Hopeless
I found this book one of the worst teach yourself titles I have ever come across. It really doesn't come across that author has any practical grasp of the subject. There is a sad lack of practical examples until the final chapters, which make it very difficult to learn as you go. The examples given contain errors. The pathetic humour is irritating in the extreme (particularly on second and third readings). I learnt so little from this book, and became so confused, that I began to doubt my ability to understand Javascript at all despite a programming background. Fortunately I came across Nick Heinle's book on the same subject and so got to understand that Javascript really isn't that difficult after all. So if you've read this book and decided Javascript is beyond you, think again.