fizzbuzz_patt.ex

defmodule FizzbuzzPatt do
  def run(number) when rem(number, 15) == 0 do
   "FizzBuzz"
  end
  def run(number) when rem(number, 5) == 0 do
   "Buzz"
  end
  def run(number) when rem(number, 3) == 0 do
   "Fizz"
  end
  def run(number) do
   number
  end

  def run_again(number) when rem(number, 15) == 0, do: "FizzBuzz"
  def run_again(number) when rem(number, 5) == 0, do: "Buzz"
  def run_again(number) when rem(number, 3) == 0, do: "Fizz"
  def run_again(number), do: number

  def run_rec([]), do: []
  def run_rec(number) when is_integer(number) and number > 0 do
    run_rec(Enum.to_list(0..number))
  end
  def run_rec([head|tail]) do
    output(rem(head, 3), rem(head, 5), head)
    run_rec(tail)
  end

  defp output(0,0,n), do: IO.puts "FizzBuzz, #{n}"
  defp output(0,_,n), do: IO.puts "Fizz, #{n}"
  defp output(_,0,n), do: IO.puts "Buzz, #{n}"
  defp output(_,_,n), do: IO.puts "#{n}"
end