example.clj

(defn divisible?
  "Returns true if the remainder of x / y is zero, else false."
  [x y]
  (zero? (rem x y)))

(defn fizzbuzz
  "Returns Fizz if n is divisible by 3, buzz if n is divisible by 5,
  and fizzbuzz if n is divisible by both."
  [n]
  (cond (divisible? n 15) "fizzbuzz"
        (divisible? n 3)  "fizz"
        (divisible? n 5)  "buzz"
        :else n))