Replace recursive version with pattern-matching version of fizzbuzz

control/fizzbuzz.ex

@@ -19,23 +19,11 @@ defmodule FizzBuzz do
   end
 end
 
-defmodule RecursiveFizzBuzz do
-  def upto(n) when n > 0, do: _upto(1, n, [])
+defmodule ElixirFizzbuzz do
+  def upto(n) when n > 0, do: 1..n |> Enum.map(&fizzbuzz/1)
 
-  defp _upto(_current, 0, result), do: Enum.reverse result
-
-  defp _upto(current, left, result) do
-    next_answer = 
-      cond do
-        rem(current, 3) == 0 and rem(current, 5) == 0 ->
-          "Fizzbuzz!"
-        rem(current, 3) == 0 ->
-          "Fizz"
-        rem(current, 5) == 0 ->
-          "Buzz"
-        true ->
-          current
-      end
-    _upto(current+1, left-1, [next_answer | result] )
-  end
+  def fizzbuzz(n) when rem(n, 3) == 0 and rem(n, 5) == 0, do: "Fizzbuzz!"
+  def fizzbuzz(n) when rem(n, 3) == 0, do: "Fizz"
+  def fizzbuzz(n) when rem(n, 5) == 0, do: "Buzz"
+  def fizzbuzz(n) when n > 0, do: n
 end