fizzbuzz.ex

defmodule Fizzbuzz do
  def of(num) do
    cond do
      rem(num, 15) == 0 -> "FizzBuzz"
      rem(num, 5)  == 0 -> "Buzz"
      rem(num, 3)  == 0 -> "Fizz"
      true              -> num
    end
  end
end

Enum.map((1..100), fn(x) -> IO.puts Fizzbuzz.of(x) end)