defmodule FizzBuzz do
  def fizzbuzz(n) when rem(n, 15) == 0, do: "FizzBuzz"
  def fizzbuzz(n) when rem(n,  5) == 0, do: "Buzz"
  def fizzbuzz(n) when rem(n,  3) == 0, do: "Fizz"
  def fizzbuzz(n),                      do: n
end

Enum.each(1..100, &IO.puts FizzBuzz.fizzbuzz &1)