I have read most of this book thanks to my MEAP purchase and I have found it very informative. The book encourages the reader to think of js as a functional language, and it does a very good job of describing functional techniques available to you the newly savvy ninja.
If you're still wondering things like:
- What's a closure?
- What is the global namespace?
- What's a higher order function?
- What is dynamic typing?
I'm looking forward to receiving the final version of the book. The clarity and correctness of the prose has improved a lot since the first version I read and, of course, the quality of the ideas was always high.