Ebook You Don't Know JS: Scope & Closures
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You Don't Know JS: Scope & Closures
Ebook You Don't Know JS: Scope & Closures
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From the Author
The "You Don't Know JS" book series is intended to bring us all (myself included!) to terms with the reality that there's an awful lot of JS that we think we kinda know, but we don't really have total confidence in. Rather than leaving these topics to the misunderstanding, and treating certain things as a black box we can't understand, we dive deeply into them and try to uncover exactly how and why they work.It is my hope that you will come away from these books with a much deeper confidence in, and appreciation for, JavaScript. Isn't it time we all start really knowing JS?
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About the Author
Kyle Simpson is an Open Web Evangelist from Austin, TX. He's passionate about JavaScript, HTML5, real-time/peer-to-peer communications, and web performance. Otherwise, he's probably bored by it. Kyle is an author, workshop trainer, tech speaker, and avid OSS community member.
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Product details
Paperback: 98 pages
Publisher: O'Reilly Media; 1 edition (March 24, 2014)
Language: English
ISBN-10: 9781449335588
ISBN-13: 978-1449335588
ASIN: 1449335586
Product Dimensions:
6 x 0.2 x 9 inches
Shipping Weight: 5.3 ounces (View shipping rates and policies)
Average Customer Review:
4.6 out of 5 stars
180 customer reviews
Amazon Best Sellers Rank:
#31,159 in Books (See Top 100 in Books)
This book delivers exactly what it claims to contain. Any beginner or intermediate JavaScript developer can benefit from this book. What makes this so special is Kyle Simpson does a very good job at breaking down the most fundamental concepts such as scope, blocks and I/O as well as not stopping at defining, but takes things a step further by defining how basic JavaScript operates. Even more advanced developers can find use of this lean, but mean reference book. Examples are clean and concise.At the cost, all front-end, back-end and full stack developers should have this sitting among their technical book collection. Cheaper than many e-books.My only issue (and this may be the case for me alone) lies with the print quality. Beginning with the Foreword and ending with the Appendix section, I have counted fourteen (14) pages with variable print density: left of each page suggest low-toner or my book was at the end of print batch run. Nonetheless, words are fairly visible, but I had to remove one star for this issue alone.Final verdict: Content is resourceful (grade A) which is all you can ask for in when it comes to technical reference material, however the print quality (C) needs quality check before shipping out to vendors.
Before this, You Don't Know JS, series of books, there were no books that I'm aware of entirely focused on more advanced JavaScript. This particular book focuses on scope and closures.It takes an interesting tack and talks about what's going on internally with the JavaScript engine when it encounters variables. It talks about scope bubbles, and the different types of scope in JavaScript. It also covers closures better than any other book I've read. It discussed hoisting - which has almost no coverage in other books, IIFEs, and delves into some of the new features coming in ES6.The main reason I gave this 4, instead of 5, stars is that a book like this has kind of a strange place in the education of a JavaScript developer. It's too advanced for beginning developers, yet really advanced developers probably know 99% of what's covered here. There is an intermediate developer who this book will be perfect for. That's the niche. If you are looking to kick up your skills a notch, but have some JavaScript under your belt - this series of books may be for you.
It's good. A bit long winded at times, but, as a book primarily focused on lexical scoping, it doesn't wander too much. The more I think about it, the more I would have opened with something like:Closures, as pertains to JavaScript/JS/ECMAscript/ES, is a concept founded in lexical scoping. Lexical scoping is the scope introduced as part of the authoring process, or upon interpretation of an authored script. The authored script is simply the character stream entered by the coder or IDE.Instead there's a story about JS engines or something. While I do feel that it is important to consider how a scripting system interprets and operates, that information is probably best set in an appendix with a quick touch on the topics and a referral to the back of the book (this could also improve consistency of the series.) Small, focused, information at the top with background at the back. Technical book mullet? IDK...
This is a great book for anyone that wants to start getting serious about javascript. If you're just going to copy and paste a couple jquery plugins, this might not be for you, but if you want to be a true Javascript artist, this is the entry point. This is the first book in the "You don't know Javascript" series. I would recommend not skipping this intro into the series, it lays the framework for your entire future as a Javascript artist. From variables to closures. Even if you have some experience, this edition will probably teach you a thing or two and get you ready to deep dive into serious scripting.
Great introduction to the JavaScript language, with bits of the new standard, ES6 or ES2015 included. Browser support for ES2015 is limited so I don't know how much use you're going to get out of those examples without a transpiler, but for what you get in this book, despite its thinness and the fact it is available online for free, it's totally worth the buy. This is one you need on your bookshelf for future reference.
What I have read so far is excellent instruction. This opinion from an engineer with limited but reasonable code background, enough to follow good technical information that is meant to teach a technical subject for true understanding. True understand? Many books in technical subjects are written to virtually insure only the best can stay with it or require a class (textbook) to move through the material (and get class time for questions). We called it weeding it out, in college. This series is not that, but written like the rare technical teacher who really wants people to stay interested and learn.
Not only does the author know what he's talking about, he knows how to communicate it. As a long time Java programmer, many of the aspects of JavaScript were mysterious and obtuse, or at least the way they were explained made them seem that way. Scope and Closure are two of those aspects and now they seem simple obvious artifacts of the functional nature of the JavaScript language. Now all the patterns that the other books demonstrate but don't bother to explain seem much more clear. I can look at the language with new eyes and new understanding. Highly recommended for anyone that needs an under-the-hood understanding of JavaScript and anyone that wants to side-swipe smug job interviewers that want to trip you up with manufactured mis-understandable code.
Coming from a primarily Java background, it is easy to try and fit new concepts in a language to those you are already familiar with. While trying to grasp these concepts in the true Javascript way, I've found that many other authors tend to glance over or avoid digging deeper because of the complexity in some topics. I really enjoy Kyle Simpson's series and the way he teaches the fundamentals in an informative way.
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