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You Don't Know JS: Async & Performance
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No matter how much experience you have with JavaScript, odds are you don’t fully understand the language. As part of the "You Don’t Know JS" series, this concise yet in-depth guide focuses on new asynchronous features and performance techniques—including Promises, generators, and Web Workers—that let you create sophisticated single-page web applications and escape callback hell in the process.Like other books in this series, You Don’t Know JS: Async & Performance dives into trickier parts of the language that many JavaScript programmers simply avoid. Armed with this knowledge, you can become a true JavaScript master.With this book you will:Explore old and new JavaScript methods for handling asynchronous programmingUnderstand how callbacks let third parties control your program’s executionAddress the "inversion of control" issue with JavaScript PromisesUse generators to express async flow in a sequential, synchronous-looking fashionTackle program-level performance with Web Workers, SIMD, and asm.jsLearn valuable resources and techniques for benchmarking and tuning your expressions and statements
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Product details
Series: You Don't Know JS
Paperback: 296 pages
Publisher: O'Reilly Media; 1 edition (March 9, 2015)
Language: English
ISBN-10: 9781491904220
ISBN-13: 978-1491904220
ASIN: 1491904224
Product Dimensions:
6 x 0.7 x 9 inches
Shipping Weight: 14.4 ounces (View shipping rates and policies)
Average Customer Review:
4.6 out of 5 stars
26 customer reviews
Amazon Best Sellers Rank:
#87,402 in Books (See Top 100 in Books)
I am in probably Simpson's target group for this series. I'm a dev who mostly builds out the Service/API layer and needs to do some JavaScript on a semi-regular basis. I'm expanding that API experience into Node JS and diving more into front end frameworks. Being acutely aware of the nature of the platforms, I knew I'd need to be well versed in async to get any sort of performance out of it.The discussion of Promises made the book worth the read for me. Before I had a "good enough" idea of what was happening with Promises to use them, but there was still a little fog out there for me. After reading this book, I'm far more comfortable with using Promises, to the point they feel natural to me. Between that chapter and the first two chapters, I'd give the book 4 1/2 or 5 stars. Regardless of my thoughts on the rest of the book, those first chapters were well worth recommending the book. The only caveat I'd put on it is he throws around "inversion of control" pretty casually and almost always in a negative sense. Someone not that familiar with IoC would readily walk away from this book with the idea that it's *always* an anti-pattern to use IoC.However, the next three chapters (there's only six with several being fairly long) are a bit less impressive. There are too many distractions with *possible* enhancements for future JS frameworks and way too little on the current state of ES6. That's convinced me to avoid his "E6 and Beyond" title in hard copy although I'll probably skim the online version.The chapter on generators is over long and spends too much time showing how they can become confusing rather than spending the time focusing on good practice. This really could have been more succinct.The last two chapters are spent on performance and benchmarking but outside of WAY TOO MUCH ranting about not wasting your time on miniscule optimizations, everything was pretty shallow. It was more like a small collection of blog posts than a deep dive into the topics. What actual advice there was seemed to mostly be "just use these frameworks I suggest" than a deep dive.There's two appendices, the first discussing his own framework to build on async operations and another one with a few more patterns for async. Like most appendices, they're ok, but not the meat of the book.
This penultimate edition of the You Don't Know JS series explores everything async: Promises and Generators, mainly. As usual, the content was deep and the examples challenging (in this edition especially so). This book is certainly not for the feint of heart; if you're not an advanced developer and you don't know about these topics, you might consider reading some simpler introductory material online before tackling this.The one negative was the editing; there were many places where a sharp editor could have really clarified and simplified matters. There were a number of places where I'd read a section two or three times, and basically say to myself, "so Kyle's saying X Y Z," and then three paragraphs later see him say almost verbatim, "X Y Z." On the one hand it's always nice seeing that you correctly interpreted something difficult, but on the other a more straightforward presentation would have helped. And many other areas would have similarly benefited from a tightening up of the language, and stating more clearly and up front what the lessons to follow were.But to be clear, the above criticism should not for a moment prevent a senior JS developer from tackling this book. It'll be well worth your time, and you'll no doubt learn a tremendous amount.
This book offers a solid deep dive into various asynchronous and performance issues in javascript - especially when js is deploy in a node.js runtime able to launch operations vastly more complex than javascript executed in a Web browser.The author occassionaly delves into his own subjunctive proposals for the future of JavaScript. Those passages are no doubt well informed and mayne useful to the JS development community. For a reader trying to better understand JS as it is now, those passages might compete for attention and memory best budgeted to understanding tools in the drawer at this time. Overall, side tracks exploring potential devlopment paths not yet included in JacaScript does not at all diminish the authors skilled explanation of how JavaScript works.Particularly intersting to me was an acknowledgement that tried and true methods.... callbacks in particular.. remain part of many workflows until developers make deliberate efforts to learn and practice new approaches such as promises. The book's compare-and-contrast approach to callbacks, promises and generators can help a devloper decide when to push through doing ot the same old way and when to deploy new tools.
This is a great series, but I honestly loved this one the most. Creating a realizable set of abstractions for concurrency that ends with what is today redux sagas is a great introduction to fairly new world of concurrency programming JavaScript is approaching.
Kyle outdoes himself again with this approachable and comprehensive look at challenges and best practices when dealing with asynchronous code in JavaScript. This topic is often treated as if it's inherently complex and hard to grasp, but Kyle proves that this is not the case.
Excellent review of async programming in Javascript with a lot of focus on Promises and Generators. Both are important concepts that are only going to get more relevant.
While these books are available on GitHub for free, I prefer the analog version. This series is a must read for any serious Frontend Engineer.
I took the front end Masters course "rethinking async JavaScript"and also have this book. This book is a good reference and the content is very similar, depends on your learning style, I prefer videos.
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