This series explores the popular CoffeeScript programming language, which is built on top of JavaScript. In Part 1, you learned about the perks for developers, set up the CoffeeScript compiler, and used it to create code that was ready to run in a browser or server. In this article, wade deeper into the CoffeeScript language. Use CoffeeScript to solve several programming problems, with a mathematical flavor to them, from Project Euler. Example source code is provided.