bowling_scores.rb

frames = [
  [10],
  [2,2],
  [10],
  [10],
  [0,2],
  [5,5],
  [5,5],
  [0,0],
  [0,0],
  [0,0]
]

def bonus(frames)
  # let {frame: frames.first,
  #      strike: -> frame {frame[0] == 10},
  #      spare: -> frame {frame.reduce(:+) == 10 && frame.first != 10},
  #      next_two_rolls: -> {frames.drop(1).flatten.take(2).reduce(:+)},
  #      next_roll: -> {frames.drop(1).flatten.take(1).reduce(:+)}} do
  # 
  #   case frame
  #   when strike
  #     next_two_rolls[]
  #   when spare
  #     next_roll[]
  #   else
  #     0
  #   end
  #     
  # end
      
  frame          = frames.first
  strike         = -> frame {frame[0] == 10}
  spare          = -> frame {frame.reduce(:+) == 10 && frame.first != 10}
  next_two_rolls = -> {frames.drop(1).flatten.take(2).reduce(:+)}
  next_roll      = -> {frames.drop(1).flatten.take(1).reduce(:+)}
  
  case frame
  when strike
    next_two_rolls[]
  when spare
    next_roll[]
  else
    0
  end
end

def base_score(frame)
  frame.reduce(:+)
end

def scores(frames)
  frames.first(10).map.with_index do |frame, index|
    base_score(frame) + bonus(frames.drop(index).take(3))
  end
end

puts frames.inspect
puts scores(frames).inspect
puts scores(frames).reduce(:+)