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

Defining classes

Under the hood, classes are special functions. Just like you can define functions using function expressions and declarations, you can define classes as well. One way to define classes is using class declaration.

You can use the class keyword and the name of the class. This syntax is very similar to that of Java or C#:

    class Car { 
      constructor(model, year){ 
        this.model = model; 
        this.year = year; 
    console.log(typeof Car); //"function" 

To establish the fact that classes are a special function, if we get the typeof the Car class, we will get a function.

There is an important distinction between classes and normal functions. While normal functions are hoisted, classes are not. A normal function is available immediately when you enter a scope in which it is declared; this is called hoisting, which means that a normal function can be declared anywhere in the scope, and it will be available. However...