You really should read up on the implementation of FP data structures in languages like Clojure or Haskell before making statements like this. You sound silly.

You really should read up on the implementation of FP data structures in languages like Clojure or Haskell before making statements like this. You sound silly. Clojure's immutable data structures are thread-safe, fast, and quite different than your apparent idea of what these kinds of data structures actually are.