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clojurevariadic-functionsclojure-java-interop

How to handle java variable length arguments in clojure?

I'am wrapping a java lib into clojure, but i have problems dealing with variable length arguments. Say,

TestClass.aStaticFunction(Integer... intList){/*....*/}

How could i call this function in clojure?

Solution

  • Since Java varargs are actually arrays, you can call vararg functions in Clojure by passing an array.

    You could convert a Clojure seq (maybe by using Clojure's variety of variable argument functions) into an array:

     (TestClass/aStaticFunction (into-array Integer [(int 1),(int 2)]))

    or 

    (defn a-static-function-wrapper [& args]
  (TestClass/aStaticFunction (into-array Integer args))

    Or make an array and set its indices manually

    (TestClass/aStaticFunction (doto (make-array Integer 3)
                              (aset 0 first-element)
                              (aset 1 second-element)
                              (aset 2 third-element)))