Coins

coins.clj

(defn count-change [money coins]
  (cond
    (= money 0) 1
    (or (< money 0) (empty? coins)) 0
    :else (+ 
            (count-change (- money (first coins)) coins)
            (count-change money (rest coins)))))

coins.js

function countChange(money, coins) {
  if (money === 0) return 1;
  else if (money < 0 || coins.length < 1) return 0;
  else countChange(money - coins[0], coins) + countChange(money, coins.slice(1));
}

coins.scala

def countChange(money: Int, coins: List[Int]): Int = {
  if (money == 0) 1
  else if (money < 0 || coins.isEmpty) 0
  else countChange(money - coins.head, coins) + countChange(money, coins.tail)
}