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CoffeeScript

Vert.x supports JavaScript through the Rhino JavaScript engine. Although JavaScript is a decent language once you get to know it, I prefer CoffeeScript, a language that compiles to JavaScript. Luckily, vert.x has built-in support for CoffeeScript, so I can use it nearly transparently. You will only notice the JavaScript under the hood when reading stack traces, which will refer to the compiled JavaScript file.