Mastering JavaScript Object-Oriented Programming - Programmer Books
[Pages:287]
Mastering JavaScript ObjectOriented Programming
UnleashthetruepowerofJavaScriptby masteringObjectOriented programming principles and patterns
Andrea Chiarelli
BIRMINGHAM- MUMBAI
Mastering JavaScript Object-Oriented Programming
Copyright ? 2016 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 author, 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: June 2016 Production reference: 1220616
Published by Packt Publishing Ltd. Livery Place 35 Livery Street Birmingham B3 2PB, UK.
ISBN 978-1-78588-910-3
Credits
Author Andrea Chiarelli
Copy Editor Charlotte Carneiro
Reviewer Lyubomyr Rudko
Project Coordinator Sanchita Mandal
Commissioning Editor Wilson D'souza
Proofreader Safis Editing
Acquisition Editor Larissa Pinto
Indexer Monica Ajmera Mehta
Content Development Editor Shali Deeraj
Technical Editors Gebin George
Production Coordinator Nilesh Mohite
About the Author
Andrea Chiarelli has over 20 years of experience as software engineer and technical writer. Throughout his career, he has used various technologies for the projects he was involved in, ranging from C# to JavaScript, to AngularJS, and REST to PhoneGap/Cordova. He has contributed to many online and offline magazines, such as Computer Programming and ASP Today and has coauthored a few books published by Wrox Press. Currently, he is a senior software engineer at the Italian office of Apparound Inc., a mobile software company founded in the heart of Silicon Valley, and he is a regular contributor to HTML.it, an Italian online magazine focused on web technologies. You can contact him at h t t p s : / / w w w . l i n k e d i n . c o m / i n / a n d r e a c h i a r e l l i
I wish to thank my family for their support, patience and love.
About the Reviewer
Lyubomyr Rudko is Senior Software Engineer, and has been developing large web application with JavaScript for the last 6 years. He has great experience in AngularJS, BackboneJS, React.js and Sencha ExtJS. Lyubomyr is a big fan of JavaScript language and truly enjoys sharing his skills and experience with others. Currently, he is working as a Team Technical Lead for Lohika (). You can contact him at .
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Table of Contents
Preface
1
Chapter 1: A Refresher of Objects
6
Object literals
6
Properties
7
Methods
9
Object constructors
11
The Object() constructor
13
Object prototypes
15
Using classes
16
Summary
19
Chapter 2: Diving into OOP Principles
20
OOP principles
21
Is JavaScript Object Oriented?
22
Abstraction and modeling support
22
Association
23
Aggregation
24
Composition
25
OOP principles support
25
Encapsulation
25
Inheritance
28
Polymorphism
30
JavaScript OOP versus classical OOP
34
Summary
35
Chapter 3: Working with Encapsulation and Information Hiding
36
Encapsulation and information hiding
36
Convention-based approach
37
Privacy levels using closure
38
Scope and closure
39
Privacy levels
42
Benefits and drawbacks
43
A meta-closure approach
44
Immediately invoked function expressions
44
Creating a meta-closure with an IIFE
45
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