(defn unapply [f & args] (f args))

unapply is a kind of a reverse of apply from Clojure.

`apply’ lets us use a collection instead of multiple arguments:

(apply + [1 2])
=> 3

unapply lets us use multiple arguments instead of a collection:

(defn counts [coll] (map count coll))
=> #'user/counts

(unapply counts "why" "not" "a" "function")
=> (3 3 1 8)