Last december I decided to take part in the Advent of Code. Of course, just programming my way through the AOC wouldn't be as much fun as doing it in a shiny new language. This time I decided to give Haskell a try. I had been doing functional programming in Rust and Javascript for some time and I thought it would be a great moment to finally try the hard stuff. I was eager to use a pure functional language, so the 1st of December I downloaded the Glasgow Haskell Compiler (GHC for friends) and started my completely functional adventure.