Advent of Code is a annual tradition for many programmers. Each day a new programming challenge is unlocked and our task is to solve it. They're Christmas themed, and a great test of your skills, or... if you're sadistic like me, your skills and programming language. Not every challenge willl be in Fan, but many will. They serve as great example for the language at the time of writing, though I do not guarentee that every script will work by the time you get to it. At the time of writing, Fan is a early-alpha project bound to change.
Still, if you're interested in how I'd solve my A.O.C. problems, feel free to explore.