I've said before that CoffeeScript is not a "replacement" or "alternative' to JS since it "compiles" to javascript--but in this case you're talking about provid

I've said before that CoffeeScript is not a "replacement" or "alternative' to JS since it "compiles" to javascript--but in this case you're talking about providing source that users will have to interact with in a language in which they may not be familiar. Yes, it ultimately becomes Javascript--but what about the javascript developer who wants to learn rails? I'm sure coffeescript is a fine language in its own right--but the fact that it has to generate Javascript code rather than something lower-level is frustrating to me. I haven't dug into it enough to know; but my gut tells me that (like other examples of code attempting to "compile to another programming language") the output from the "compiler" is less than quality code. Maybe, in most cases, this is fine. In some environments though where performance is at a premium, I don't know that CS will output well optimized code.