fizz_buzz.ex

defmodule FizzBuzz do
  def run() do
    Enum.each(1..100, fn number ->
      IO.puts(fizz_buzz(number))
    end)
  end

  def fizz_buzz(n) do
    cond do
      is_divisible_by_3?(n) and is_divisible_by_5?(n) -> "FizzBuzz"
      is_divisible_by_3?(n) -> "Fizz"
      is_divisible_by_5?(n) -> "Buzz"
      true -> n
    end
  end

  def is_divisible_by_3?(n), do: rem(n, 3) == 0
  def is_divisible_by_5?(n), do: rem(n, 5) == 0
end