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たとえば、次のような文字列があるとします。
duration = "2.days"
「2.days」以内にこの 2 に 3 を掛けて、「6.days」を取得するにはどうすればよいですか
(duration.split('.').first.to_i * 3).to_s + '.days'
duration = "2.days" duration[0] = (duration[0].to_i * 3).to_s p duration # => "6.days"