It's interesting, the results here are way different than the Code Golf & Coding Challenges Stack Exchange. I would never expect Haskell to be that low. But after looking at code.golf, I realize it's because I/O on CG&CC is more relaxed. Most Haskell submissions are functions which return the solution.
Sidenote: I like the CG&CC method, it's semi-competitive, semi-cooperative.
- all languages welcome
- almost all users post "Try it Online"/"Attempt This Online" links
- most users post explanations under their submissions
- often people will post solutions beginning with "port of user1234's excellent Foolang answer" when there's a clever shortcut someone finds
- or people will post their own solution with "here's a solution which doesn't use user1234's algorithm"
- or people will add comments to answers with minor improvements
IMO It's geared towards what is the best part about code golf: teaching people about algorithm design and language design.