I found that wrox books are quite informative, and being a web professional, these are the kind of books that you want to buy. If you are a web monkey and don't have any education of the art of programming however, you really won't grasp the concepts that are presented in this book. It's not meant to be a code source book, that you can find in the javascript reference. This is to fully understand the concepts of JavaScript.(aka livescript for those of you in the know) Again, if you are a professional, this would be a great book for you. If you are a beginning programmer however, you might be better off getting a sams teach yourself book. start with the blah blah in 10 minutes. then get the 24 hours. 21 days is a waste. When you are at that point then come to wrox and get the real book on the language.