Main entry point for difference engine

delta.ex

  @spec delta(any(), any()) :: delta_spec()
  def delta(a, b) do
    []
    |> delta(a, b)
    |> List.flatten()
    |> Enum.map(fn {path, element} -> {Enum.reverse(path), element} end)
    |> Enum.sort_by(fn {path, _} -> {length(path), path} end)
  end