ã¯ããã« JavaScriptã®åå¿è ã«ã¨ã£ã¦undefinedã¨ããã®ã¯ã¡ãã£ã¨æ··ä¹±ãæããã®ããããnullã¨ã®éãã使ãåããããåãããªãã£ãããæ°å¤ããã¼ã«å¤ã¨ã®æ¯è¼ãä¸èªç¶ã ã£ããããã®ãåå ã¨æããããããã§ã¯ããã®ãããªundefinedã®ããããã«ã¤ãã¦ã¾ã¨ãã¦ã¿ãã ECMA262è¦æ ¼ã§ã¯ undefinedã¨nullã«é¢ãã¦ãECMA262è¦æ ¼ã§ã¯æåã«ä»¥ä¸ã®ãããªè¨è¿°ãããã 4.3.9 undefined value primitive value used when a variable has not been assigned a value. 4.3.11 null value primitive value that represents the intentional absence of any object value. undefinedã¯å¤æ°ã«


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