I wouldn't say "beating" so much as "playing", since the challenge is to compare the length of the programs that accomplish the task. Your compojure solution a

I wouldn't say "beating" so much as "playing", since the challenge is to compare the length of the programs that accomplish the task. Your compojure solution accomplishes this at the request level, passing data between request handlers using session variables. The current arc solution has only one request handler for the entry point, and then uses temporary anonymous handlers to chain the session. This is something which could probably easily be added to compojure, since clojure has language features similar to arc.