kitchen-calculator

elixir/kitchen-calculator/lib/kitchen_calculator.ex

@@ -0,0 +1,23 @@
+defmodule KitchenCalculator do
+  defp milliliter(:milliliter), do: 1
+  defp milliliter(:cup), do: 240
+  defp milliliter(:fluid_ounce), do: 30
+  defp milliliter(:teaspoon), do: 5
+  defp milliliter(:tablespoon), do: 15
+
+  def get_volume(_volume_pair = {_, volume}), do: volume
+
+  def to_milliliter(_volume_pair = {from_unit, volume}),
+    do:
+      {:milliliter, milliliter(from_unit) * volume}
+
+  def from_milliliter(_volume_pair = {:milliliter, volume}, to_unit),
+    do:
+      {to_unit, volume / milliliter(to_unit)}
+
+  def convert(volume_pair, unit) do
+    volume_pair
+    |> to_milliliter
+    |> from_milliliter(unit)
+  end
+end