remote-control-car

elixir/remote-control-car/lib/remote_control_car.ex

@@ -0,0 +1,27 @@
+defmodule RemoteControlCar do
+  @enforce_keys [:nickname]
+  defstruct [:nickname, battery_percentage: 100, distance_driven_in_meters: 0]
+
+  def new(nickname \\ "none"), do: %__MODULE__{nickname: nickname}
+
+  def display_distance(%__MODULE__{distance_driven_in_meters: distance_driven_in_meters} = _remote_car) do
+    "#{distance_driven_in_meters} meters"
+  end
+
+  def display_battery(%__MODULE__{battery_percentage: 0} = _remote_car) do
+    "Battery empty"
+  end
+
+  def display_battery(%__MODULE__{battery_percentage: battery_percentage} = _remote_car) do
+    "Battery at #{battery_percentage}%"
+  end
+
+  def drive(%__MODULE__{battery_percentage: 0} = remote_car), do: remote_car
+  def drive(%__MODULE__{} = remote_car) do
+    %{
+      remote_car |
+      battery_percentage: remote_car.battery_percentage - 1,
+      distance_driven_in_meters: remote_car.distance_driven_in_meters + 20,
+    }
+  end
+end