simple module that helps divy up cards

BlackjackAssist.exs

defmodule BlackjackAssist do
  @suits ~w(hearts clubs spades diamonds)
  @values ~w(A 2 3 4 5 6 7 8 9 10 J Q K)

  def draw_card do
    {Enum.random(@suits), Enum.random(@values)}
  end

  def draw_card({:reshuffle}) do
    draw_card
  end

  def draw_card(cards) when is_tuple(cards) do
    case draw_card do
      card when cards == card ->
        draw_card(cards)
      card ->
        [card | [cards]]
    end
  end

  def draw_card(cards) when is_list(cards) and length(cards) == 52 do
    {:reshuffle}
  end

  def draw_card(cards) when is_list(cards) do
    card = draw_card

    if Enum.member?(cards, card) do 
      draw_card(cards)
    else
      [card | cards]
    end
  end
end