This short book is very readable and the author raises some useful tips and insights about Coffee Script. Unfortunately the ideas are often not expanded beyond a very short example of their use. As a newcomer to the language I would have appreciated more complete examples. For instance, towards the end of the book the author shows with one complex example how to use 'do->' to create private properties in a class, and then quickly moves onto another topic. The whole topic of classes is in another chapter of the book.
This book should be better organised, into short, complete subject-based chapters. Trying to find information is difficult because the information isn't structured very well and there's no index at the back.
On the whole I didn't find the book offered as good an introduction to the language as what is on the CoffeeScript.org website.
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This book is officially the smallest tech book I own! That isn't a bad thing, the book gets the point and covers all the key parts of CoffeeScript. If you are looking to learn CoffeeScript then definitely purchase this book.