Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. CoffeeScript is a programming language that compiles statement-by-statement to JavaScript. The language adds syntactic sugar inspired by Ruby and Python to enhance JavaScript's brevity and readability, as well as adding more sophisticated features like array comprehension and pattern matching.On December 13, 2009, Jeremy Ashkenas made the first git commit of CoffeeScript with the comment: "Initial commit of the mystery language." The compiler was written in Ruby. On February 21, he committed version 0.5, which replaced the Ruby compiler with one written in pure CoffeeScript. By that time the project had attracted several other contributors on Github, and was receiving over 300 page hits per day.

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