This is Part Three of a series of articles on Java.next. In Part Three, I will explore how the Java.next languages (JRuby, Groovy, Clojure, and Scala) support dispatch. For my purposes here ...

Because Clojure data structures are immutable, they can benefit from an AtomicReference in a way that mutable classes cannot. The immutable approach looks only a little simpler in this small example.