These are exercises and code examples from "The Joy of Clojure" by Fogus and Houser written in Atomy (http://atomy-lang.org). Atomy is still a work in progress but I find it to be one of the most interesting languages around. There is also a Ruby library that implements various persistent data structures call Hamster (https://github.com/harukizaemon/hamster/)
brixen/joy-of-atomy
Joy of Clojure examples and exercises written in Atomy (http://atomy-lang.org)
MIT