Shaking nil from false in Clojure

Question

I want the following outcome: "1" -> true "0" -> false nil -> nil

How can this function be improved?

#(when-not (nil? %) (if %  "1" "0"))

Answer 1

Your requirement translates directly into a map and maps are also callable as functions in Clojure, so {1 true, 0 false} is the function you want.

({1 true, 0 false} 1) ;;=> true
({1 true, 0 false} 0) ;;=> false
({1 true, 0 false} nil) ;;=> nil