You'll quickly get the coolest functions if you do the problems on 4clojure.com. Checking solutions of the best users after my own was enlightening. The typical

You'll quickly get the coolest functions if you do the problems on 4clojure.com. Checking solutions of the best users after my own was enlightening. The typical compression ratio is a 7 lines nested monster with loops to a one line snippet :) By the way, after 4clojure 'apply' would be within my top 10. It might not look like much (man, I can call my fns directly!) but the fact it can prepend individual arguments to the sequence makes it a very useful tool: (apply mapv vector m) transposes m (assuming vector of vectors). Cool, huh? My own transpose would not be that terse :)