I just finished this book. It helped me so much.
As a senior java developer, I need a book to break my bottleneck.And this is the one.

After finishing this book, I got a totally rethink about JDK API.

I have known where the API comes from and how elegant it is.

I am reading this book and about to finish it in 2 days.
It is too simple for me. I think it is for developer who has no javascript at all.
And it is old. In Javascript world, ExtJS,dojo,GWT ,there a lot popular frameworks.
They distributed a lot into js world to make it more OO. But this book hardly mention them.

This book is as expected. It is expecialy good for newbies like me.
After finished the first chapter, I began to use it in my current project.

The only little issue is: it is not for advanced users.