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Discussion on: Daily Challenge #29 - Xs and Os

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thepeoplesbourgeois profile image
Josh

Now in elixir because hey all the cool kids are using not-Javascript here.

defmodule ExsAndOhs do

  def try_to_get_over_them(string) do
    string
      |> String.downcase
      |> test(0) # The `Enum` module's for chumps.
  end

  defp test("", count), do: count == 0  # whole string is traversed
  defp test("x" <> string, count), do:  # next grapheme is an "x"
    test(string, count + 1)             
  defp test("o" <> string, count), do:  # next grapheme is an "o"
    test(string, count - 1) 
  defp test(string, count), do:         # String.next_grapheme/1 is a tuple πŸ˜ƒ
    string
      |> String.next_grapheme
      |> elem(1)
      |> test(count)

end