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Learning JavaScript Design Patterns.pdf

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2016/5/2 Learning JavaScript Design Patterns

https://addyosmani.com/resources/essentialjsdesignpatterns/book/ 1/232

Learning JavaScript Design Patterns

A book by Addy Osmani

Volume 1.6.2

Learning JavaScript Design Patterns is released under a Creative Commons Attribution-

Noncommercial-No Derivative Works 3.0 unported license. It is available for purchase

via O'Reilly Media but will remain available for both free online and as a physical (or

eBook) purchase for readers wishing to support the project.



2016/5/2 Learning JavaScript Design Patterns

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Preface

Design patterns are reusable solutions to commonly occurring problems in software

design. They are both exciting and a fascinating topic to explore in any programming

language.

One reason for this is that they help us build upon the combined experience of many

developers that came before us and ensure we structure our code in an optimized way,

meeting the needs of problems we're attempting to solve.

Design patterns also provide us a common vocabulary to describe solutions. This can be

signiﬁcantly simpler than describing syntax and semantics when we're attempting to

convey a way of structuring a solution in code form to others.

In this book we will explore applying both classical and modern design patterns to the

JavaScript programming language.



Target Audience

This book is targeted at professional developers wishing to improve their knowledge of

design patterns and how they can be applied to the JavaScript programming language.

Some of the concepts covered (closures, prototypal inheritance) will assume a level of

basic prior knowledge and understanding. If you ﬁnd yourself needing to read further

about these topics, a list of suggested titles is provided for convenience.

If you would like to learn how to write beautiful, structured and organized code, I

believe this is the book for you.

Acknowledgments

I will always be grateful for the talented technical reviewers who helped review and

improve this book, including those from the community at large. The knowledge and

enthusiasm they brought to the project was simply amazing. The ofﬁcial technical

reviewers tweets and blogs are also a regular source of both ideas and inspiration and I

2016/5/2 Learning JavaScript Design Patterns

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wholeheartedly recommend checking them out.

Nicholas Zakas (http://nczonline.net, @slicknet)

Andrée Hansson (http://andreehansson.se, @peolanha)

Luke Smith (http://lucassmith.name, @ls_n)

Eric Ferraiuolo (http://ericf.me/, @ericf)

Peter Michaux (http://michaux.ca, @petermichaux)

Alex Sexton (http://alexsexton.com, @slexaxton)

I would also like to thank Rebecca Murphey (http://rmurphey.com, @rmurphey) for

providing the inspiration to write this book and more importantly, continue to make it

both available on GitHub and via O'Reilly.

Finally, I would like to thank my wonderful wife Ellie, for all of her support while I was

putting together this publication.

Credits

Whilst some of the patterns covered in this book were implemented based on personal

experience, many of them have been previously identiﬁed by the JavaScript community.

This work is as such the production of the combined experience of a number of

developers. Similar to Stoyan Stefanov's logical approach to preventing interruption of

the narrative with credits (in JavaScript Patterns), I have listed credits and suggested

reading for any content covered in the references section.

If any articles or links have been missed in the list of references, please accept my

heartfelt apologies. If you contact me I'll be sure to update them to include you on the

list.

Reading

Whilst this book is targeted at both beginners and intermediate developers, a basic

understanding of JavaScript fundamentals is assumed. Should you wish to learn more

about the language, I am happy to recommend the following titles:

JavaScript: The Deﬁnitive Guide by David Flanagan

Eloquent JavaScript by Marijn Haverbeke

JavaScript Patterns by Stoyan Stefanov

2016/5/2 Learning JavaScript Design Patterns
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Writing Maintainable JavaScript by Nicholas Zakas
JavaScript: The Good Parts by Douglas Crockford
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Table Of Contents
Introduction
What is a Pattern?
"Pattern"-ity Testing, Proto-Patterns & The Rule Of Three
The Structure Of A Design Pattern
Writing Design Patterns
Anti-Patterns
Categories Of Design Pattern
Summary Table Of Design Pattern Categorization
JavaScript Design Patterns
Constructor Pattern
Module Pattern
Revealing Module Pattern
Singleton Pattern
Observer Pattern
Mediator Pattern
Prototype Pattern
Command Pattern
Facade Pattern
Factory Pattern
Mixin Pattern
Decorator Pattern
Flyweight Pattern
JavaScript MV* Patterns
MVC Pattern
MVP Pattern
MVVM Pattern
Modern Modular JavaScript Design Patterns
AMD
CommonJS
ES Harmony
Design Patterns In jQuery
Composite Pattern