Functional/OO Deck of Cards in Ruby - Start of a series of articles for rubylove.io

card_deck.rb

Rank = Struct.new(:rank, :value) do
  def to_s; rank; end
end

Card = Struct.new(:rank, :suit) do
  def to_s; "#{rank} of #{suit}"; end
end

class Deck
  SUITS = %w(hearts clubs spades diamonds)
  RANKS = %w(ace two three four five six seven 
             eight nine ten jack queen king)

  attr_reader :cards

  def initialize(shoe_size=1)
    @cards = build_deck*shoe_size
  end

private

  def build_deck
    all_ranks.flat_map {|rank| SUITS.flat_map {|suit| Card.new(rank,suit) } }
  end

  def all_ranks
    RANKS.map.with_index {|rank, value| Rank.new(rank, value) }
  end

end