​CoffeeScript is a programming language that transcompiles to JavaScript. It adds syntactic sugar inspired by Ruby, Python and Haskell in an effort to enhance JavaScript's brevity and readability.
Here a quick how to if CoffeeScript in general
Install CoffeScript lib
npm install -g coffee-script
For live conversion
coffee --watch --compile script.coffee
Ruby CoffeeScript gem is a bridge to the official CoffeeScript compiler.
Install CoffeeScript gem
gem install coffee-script
Convert CoffeeScript file to JavaScript
#!/usr/bin/env rubyrequire 'coffee-script'if ARGFfile = File.open("#{ARGV[0]}.js", 'a')file.write CoffeeScript.compile(ARGF.read)end
Run it
ruby coffee2js.rb exploit.coffee
Opal is a Ruby to JavaScript source-to-source compiler. It also has an implementation of the Ruby corelib.
Install Opal gem
gem install opal opal-jquery
[5]: http://js2.coffee/​