Mastering JavaScript Design Patterns

Simon Timms

• Verlag: Packt Publishing
• Jahr: 2014
• ISBN:
  9781783987986
• Auflage: 1
• Thema: Informatica
• Thema: Programmazione web

Applying design patterns to JavaScript code creates more reliable and maintainable code. In this book, you will explore different design patterns and learn where and how to implement them with the help of detailed examples.

In the first part of the book, we start off with an introduction to design patterns, and then move on to creating classical structures that are used to organize code. Next, we look at the creational, structural, and behavioral patterns. The second part of the book dives into patterns used for functional programming, model view patterns, patterns to build web applications, and messaging patterns. A number of very interesting advanced JavaScript patterns such as dependency injection and live postprocessing are also covered.

By the end of this book, you will learn to identify places where a pattern would improve code readability and maintainability.

Mastering JavaScript Design Patterns

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Table of Contents

Mastering JavaScript Design Patterns

Credits

About the Author

About the Reviewers

www.PacktPub.com

Support files, eBooks, discount offers, and more

Why subscribe?

Free access for Packt account holders

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

1. Designing for Fun and Profit

The road to JavaScript

The early days

A pause

The way of Gmail

JavaScript everywhere

What is a design pattern?

Antipatterns

Summary

I. Classical Design Patterns

2. Organizing Code

Chunks of code

What's the matter with global scope anyway?

Objects in JavaScript

Build me a prototype

Inheritance

Modules

ECMAScript 6 classes and modules

Best practices and troubleshooting

Summary

3. Creational Patterns

Abstract Factory

Implementation

Builder

Implementation

Factory Method

Implementation

Singleton

Implementation

Disadvantages

Prototype

Implementation

Hints and tips

Summary

4. Structural Patterns

Adapter

Implementation

Bridge

Implementation

Composite

An example

Implementation

Decorator

Implementation

Façade

Implementation

Flyweight

Implementation

Proxy

Implementation

Hints and tips

Summary

5. Behavioral Patterns

Chain of responsibility

Implementation

Command

The command message

The invoker

The receiver

Interpreter

An example

Implementation

Iterator

Implementation

ECMAScript 6 iterators

Mediator

Implementation

Memento

Implementation

Observer

Implementation

State

Implementation

Strategy

Implementation

Template method

Implementation

Visitor

Hints and tips

Summary

II. Other Patterns

6. Functional Programming

Functional functions are side-effect free

Function passing

Implementation

Filters and pipes

Implementation

Accumulators

Implementation

Memoization

Implementation

Immutability

Lazy instantiation

Implementation

Hints and tips

Summary

7. Model View Patterns

First, some history

Model View Controller

The MVC code

Model View Presenter

The MVP code

Model View ViewModel

The MVVM code

A better way to transfer changes between the model and the view

Observing view changes

Hints and tips

Summary

8. Web Patterns

Sending JavaScript

Combining files

Minification

Content delivery networks

Plugins

jQuery

d3

Doing two things at once – multithreading

The circuit breaker pattern

Back-off

Degraded application behavior

The promise pattern

Hints and tips

Summary

9. Messaging Patterns

What's a message anyway?

Commands

Events

Request-reply

Publish-subscribe

Fan out and fan in

Dead-letter queues

Message replay

Pipes and filters

Versioning messages

Hints and tips

Summary

10. Patterns for Testing

The testing pyramid

Test in the small with unit tests

Arrange-Act-Assert

Asserts

Fake objects

Test spies

Stub

Mock

Monkey patching

Interacting with the user interface

Browser testing

Faking the DOM

Wrapping the manipulation

Build and test tools

Hints and tips

Summary

11. Advanced Patterns

Dependency injection

Live postprocessing

Aspect-oriented programming

Macros

Hints and tips

Summary

12. ES6 Solutions Today

TypeScript

The class syntax

The module syntax

Arrow functions

Typing

Traceur

Classes

Default parameters

Template literals

Block bindings with let

Async

Conclusion

Hints and tips

Summary

A. Conclusion

Index

Mastering JavaScript Design Patterns

Copyright © 2014 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.

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First published: November 2014

Production reference: 1151114

Published by Packt Publishing Ltd.

Livery Place

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Birmingham B3 2PB, UK.

ISBN 978-1-78398-798-6

www.packtpub.com

Credits

Author

Simon Timms

Reviewers

Amrita Chaturvedi

Philippe Renevier Gonin

Pedro Miguel Barros Morgado

Mani Nilchiani

Commissioning Editor

Kunal Parikh

Acquisition Editor

Meeta Rajani

Content Development Editor

Sweny M. Sukumaran

Technical Editor

Siddhi Rane

Copy Editor

Laxmi Subramanian

Project Coordinator

Rashi Khivansara

Proofreaders

Simran Bhogal

Lawrence A. Herman

Elinor Perry-Smith

Indexer

Hemangini Bari

Graphics

Sheetal Aute

Ronak Dhruv

Valentina D'silva

Disha Haria

Abhinash Sahu

Production Coordinator

Nitesh Thakur

Cover Work

Nitesh Thakur

About the Author

Simon Timms is a developer who loves to write code. He writes in a variety of languages using a number of tools. For the most part, he develops web applications with .NET backends. He is very interested in visualizations and cloud computing. A background in build and system administration keeps him on the straight and narrow when it comes to DevOps.

He is the author of Social Data Visualization with HTML5 and JavaScript, Packt Publishing. He blogs at http://blog.simontimms.com/ and is also a frequent contributor to the Canadian Developer Connection, where his latest series explores evolving ASP.NET applications.

He is the President of the Calgary .NET User Group and a member of half a dozen others. He speaks on a variety of topics from DevOps to how the telephone system works.

He works as a web developer for Pacesetter Directional Drilling, the friendliest performance drilling company around.

I would like to thank my wonderful wife for all her support and my children who provided a welcome distraction from writing. I would also like to thank the Prime team at Pacesetter for their sense of humor and for putting up with me.

About the Reviewers

Amrita Chaturvedi is a PhD researcher in the Department of Computer Science and Engineering at Indian Institute of Technology, Kanpur, Uttar Pradesh, India (http://www.cse.iitk.ac.in/users/amrita/index.htm). She was schooled (kindergarten to intermediate) at City Montessori School, Aliganj, Lucknow, Uttar Pradesh, India. She received a Bachelor of Technology degree in Information Technology from Institute of Engineering and Technology, Lucknow, Uttar Pradesh, India and a Master of Technology degree in Information Technology (with a specialization in Software Engineering) from Indian Institute of Information Technology, Allahabad (Deemed University), Uttar Pradesh, India. She has worked in Nucleus Software Exports Ltd., Noida, Uttar Pradesh, India as a software engineer. She was also employed as a faculty in Institute of Engineering and Technology, Lucknow, Uttar Pradesh, India. She has worked in user interface design as a senior project associate at Indian Institute of Technology, Kanpur, Uttar Pradesh, India. She was selected as the first female PhD student from Asia under EURECA (European Research and Educational Collaboration with Asia) project 2009 to conduct research at VU University Amsterdam, the Netherlands. Her areas of specialization are software engineering, software architecture, software design patterns, and ontologies. Her research interests include software architecture and design, ontologies-based software engineering, service-oriented and model-driven architecture, semantic web, Internet technologies, and mobile agents.

She has given several talks and seminars as well as conference welcome/key notes at international conferences. She has also earned various awards such as best paper award for her research paper in an international conference, ACM SIGAPP award, and has also been a Physics Olympiad topper. She has traveled several European, North American, African, and Asian countries for educational/conference/research purposes. She has teaching as well as research exper...