Ruby CoffeeScript is a bridge to the JS CoffeeScript compiler.
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ExecJS lets you run JavaScript code from Ruby. It automatically picks the best runtime available to evaluate your JavaScript program, then returns the result to you as a Ruby object.
Ruby standard for wrapping ruby libraries
The Ruby standard for publishing and managing third party libraries provided by RubyGems.
CoffeeScript is a little language that compiles into JavaScript. Underneath all of those embarrassing braces and semicolons, JavaScript has always had a gorgeous object model at its heart. CoffeeScript is an attempt to expose the good parts of JavaScript in a simple way.