Challenging Clojure in Common Lisp (2014)

Re:Challenging Clojure in Common Lisp (2014) by ajss on Sunday January 08, 2017 @04:41AM (#13349055)

(defn [o n] (.write o n)) will have to look up the .write method by doing reflection on o & n at runtime, which is really slow.

(defn [^WriteInterface o ^long n] (.write o n)) can be much faster because the compiler knows the type of o & n.

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Re:Challenging Clojure in Common Lisp (2014) by abc_lisper on Sunday January 08, 2017 @01:18PM (#13351077)

I think you meant to say, (defn func[o n] (.write ^WriteInterface o ^long n))

This is needed only when calling Java methods, because Java allows overloading. Clojure only does arity-overloading, not type overloading, and hence doesn't need the type info.

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