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JavaScript: The Definitive Guide: Master the World's Most-Used Programming Language 7th Edition
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JavaScript is the programming language of the web and is used by more software developers today than any other programming language. For nearly 25 years this best seller has been the go-to guide for JavaScript programmers. The seventh edition is fully updated to cover the 2020 version of JavaScript, and new chapters cover classes, modules, iterators, generators, Promises, async/await, and metaprogramming. You’ll find illuminating and engaging example code throughout.
This book is for programmers who want to learn JavaScript and for web developers who want to take their understanding and mastery to the next level. It begins by explaining the JavaScript language itself, in detail, from the bottom up. It then builds on that foundation to cover the web platform and Node.js.
Topics include:
- Types, values, variables, expressions, operators, statements, objects, and arrays
- Functions, classes, modules, iterators, generators, Promises, and async/await
- JavaScript’s standard library: data structures, regular expressions, JSON, i18n, etc.
- The web platform: documents, components, graphics, networking, storage, and threads
- Node.js: buffers, files, streams, threads, child processes, web clients, and web servers
- Tools and language extensions that professional JavaScript developers rely on.
- ISBN-101491952024
- ISBN-13978-1491952023
- Edition7th
- PublisherO'Reilly Media
- Publication date
2020
June 23
- Language
EN
English
- Dimensions
6.9 x 1.5 x 8.9
inches
- Length
704
Pages
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Any JavaScript value that is not a number, a string, a boolean, a symbol, null, or undefined is an object.Highlighted by 398 Kindle readers
The special JavaScript values null and undefined are primitive values, but they are not numbers, strings, or booleans.Highlighted by 288 Kindle readers
JavaScript’s object types are mutable and its primitive types are immutable.Highlighted by 134 Kindle readers
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O'Reilly's mission is to change the world by sharing the knowledge of innovators. For over 40 years, we've inspired companies and individuals to do new things (and do them better) by providing the skills and understanding that are necessary for success.
Our customers are hungry to build the innovations that propel the world forward. And we help them do just that.
From the Publisher
About This Book
JavaScript is the programming language of the web. The overwhelming majority of websites use JavaScript, and all modern web browsers—on desktops, tablets, and phones—include JavaScript interpreters, making JavaScript the most-deployed programming language in history. Over the last decade, Node.js has enabled JavaScript programming outside of web browsers, and the dramatic success of Node means that JavaScript is now also the most-used programming language among software developers. Whether you’re starting from scratch or are already using JavaScript professionally, this book will help you master the language.
If you are already familiar with other programming languages, it may help you to know that JavaScript is a high-level, dynamic, interpreted programming language that is well-suited to object-oriented and functional programming styles. JavaScript’s variables are untyped. Its syntax is loosely based on Java, but the languages are otherwise unrelated.
JavaScript derives its first-class functions from Scheme and its prototype-based inheritance from the little-known language Self. But you do not need to know any of those languages, or be familiar with those terms, to use this book and learn JavaScript.
This book covers the JavaScript language and the JavaScript APIs implemented by web browsers and by Node. I wrote it for readers with some prior programming experience who want to learn JavaScript and also for programmers who already use JavaScript but want to take their understanding to a new level and really master the language. My goal with this book is to document the JavaScript language comprehensively and definitively and to provide an in-depth introduction to the most important client-side and server-side APIs available to JavaScript programs. As a result, this is a long and detailed book. My hope, however, is that it will reward careful study and that the time you spend reading it will be easily recouped in the form of higher programming productivity.
Editorial Reviews
About the Author
David Flanagan is a computer programmer who spends most of his time writing about JavaScript and Java. His books with O'Reilly include Java in a Nutshell, Java Examples in a Nutshell, Java Foundation Classes in a Nutshell, JavaScript: The Definitive Guide, and JavaScript Pocket Reference. David has a degree in computer science and engineering from the Massachusetts Institute of Technology. He lives with his wife and children in the U.S. Pacific Northwest bewteen the cities of Seattle, Washington and Vancouver, British Columbia.
Product details
- Publisher : O'Reilly Media; 7th edition (June 23, 2020)
- Language : English
- Paperback : 704 pages
- ISBN-10 : 1491952024
- ISBN-13 : 978-1491952023
- Item Weight : 2.65 pounds
- Dimensions : 6.93 x 1.5 x 8.9 inches
- Best Sellers Rank: #70,815 in Books (See Top 100 in Books)
- #3 in JavaScript Programming (Books)
- #9 in Web Services
- #14 in Object-Oriented Design
- Customer Reviews:
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About the author

David Flanagan is a computer programmer who has spent much of the last 20 years writing books about programming languages. He now works at Mozilla. David lives with his wife and children in the Pacific Northwest, between the cities of Seattle and Vancouver.
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First, if you have any edition prior to the 6th edition the answer is a definitive, "Yes!" There is no question that so much has changed since 2006 which is when the 5th edition was published. JavaScript feels like a whole new language since then (not really, but significant changes in the last 14 years have happened).
But, what if you have the 6th edition? What did David Flanagan change? Overall, the 7th edition comes in at 40% smaller than the 6th edition. Do you keep both? Nope. The 7th edition is much better thought through and eliminates much of the old and adds in important new things.
Seven chapters on "client-side" JavaScript are condensed into one "JavaScript in Web Browsers" chapter. The topics within that chapter are a much tighter presentation of the material you need to know. If you really need to know more about JavaScript and CSS or JQuery, go look to references on these topics. Flanagan was right to trim that fat from this book.
In the 6th edition, there were barely 20 pages focused on server-side JavaScript. Now there is a good chapter dedicated to "Server-Side JavaScript with Node". Finally, he has added a whole new chapter on tools and extensions. In other words, Flanagan has caught up with how JavaScript is really used.
The remaining changes are around the fundamentals. He has added information on symbols and has greatly reworked chapters on object and classes as one would expect. Modules have been split out into their own chapter. And, he has added a good "summary" section to each chapter.
Overall, I think the book has been "refactored" in a good way. It is much tighter. And, certainly more relevant to modern JavaScript programming. Of course, JavaScript will continue to evolve so I expect future editions will continue. But, this edition feels like a checkpoint one should mark. I have done so and my 6th edition is being duly donated.
Being a busy programmer I appreciate the fact that each paragraph is loaded with useful information so I don't have to skip over useless conversational, waste of time text.
The book can certainly be read from cover to cover. It's writing style is engaging enough. However, the immaculate organization and presentation of the chapters makes this book really shine as a reference. This is the book I go to when I need to look something up. It even replaces my previous favorite Nicholas C. Zakas excellent 'Understanding Ecmascript 6'.
I also love the short and easy to understand code samples. Again being a busy programmer I loathe having to waste time trying to decipher a weighty chunk of example code just to learn a simple feature. There's nothing wrong with toy code examples if they get the point across.
David Flanagan leaves nothing out and reaches right up to the ES2020 standard. It truly is a definitive guide to Javascript. If you buy only one Javascript book I highly recommend you get this one!
Top reviews from other countries
Muchas gracias.
Reviewed in India on July 8, 2023
If you are one of those who has some level of experience with JS and wants to level-up, this is THE book you needed yesterday.
However, please note that this is a black & white book. The colored syntax on the original international version is in greyscale here. Although it doesn't in anyway make this book less useful.
Reviewed in India on January 4, 2023
If you are one of those who has some level of experience with JS and wants to level-up, this is THE book you needed yesterday.
However, please note that this is a black & white book. The colored syntax on the original international version is in greyscale here. Although it doesn't in anyway make this book less useful.


















