You can't learn to build killer modern Web applications in Backbone.js and CoffeeScript by reading alone. It is crucial to experience the living, working code. To experiment, tweak, break, and succeed. To discover the character of the framework and language at the same time that you master the high-level concepts and structure.

This online book provides the methodical, in-depth coverage you expect from a traditional programming text, but was conceived from its inception to be an interactive experience. Backbone, Underscore, Mocha, and other libraries are live in the text. The code examples are available for download, but they are also editable and runnable right in the page. You will be prompted and encouraged into active learning.

I believe the environment I've built will help you learn Backbone.js faster and more conveniently than you would from a traditional programming book. If I'm wrong, you can keep access to the book, and have your money back.