Instruct: Classify Amazon reviews into positive or negative sentiment
Query: In general, this book was quite helpful.

I wouldn't recommend reading this book if you have never looked into Javascript before, but if you have a general understanding of the web, HTML, and rudimentary Javascript, it can be very insightful.There are some bugs in the examples, but quite frankly, I have yet to come across a Javascript book that didn't. What I like about the book is that it has real-life examples that you actually could use in your web pages.