An interactive problem website for Clojure beginners (github.com)

Same here, test one was very straight-forward, but then I looked at the second one and thought it simply wanted me to enter the number 4-- after reading around it looks like it wanted a function instead? Then I realized it didn't want the entire block of code, just the part for what was in the space. It wasn't obvious what was required of me.

I thought the repo is more interesting for hackers. I watched it besides solving some problems.