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
About the Authors
About the Reviewer
Customer Feedback
Built-in Functions
Regular Expressions

The prototype property

The functions in JavaScript are objects, and they contain methods and properties. Some of the methods that you're already familiar with are apply() and call(), and some of the other properties are length and constructor. Another property of the function objects is prototype.

If you define a simple function, foo(), you can access its properties as you would do with any other object. Consider the following code:

    > function foo(a, b) { 
        return a * b; 
    > foo.length; 
    > foo.constructor; 
    function Function() { [native code] } 

The prototype property is a property that is available to you as soon as you define the function. Its initial value is an empty object:

    > typeof foo.prototype; 

It's as if you have added this property yourself, as follows:

    > foo.prototype = {}; 

You can augment this empty object with properties and methods. They won't have any...