Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not enough example. Not worth for your money!

This book has not enough example. It will give you some idea about JavaScript but you won't gain much out of it. I suggest the O'Reilly book, JavaScript: The Definitive Guide. That book is much better than this one. If you really want to learn JavaScript,don't buy this book. But,if you want to know what JavaScript is,this one should do it.