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I can't be sure, but my guess is that adhering to this book's practices has saved me many hours of frustration.
I also like the explanations: how and why the good parts work. But this is where I begin to have reservations about the book. Some of the explanations are incomprehensible because of poor editing. How is it possible that a collection of technology pace-setters (Crockford, O'Reilly, Amazon) can leave numerous "confirmed serious technical mistakes" in their work uncorrected for at least 4 years (I bought it in 2012)?
O'Reilly's errata website for this book lists 157 'confirmed' errata, of which 9 are classified as "Serious Technical Mistake." There are also 22 "unconfirmed errata." Most of the confirmed errata were marked as fixed shortly after publication, but at least one of them ("beget") is still in the Kindle edition. O'Reilly helpfully provides downloadable copies of the example code online, but the current version still contains errors that prevent the code from running (mode/node).
I keep going back and re-reading this book, so looking past all my wasted time trying to make sense of the errors, I would give a correctly edited edition of this book five stars for the educational insights sprinkled through it. Or maybe not any more. The state of the art has changed. For example, as many one-star reviewers point out, the whole section on Object.create is outdated. This book needs a rewrite.
This book is NOT for beginners to programming.
This book is very opinionated on what the core language constructs are and how to use them and avoid the other parts.
Also, you can find Crockford on youtube quite easily. I went through his excellent series here: https://www.youtube.com/watch?v=JxAXlJEmNMg&list=PL7664379246A246CB
Update: Note: I have purchased 3 O'Reilly books in the last couple of months. Each one of them has literally fallen apart. I will be reading a page and the page will come out of the binding. I am fairly gentle on the books so I think there is a binding problem at O'Reilly.
Top international reviews
This book was written in 2008 and probably needs updating. It’s hard going in places and the diagrams did little to nothing to help my understanding. I’ve come away still wondering about new and constructors, but I know I just need to review them again when I need them and it’ll get clearer. I’m still not sure which function declaration syntax is best, but I’m not sure it matters too much.
These 3 books hold, the dubious honour, of being the only 3 programming books I have actually read cover to cover.
This book, is great, as I initally skim read this book over a lazy saturday afternoon, while drinking beer while sitting in sun lounger. Not something I often associate with tech books! I also watched some of the Douglas Crockfords videos on YouTube, which are great addendums, and a must.
Douglas Crockfords style and approach to this book is just right! Easy to follow, and for a tech book a real page turner.
And it is, but it's jam-packed with Good Stuff.
If you're somebody who's picked up JS as you went along and learned to hate it as you went, this is the book that will show you a beautiful, powerful, and remarkably flexible language with no shortcomings that can't be worked around.
Very worth while reading, even if you only do a small amount of JS.