Ruby Shuffle

gistfile1.rb

  # Shuffles all the unused cards in the shoe. Uses the
  # Fisher-Yates shuffling algorithm.
  # Returns nil.
  def shuffle!
    (@contents.size-1).downto(2) { |n|
      m = rand(n+1)
      @contents[n], @contents[m] = @contents[m], @contents[n]
    }
    nil
  end