Object-Oriented JavaScript - HDFC Sec

Object-Oriented JavaScript

Second Edition

Learn everything you need to know about OOJS in this comprehensive guide

Stoyan Stefanov Kumar Chetan Sharma

BIRMINGHAM - MUMBAI

Object-Oriented JavaScript

Second Edition

Copyright ? 2013 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews. Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the authors, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book. Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

First published: July 2008 Second edition: July 2013

Production Reference: 1190713

Published by Packt Publishing Ltd. Livery Place 35 Livery Street Birmingham B3 2PB, UK. ISBN 978-1-84969-312-7 Cover Image by Gorkee Bhardwaj (afterglowpictures@)

Credits

Authors Stoyan Stefanov Kumar Chetan Sharma

Reviewers Kumar Chetan Sharma Alex R. Young

Acquisition Editors Martin Bell Jonathan Titmus

Lead Technical Editor Arun Nadar

Technical Editors Prasad Dalvi Mausam Kothari Worrell Lewis Amit Ramadas

Project Coordinator Leena Purkait

Proofreaders Paul Hindle Linda Morris

Indexer Rekha Nair

Graphics Ronak Dhruv

Production Coordinator Arvindkumar Gupta

Cover Work Arvindkumar Gupta

About the Authors

Stoyan Stefanov is a Facebook engineer, author, and speaker. He talks regularly

about web development topics at conferences and his blog , and also runs a number of other sites, including --a site dedicated to exploring JavaScript patterns. Previously at Yahoo!, Stoyan was the architect of YSlow 2.0 and creator of the image optimization tool Smush.it.

A "citizen of the world", Stoyan was born and raised in Bulgaria, but is also a Canadian citizen, currently residing in Los Angeles, California. In his offline moments, he enjoys playing the guitar, taking flying lessons, and spending time at the Santa Monica beaches with his family.

I'd like to dedicate this book to my wife Eva and my daughters Zlatina and Nathalie. Thank you for your patience, support, and encouragement.

To my reviewers who volunteered their time reviewing drafts of this book and whom I deeply respect and look up to: a big thank you for your invaluable inputs.

Kumar Chetan Sharma studied to be an electronics engineer and has always

wanted to build an ultimate sound system. He then, by chance, got a part time job as a trainee HTML guy. From there he picked up CSS and JavaScript and there was no looking back. It was the time when JavaScript was used to validate forms or create fancy DHTML effects and IE6 was the only browser the world knew. He has been developing web applications since then, using LAMP stack. He has worked on white label social networking applications to web control panels for telecom and networked electrical charger infrastructures. He currently works as a frontend engineer for Yahoo! Search.

About the Reviewer

Alex R. Young is an engineering graduate with over 10 years of web and mobile

industry experience. He's the editor-in-chief of DailyJS, and writes regularly about all things JavaScript. He has also worked for major multinational corporations, including Thomson Reuters, and is currently writing a book about Node.



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Table of Contents

Preface

1

Chapter 1: Object-oriented JavaScript

7

A bit of history

8

Browser wars and renaissance

9

The present

10

The future

11

ECMAScript 5

12

Object-oriented programming

12

Objects

13

Classes

13

Encapsulation

14

Aggregation

15

Inheritance

15

Polymorphism

16

OOP summary

16

Setting up your training environment

17

WebKit's Web Inspector

17

JavaScriptCore on a Mac

18

More consoles

19

Summary

20

Chapter 2: Primitive Data Types, Arrays, Loops, and Conditions 21

Variables

21

Variables are case sensitive

23

Operators

24

Primitive data types

28

Finding out the value type ? the typeof operator

28

Numbers

29

Octal and hexadecimal numbers

29

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