[haggy]

> Most of the newer popular functional languages aren't implemented in those, but rather Java

Well, that's not entirely correct. I assume you mean they run on the JVM? Language like scala are actually written IN scala. The only thing that is in java is the interpreter but the entire compiler is scala.

[Blackthorn]

True enough for Scala, but Clojure has plenty of Java code.

[phyrex]

OTOH clojure script is completely written in clojurescript