https://koans.heroku.com/en/about_scoring_project, in two tries

about_scoring_project.rb

def score(dice)
  
  score = 0
  
  roll_count = dice.inject(Hash.new(0)) { |roll, count| 
    roll[count] += 1; roll
  }
  
  roll_count.each { |roll, count| 
    if count >= 3 
      if roll == 1 
        score += 1000
      else
        score += roll * 100
      end
      count -= 3
    end
    if roll == 1 
      score += count * 100
    elsif roll == 5 
      score += count * 50
    end
  }
  
  return score
  
end