Using interop constructor in map function(Clojure)

Question

I am getting this complaint when passing Integer constructor to map function :

=> (map Integer. [\"1\" \"2\" \"3\"])
CompilerException java.lang.ClassNotF         


        

Answer 1

without java interop. if you just need to convert to digits.

; nrepl.el 0.2.0 (Clojure 1.5.1, nREPL 0.2.3)
user> (map read-string ["1" "2"])
(1 2)
user> (class (first *1))
java.lang.Long

Or if you really need Integer class

user> (map (comp int read-string) ["1" "2"])
(1 2)
user> (class (first *1))
java.lang.Integer

Answer 2

map takes in a function and interop uses a special forms like new . and .. It is fairly easy to wrap these with anonymous function literals

for example

(map #(Integer. %) ["1" "2" "3"])

produces the desired result.