"It is better to have 100 functions operate on one data structure than 10 functions on 10 data structures." —Alan Perlis

Note that I have no idea what a Rune is. But, you should check out Clojure's api. Here's a cheatsheet: http://clojure.org/cheatsheet

See also: http://stackoverflow.com/questions/6016271/why-is-it-better-...

BTW, I'd bet it takes longer to write a sort function than it does to search through api documentation and find one.