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2018/6/1 Learning JavaScript Design Patterns

https://addyosmani.com/resources/essentialjsdesignpatterns/book/ 1/202

Learning JavaScript Design Paerns

A book by Addy Osmani

Volume 1.7.0

Learning JavaScript Design Paerns is released under a Creative Commons Aribution-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.

Preface

Design paerns are reusable solutions to commonly occurring problems in software design. They are

both exciting and a fascinating topic to explore in any programming language.

2018/6/1 Learning JavaScript Design Patterns

https://addyosmani.com/resources/essentialjsdesignpatterns/book/ 2/202

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 aempting to solve.

Design paerns also provide us a common vocabulary to describe solutions. This can be signiﬁcantly

simpler than describing syntax and semantics when we're aempting 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 paerns to the JavaScript

programming language.

Target Audience

This book is targeted at professional developers wishing to improve their knowledge of design paerns

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 wholeheartedly recommend checking them out.

Nicholas Zakas (hp://nczonline.net, @slicknet)

Andrée Hansson (hp://andreehansson.se, @peolanha)

Luke Smith (hp://lucassmith.name, @ls_n)

Eric Ferraiuolo (hp://ericf.me/, @ericf)

Peter Michaux (hp://michaux.ca, @petermichaux)

Alex Sexton (hp://alexsexton.com, @slexaxton)

I would also like to thank Rebecca Murphey (hp://rmurphey.com, @rmurphey) for providing the

inspiration to write this book and more importantly, continue to make it both available on GitHub and

2018/6/1 Learning JavaScript Design Patterns

https://addyosmani.com/resources/essentialjsdesignpatterns/book/ 5/202

One of the most important aspects of writing maintainable code is being able to notice the recurring

themes in that code and optimize them. This is an area where knowledge of design paerns can prove

invaluable.

In the ﬁrst part of this book, we will explore the history and importance of design paerns which can

really be applied to any programming language. If you're already sold on or are familiar with this

history, feel free to skip to the chapter "What is a Paern?" to continue reading.

Design paerns can be traced back to the early work of an architect named Christopher Alexander. He

would often write publications about his experience in solving design issues and how they related to

buildings and towns. One day, it occurred to Alexander that when used time and time again, certain

design constructs lead to a desired optimal eﬀect.

In collaboration with Sara Ishikawa and Murray Silverstein, Alexander produced a paern language that

would help empower anyone wishing to design and build at any scale. This was published back in 1977

in a paper titled "A Paern Language", which was later released as a complete hardcover book.

Some 30 years ago, software engineers began to incorporate the principles Alexander had wrien about

into the ﬁrst documentation about design paerns, which was to be a guide for novice developers

looking to improve their coding skills. It's important to note that the concepts behind design paerns

have actually been around in the programming industry since its inception, albeit in a less formalized

form.

One of the ﬁrst and arguably most iconic formal works published on design paerns in software

engineering was a book in 1995 called Design Paerns: Elements Of Reusable Object-Oriented Software. This

was wrien by Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides - a group that became

known as the Gang of Four (or GoF for short).

The GoF's publication is considered quite instrumental to pushing the concept of design paerns further

in our ﬁeld as it describes a number of development techniques and pitfalls as well as providing twenty-

three core Object-Oriented design paerns frequently used around the world today. We will be covering

these paerns in more detail in the section "Categories of Design Paerns".

In this book, we will take a look at a number of popular JavaScript design paerns and explore why

certain paerns may be more suitable for your projects than others. Remember that paerns can be

applied not just to vanilla JavaScript (i.e standard JavaScript code), but also to abstracted libraries such as

jQuery or dojo as well. Before we begin, let’s look at the exact deﬁnition of a "paern" in software design.

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