I would learn Clojure. More and more major companies are picking it up and it seems to be a workhorse which you can use for a long time. It's mature, has advanc

I would learn Clojure. More and more major companies are picking it up and it seems to be a workhorse which you can use for a long time. It's mature, has advanced techniques for concurrency and is extremely flexible. It's made to stay.