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define_methodでDRYなコードを書いた

同じような処理をするmethodが複数ある

class Weekday
   def sunday
     puts "今日はsundayです"
   end
   def monday
     puts "今日はmondayです"
   end
   def tuesday
     puts "今日はtuesdayです"
   end
   def wednesday
     puts "今日はwednesdayです"
   end
   def thursday
     puts "今日はthursdayです"
   end
   def friday
     puts "今日はfridayです"
   end
   def saturday
     puts "今日はsaturdayです"
   end
end

define_methodで幸せになれた

class Weekday
  %i(sunday monday tuesday wednesday thursday friday saturday).each do |day|
    define_method(day) do 
      puts "今日は#{day}です"
    end
  end
end

感想

  • めっちゃ DRYで良い
  • メタプログラミングすごい
  • (少なくとも僕の)editorでハイライトされないからmethodの記述であると気づきにくい
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