Pascal case conversion in Elixir

pascal_case.ex

  @doc "Convert a string or atom to a pascal case string"
  @spec pascal_case(String.t() | atom()) :: String.t()
  def pascal_case(name)
  def pascal_case(name) when is_atom(name), do: name |> Atom.to_string() |> pascal_case()

  def pascal_case(name) when is_binary(name) do
    ~r{(\W|_)+}
    |> Regex.split(name)
    |> Enum.map(&capitalise/1)
    |> Enum.to_list()
    |> IO.iodata_to_binary()
  end

  defp capitalise(""), do: ""
  defp capitalise(<<head::utf8, tail::binary>>), do: [String.upcase(<<head::utf8>>), tail]