配列要素の合計を求める書き方
悪い
score = [10 , 20 , 30 , 40 ] sum = 0 score.each do | v | sum += v end p sum
普通
score = [10 , 20 , 30 , 40 ] p score.inject{ | sum , v | sum + v }
score = [10 , 20 , 30 , 40 ] sum = 0 score.each do | v | sum += v end p sum
score = [10 , 20 , 30 , 40 ] p score.inject{ | sum , v | sum + v }