[cygwin98]

My concern is that those combinations can significantly reduce Rails apps' maintainability. I wonder if jQuery is that good, can it be rewritten in CoffeeScript? Such that we can settle down at CoffeeScript, which looks like a better language anyway, and get rid of the Javascript fragmentation issue all at once.

[JoelMcCracken]

You really can't write coffeescript without knowing javascript. Really, the /only/ documentation for the language is showing what the compiled javascript looks like, plus maybe handling inheritance a bit better.