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Douglas Crockford - JavaScript

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JavaScript: summary, description and annotation

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Most programming languages contain good and bad parts, but JavaScript has more than its share of the bad, having been developed and released in a hurry before it could be refined. This authoritative book scrapes away these bad features to reveal a subset of JavaScript thats more reliable, readable, and maintainable than the language as a whole-a subset you can use to create truly extensible and efficient code.

Considered the JavaScript expert by many people in the development community, author Douglas Crockford identifies the abundance of good ideas that make JavaScript an outstanding object-oriented programming language-ideas such as functions, loose typing, dynamic objects, and an expressive object literal notation. Unfortunately, these good ideas are mixed in with bad and downright awful ideas, like a programming model based on global variables.

When Java applets failed, JavaScript became the language of the Web by default, making its popularity almost...

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JavaScript: The Good Parts
Douglas Crockford
Published by Yahoo Press
Beijing Cambridge Farnham Kln Sebastopol Tokyo Dedication For the Lads - photo 1

Beijing Cambridge Farnham Kln Sebastopol Tokyo

Dedication

For the Lads: Clement , Philbert , Seymore , Stern , and , lest we forget , C. Twildo .

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A Note Regarding Supplemental Files

Supplemental files and examples for this book can be found at http://examples.oreilly.com/9780596517748/. Please use a standard desktop web browser to access these files, as they may not be accessible from all ereader devices.

All code files or examples referenced in the book will be available online. For physical books that ship with an accompanying disc, whenever possible, weve posted all CD/DVD content. Note that while we provide as much of the media content as we are able via free download, we are sometimes limited by licensing restrictions. Please direct any questions or concerns to .

Preface

If we offend, it is with our good will That you should think, we come not to offend, But with good will. To show our simple skill, That is the true beginning of our end.

William Shakespeare, A Midsummer Nights Dream

This is a book about the JavaScript programming language. It is intended for programmers who, by happenstance or curiosity, are venturing into JavaScript for the first time. It is also intended for programmers who have been working with JavaScript at a novice level and are now ready for a more sophisticated relationship with the language. JavaScript is a surprisingly powerful language. Its unconventionality presents some challenges, but being a small language, it is easily mastered.

My goal here is to help you to learn to think in JavaScript. I will show you the components of the language and start you on the process of discovering the ways those components can be put together. This is not a reference book. It is not exhaustive about the language and its quirks. It doesnt contain everything youll ever need to know. That stuff you can easily find online. Instead, this book just contains the things that are really important.

This is not a book for beginners. Someday I hope to write a JavaScript: The First Parts book, but this is not that book. This is not a book about Ajax or web programming. The focus is exclusively on JavaScript, which is just one of the languages the web developer must master.

This is not a book for dummies. This book is small, but it is dense. There is a lot of material packed into it. Dont be discouraged if it takes multiple readings to get it. Your efforts will be rewarded.

Conventions Used in This Book

The following typographical conventions are used in this book:

Italic

Indicates new terms, URLs, filenames, and file extensions.

Constant width

Indicates computer coding in a broad sense. This includes commands, options, variables, attributes, keys, requests, functions, methods, types, classes, modules, properties, parameters, values, objects, events, event handlers, XML and XHTML tags, macros, and keywords.

Constant width bold

Indicates commands or other text that should be typed literally by the user.

Using Code Examples

This book is here to help you get your job done. In general, you may use the code in this book in your programs and documentation. You do not need to contact us for permission. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.

We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: " JavaScript: The Good Parts by Douglas Crockford. Copyright 2008 Yahoo! Inc., 978-0-596-51774-8.

If you feel your use of code examples falls outside fair use or the permission given here, feel free to contact us at .

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Acknowledgments

I want to thank the reviewers who pointed out my many egregious errors. There are few things better in life than having really smart people point out your blunders. It is even better when they do it before you go public. Thank you, Steve Souders, Bill Scott, Julien Lecomte, Stoyan Stefanov, Eric Miraglia, and Elliotte Rusty Harold.

I want to thank the people I worked with at Electric Communities and State Software who helped me discover that deep down there was goodness in this language, especially Chip Morningstar, Randy Farmer, John La, Mark Miller, Scott Shattuck, and Bill Edney.

I want to thank Yahoo! Inc. for giving me time to work on this project and for being such a great place to work, and thanks to all members of the Ajax Strike Force, past and present. I also want to thank OReilly Media, Inc., particularly Mary Treseler, Simon St.Laurent, and Sumita Mukherji for making things go so smoothly.

Special thanks to Professor Lisa Drake for all those things she does. And I want to thank the guys in ECMA TC39 who are struggling to make ECMAScript a better language.

Finally, thanks to Brendan Eich, the worlds most misunderstood programming language designer, without whom this book would not have been necessary.

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