How to map over sequence of Java methods to be executed

Question

The following will work:

(map #(%1 "21") [identity])

However the following code fails

(map #(%1 "21") [.toString])

How do I create a seq/collection of Java methods?

Answer 1

Java methods are not first class citizens like functions in clojure. You can't pass java methods as parameters, return or store in variables and collections. But you can create function by memfn or just anonymous function which wraps original method call

(map #(%1 21) [(memfn toString)])
=> ("21")

(map #(%1 21) [#(.toString %)])
=> ("21")