Has anyone used Coffeescript for a production application? [closed]

Answer 1

Almost a year later, it's worth posting some updates:

1. Ruby on Rails 3.1 is incorporating official CoffeeScript support, which means it's going to see far more real-world use. I gave a talk at RailsConf last month, where most of the attendees hadn't heard of CoffeeScript before and—given dhh's strong endorsement—were eager to get into it.
2. There's a book on CoffeeScript, currently in eBook and soon to be in print from The Pragmatic Bookshelf. It's called CoffeeScript: Accelerated JavaScript Development, and it's by yours truly. It's based on CoffeeScript 1.1.1.
3. The language has actually changed very little in the six months between 1.0 and 1.1.1; nearly all of the changes qualify as "bugfixes." I had to make very few tweaks to the code in the book for the transition from 1.0.1 to 1.1.1. However, I'm sure the language will see more significant changes in the future.

The most definitive list of CoffeeScript projects is on the CoffeeScript wiki's In the Wild page.

I'd say that most of the production use of CoffeeScript so far is in conjunction with Appcelerator to create iPhone/Android apps. (Wynn Netherland of The Changelog blurbed my book by describing CoffeeScript as "my secret weapon for iOS, Android, and WebOS mobile development"), but there's going to be a lot more use in production Rails apps—and, I hope, elsewhere—in the coming months.