I'm not experienced in game developing nor am I in functional programming, but there seem to be a few things out there. What samrat said and this one (in Haskell): http://joyridelabs.de/
Actual author of the article here. Was really excited to see my own blog post on Hacker News, because I didn't even submit it here.
I appreciate any kind of feedback, not only for the code or the explanations but also for my blog in general, style, etc. I'm rather new to blogging. Also, feel free to ask me anything.