Anti-if abuse, haha!

anti_if_abuse.rb

  def frames
    Enumerator.new do |yielder|
      position = 0

      10.times do
        yielder << rolls[position,3].map(&:to_i)

        position += next_position(rolls[position])
      end
    end
  end

  def next_position(index)
    n = Hash.new(2)
    n[10] = 1
    n[index]
  end