Didn't know about ABCL :) You have defprotocol to dispatch based on types in clojure. There's deftype to dynamically create classes and Java has reflection to

Didn't know about ABCL :) You have defprotocol to dispatch based on types in clojure. There's deftype to dynamically create classes and Java has reflection to begin with. You can call .getClass at runtime (which is what the type function does).