object-Oriented JavaScript FREE CHAPTER 2. Primitive Data Types, Arrays, Loops, and Conditions 3. Functions 4. Objects 5. ES6 Iterators and Generators 6. Prototype 7. Inheritance 8. Classes and Modules 9. Promises and Proxies 10. The Browser Environment 11. Coding and Design Patterns 12. Testing and Debugging 13. Reactive Programming and React Reserved Words Built-in Functions
Built-in Objects Regular Expressions
Answers to Exercise Questions

Uber - access to the parent from a child object


Classical OO languages usually have a special syntax that gives you access to the parent class, also referred to the superclass. This could be convenient when a child wants to have a method that does everything the parent's method does, plus something in addition to it. In such cases, the child calls the parent's method with the same name and works with the result.

In JavaScript, there is no such special syntax, but it's trivial to achieve the same functionality. Let's rewrite the last example, and while taking care of inheritance, also create an uber property that points to the parent's prototype object:

    function Shape() {} 
    // augment prototype 
    Shape.prototype.name = 'Shape'; 
    Shape.prototype.toString = function () { 
    var const = this.constructor; 
    returnconst.uber 
        ? this.const.uber.toString() + ', ' + this.name 
        : this.name; 
    }; 
 
    function...
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