Straight forward solution to scoring a blowing game

bowling_scores.rb

rolls = Array.new(21, 5)
p rolls
frame = 0
scores = []

while (f = rolls.shift) # first roll
  frame += 1
  if f == 10 # strike!
    scores << f + rolls[0].to_i + rolls[1].to_i
  else
    s = rolls.shift # second roll

    total = f + s
    if total == 10 # spare
      total += rolls[0].to_i
    end
    scores << total
  end

  if frame == 10 # last frame
    break
  end
end

p scores