Elixir

Other Elixir solutions.

defmodule Lasagna do
  def expected_minutes_in_oven, do: 40

  def remaining_minutes_in_oven(t) do
    expected_minutes_in_oven() - t
  end

  def preparation_time_in_minutes(layers) do
    2 * layers
  end

  def total_time_in_minutes(layers, minutes) do
    preparation_time_in_minutes(layers) + minutes
  end

  def alarm, do: "Ding!"
end