You could say CoffeeScript goes hand in hand with Ruby on Rails development. Here is a quick and nice syntax intro to CoffeeScript.
RubySource | CoffeeScript: A New Way of Looking at ThingsRubySource:
CoffeeScript allows human programmers to write code in an easily understandable form. The compiler then translates the code into JavaScript. The code is compiled and then run as a JavaScript application.</p>