I live coded a game recently using my new obsession: Elm

If you haven’t tried Elm, you’re missing out. It’s a purely functional reactive programing language that compiles to JavaScript for front end web development. There are 4 hours of video from on livecoding.tv split into 4 parts:
Part 1a
Part 2b
Part 2
Part 3

The finished program is on GitHub. The master branch is the completed program with a computer player AI using the minimax algorithm. branches part-1 and part-2 contain the code I wrote during the livecoding sessions