Ruby ã® CSV ã©ã¤ãã©ãªã¯ã¨ã¦ã便å©ãªãã ãã©ãã²ã¨ã¤ã ãåé¡ããã£ã¦ãCSV ããã¼ã¹ããã¨ãã« nil ãè¿ããã¨ãããã ã¤ãã®ãã㪠CSV ããã¼ã¹ããã¨2çªç®ã®ã«ã©ã ã nil ã«ãªãã4çªç®ã®ã«ã©ã ã¯ç©ºæåã«ãªãã®ã«ï¼ hoge,,fuga,"",piyo require 'csv' CSV.parse_line('hoge,,fuga,"",piyo') #=> ["hoge", nil, "fuga", "", "piyo"] ãªã®ã§ CSV ã®ãã¼ã¹çµæã¯å ¨é¨æååã ã¨æã£ã¦ä½¿ã£ã¦ãã¨ã¨ã©ã¼ã«ãªã£ã¦ã³ã£ããããã CSV.parse_line('hoge,,fuga').map(&:upcase) #=> undefined method 'upcase' for nil (NoMethodError) CSV ãçæããã¨ãã nil ã¨ç©ºæåã§å¤ãã: pu


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