Mod Syntax in Clojure

clojure, modulus

Solution

There are two functions in Clojure you might want to try: `mod` and `rem`. They work the same for positive numbers, but differently for negative numbers. Here's an example from the docs:

(mod -10 3) ; => 2
(rem -10 3) ; => -1

Update:

If you really want to convert your code to Clojure, you need to realize that an idiomatic Clojure solution probably won't look anything like your JavaScript solution. Here's a nice solution that I think does roughly what you want:

(defn change [amount]
  (zipmap [:quarters :dimes :nickels :pennies]
    (reduce (fn [acc x]
              (let [amt (peek acc)]
                (conj (pop acc)
                      (quot amt x)
                      (rem amt x))))
            [amount] [25 10 5])))

(change 142)
; => {:pennies 2, :nickels 1, :dimes 1, :quarters 5}

You can look up any of the functions you don't recognize on ClojureDocs. If you just don't understand the style, then you probably need some more experience programming with higher-order functions. I think 4Clojure is a good place to start.

Problem

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