If you recall he wrote another great resource a year or so ago called jQuery Enlightenment.
Who is the Target Audience of this Book?
What does the book Cover?
What to Expect in the book?
It is Cody's style to have lots of code examples in his book. The great thing about this is that he provides a jsFiddle link to the code so that you can pull it up in your browser and play around with it until the concept sinks in. I really enjoyed this in his last book (jQuery Enlightenment) and I'm also loving it in this book.
Cody even goes to explain that the words in the book describing the code should be secondary to the code itself. The examples are there to help you understand what is going on, which is great!
High Level Overview of Contents?
Cody's book has 15 main chapters and each of them are broken up into much smaller pieces, but to spare you the who table of contents I've just listed out the top level chapters for you to look over below...
Chapter 02 - Working with Objects and Properties
Chapter 03 - Object()
Chapter 04 - Function()
Chapter 05 - The Head/Global Object
Chapter 06 - The this Keyword
Chapter 07 - Scope & Closures
Chapter 08 - Prototype Property
Chapter 09 - Array()
Chapter 10 - String()
Chapter 11 - Number()
Chapter 12 - Boolean
Chapter 13 - Null
Chapter 14 - Undefined
Chapter 15 - Math Function
You can actually preview all of Chapter 6 - The this Keyword on the Nettuts website if you are curious as to what some of the content looks like in the book.
Should I Get this Book?
There is a lot of great material in this book. Most of book is coding examples which means that you can get through it fairly quickly. The book is able to fit in a ton of information in less than 150 pages! I highly recommend this book. There is a lot of value jam packed in this book for a price tag of $15.