Simple example of using a Clojure macro to dispatch to functions by passing in a string of the function name.

gistfile1.clj

(defn plus [& n] (apply + n))
(defn minus [& n] (apply - n))
(defn mult [& n] (apply * n))

(defmacro do-math
  [math & nums]
  `(~(read-string math) ~@nums))

(do-math "plus" 1 2 3 4)
;=> 10

(do-math "minus" 1 2 3 4)
;=> -8

(do-math "mult" 1 2 3 4)
;=> 24