Take the delta of two simple velues

delta_simple.ex

  @spec delta_simple(path(), term(), term()) :: [delta()]
  defp delta_simple(_path, a, b) when a == b, do: []

  defp delta_simple(path, a, b) do
    cond do
      empty?(a) -> [{path, {:add, b}}]
      empty?(b) -> [{path, {:delete, a}}]
      true -> [{path, {:update, a, b}}]
    end
  end