Add case-based fizzbuzz

control/fizzbuzz.ex

@@ -29,3 +29,20 @@ defmodule ElixirFizzbuzz do
   def _fizzword(n, _, 0), do: "Buzz"
   def _fizzword(n, _, _) when n > 0, do: n
 end
+
+defmodule CaseFizzbuzz do
+  def upto(n) when n > 0 do
+    1..n
+    |> Enum.map(&fizzbuzz/1)
+  end
+
+  def fizzbuzz(n) do
+    current = {n, rem(n, 3), rem(n, 5)}
+    case current do
+      {n, 0, 0} -> "Fizzbuzz"
+      {n, 0, _} -> "Fizz"
+      {n, _, 0} -> "Buzz"
+      {n, _, _} -> n
+    end
+  end
+end