Clojure has a good collection library with immutable/persistent data structures, but as a language it allows side effects and has some mechanisms to manage them

Clojure has a good collection library with immutable/persistent data structures, but as a language it allows side effects and has some mechanisms to manage them. It is also possible to call any Java method from Clojure. Clojure does not work with Java ASTs, it translates into JVM bytecode directly.