Book Image

Object-Oriented JavaScript - Third Edition

By : Ved Antani, Stoyan STEFANOV
5 (1)
Book Image

Object-Oriented JavaScript - Third Edition

5 (1)
By: Ved Antani, Stoyan STEFANOV

Overview of this book

JavaScript is an object-oriented programming language that is used for website development. Web pages developed today currently follow a paradigm that has three clearly distinguishable parts: content (HTML), presentation (CSS), and behavior (JavaScript). JavaScript is one important pillar in this paradigm, and is responsible for the running of the web pages. This book will take your JavaScript skills to a new level of sophistication and get you prepared for your journey through professional web development. Updated for ES6, this book covers everything you will need to unleash the power of object-oriented programming in JavaScript while building professional web applications. The book begins with the basics of object-oriented programming in JavaScript and then gradually progresses to cover functions, objects, and prototypes, and how these concepts can be used to make your programs cleaner, more maintainable, faster, and compatible with other programs/libraries. By the end of the book, you will have learned how to incorporate object-oriented programming in your web development workflow to build professional JavaScript applications.
Table of Contents (25 chapters)
Object-Oriented JavaScript - Third Edition
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
Built-in Functions
Regular Expressions

Subclassing


So far, we discussed how to declare classes and the types of members classes can support. A major use of a class is to serve as a template to create other subclasses. When you create a child class from a class, you derive properties of the parent class and extend the parent class by adding more features of its own.

Let's look at the following de facto example of inheritance:

    class Animal {  
      constructor(name) { 
        this.name = name; 
      } 
        speak() { 
        console.log(this.name + ' generic noise'); 
      } 
    } 
    class Cat extends Animal { 
      speak() { 
        console.log(this.name + ' says Meow.'); 
      } 
    } 
    var c = new Cat('Grace');  
    c.speak();//"Grace says Meow." 

Here, Animal is the base class and the Cat class is derived from the class Animal. The extend clause allows you to create a subclass of an existing class. This example demonstrates the syntax...