[moomin]

Sadly, I can't share any code, but here's my basic observations: First, calling a standard Java object from Clojure is extremely painless. It's a bit more complex if you're dealing with listeners, but in general terms a java object is a java object without very much getting in the way. This means that all of your favourite GUI libraries are usable without modification.

Second, as Carl pointed out, Clojure does have state, it's just tightly controlled. So tightly controlled that multi-threaded programming is much easier. There's some things that I'd like on top of what it does, but it's very powerful and useful.

Thirdly, I'm not denying that thinking functionally takes a while, but as you develop the skill, it's amazing how many things actually look pretty stateless. I've met actuaries who use F# for all of their calculations. Equally, converting game state to a 3d scene graph is a pretty stateless process (although I've yet to meet anyone who's actually getting paid to do functional game programming).

Hope that is interesting. Will be glad to share more.