Bowling

game.rb

class Game
  def initialize(rolls: [])
    @rolls = rolls
    @score = 0
  end

  def roll(pins)
    @rolls << pins
  end

  def score
    frame = 0
    i = 0

    while frame < 10
      if strike?(i)
        @score += @rolls[i] + @rolls[i + 1] + @rolls[i + 2]
        i += 1
      elsif spare?(i)
        @score += @rolls[i] + @rolls[i + 1] + @rolls[i + 2]
        i += 2
      else
        @score += @rolls[i] + @rolls[i + 1]
        i += 2
      end

      frame += 1
    end

    @score
  end

  def spare?(index)
    @rolls[index] + @rolls[index + 1] == 10
  end

  def strike?(index)
    @rolls[index] == 10
  end
end