This book is not terribly useful if you've already read any other Javascript books. It's got a ridiculous number of incredibly basic "recipes" like "Changing String Case" or "Testing Numeric Equality". This is pure filler.

I was hoping it would be filled with examples of how to do medium complexity tasks, with the idea being that you could combine them into some sophisticated effects. There are some of these sorts of things, but even once it gets away from focusing on core objects like strings and arrays, you still get things like "Changing a Form's Action" and "Disabling Form Controls". These are the kinds of things that are completely obvious one- or two- liners once you've read a book on the JS language and the client-side DOM/API.