I wrote one in Haskell (https://news.ycombinator.com/item?id=22523088 https://news.ycombinator.com/item?id=22523088), but I think it might be understandable for

I wrote one in Haskell (https://news.ycombinator.com/item?id=22523088 https://news.ycombinator.com/item?id=22523088), but I think it might be understandable for others, since I don't use many Haskell-isms other than do-notation and typeclasses.