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

Using the prototype's methods and properties


All the methods and properties you have added to the prototype are available as soon as you create a new object using the constructor. If you create a newtoy object using the Gadget() constructor, you can access all the methods and properties that are already defined, as you can see in the following code:

    > var newtoy = new Gadget('webcam', 'black'); 
    > newtoy.name; 
    "webcam" 
    > newtoy.color; 
    "black" 
    > newtoy.whatAreYou(); 
    "I am a black webcam" 
    > newtoy.price; 
    100 
    > newtoy.rating; 
    3 
    > newtoy.getInfo(); 
    "Rating: 3, price: 100" 

It's important to note that the prototype is live. Objects are passed by reference in JavaScript, and therefore, the prototype is not copied with every new object instance. What does this mean in practice? It means that you can modify the prototype at any time, and all the objects...