Throwing darts

darts.rb

class Darts

  def self.score_throws(arr)
    sum = 0
    flag = true
    arr.each do |dart|
      if dart < 5
        sum += 10
      elsif dart <= 10
        sum += 5
      else
        flag = false
      end
    end
    sum += 100 if flag && arr.size > 0
    sum
  end
end