Basic "while" loop in elixir

Password.exs

defmodule Password do
  @doc """
    Consider a basic password loop
    it exists with a positive result if the user chooses the right password
    It exists with a negative result if theuser is wrong three times
    How would you code this loop
  """
  def guess(attempts \\ 0)
  def guess(attempts) when attempts < 3 do
       guess = IO.gets "Guess: "
       if guess == "si\n" do
        {:ok, "You've got it"}
       else
        IO.puts("Try again")
        guess(attempts+1)
       end
  end
  def guess(3) do
    {:nope, "Max attempts reached"}
  end
end