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CoffeeScript, 2nd Edition by Trevor Burnham

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The New Kid in Town

On Christmas Day 2009, Jeremy Ashkenas first released CoffeeScript, a little language he touted as “JavaScript’s less ostentatious kid brother.” The project quickly attracted hundreds of followers on GitHub as Ashkenas and other contributors added a bevy of improvements each month. The language’s compiler, originally written in Ruby, was replaced in March 2010 by one written in CoffeeScript.

After its 1.0 release on Christmas 2010, CoffeeScript became one of GitHub’s “most watched” projects. And the language attracted another flurry of attention in April 2011, when David Heinemeier Hansson confirmed rumors that CoffeeScript support would be included in Ruby on Rails 3.1.

Why did this little language catch on so quickly? Three ...

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