Next: List Elements, Previous: Lists as Boxes, Up: Lists [Contents][Index]
°Ê²¼¤Î½Ò¸ì¤Ï¡¢Lisp¥ª¥Ö¥¸¥§¥¯¥È¤¬¡¢¥¢¥È¥à¤Ç¤¢¤ë¤«¡¢
¥³¥ó¥¹¥»¥ë¡¢¤Ä¤Þ¤ê¡¢¥ê¥¹¥È¤Ç¤¢¤ë¤«¡¢
ÆÃÊ̤ʥª¥Ö¥¸¥§¥¯¥Ènil
¤Ç¤¢¤ë¤«Ä´¤Ù¤Þ¤¹¡£
¡Ê¤³¤ì¤é¤Î¿¤¯½Ò¸ì¤Ï¡¢¤½¤ì¤¾¤ì»Ä¤ê¤Î½Ò¸ì¤ÇÄêµÁ²Äǽ¤Ç¤¢¤ë¡£
¤·¤«¤·¡¢Â¿ÍѤ¹¤ë¤¿¤á¡¢¤³¤ì¤é¤¹¤Ù¤Æ¤òÍѰդ·¤Æ¤ª¤¯²ÁÃͤ¬¤¢¤ë¡£¡Ë
¤³¤Î´Ø¿ô¤Ï¡¢object¤¬¥³¥ó¥¹¥»¥ë¤Ê¤é¤Ðt
¤òÊÖ¤·¡¢
¤µ¤â¤Ê¤±¤ì¤Ðnil
¤òÊÖ¤¹¡£
nil
¤Ï¥³¥ó¥¹¥»¥ë¤Ç¤Ï¤Ê¤¤¤¬¡¢¶õ¥ê¥¹¥È¤Ç¤¢¤ë¡£
¤³¤Î´Ø¿ô¤Ï¡¢object¤¬¥¢¥È¥à¤Ê¤é¤Ðt
¤òÊÖ¤·¡¢
¤µ¤â¤Ê¤±¤ì¤Ðnil
¤òÊÖ¤¹¡£
¥³¥ó¥¹¥»¥ë¤ò½ü¤¯¤¹¤Ù¤Æ¤Î¥ª¥Ö¥¸¥§¥¯¥È¤Ï¥¢¥È¥à¤Ç¤¢¤ë¡£
¥·¥ó¥Ü¥ënil
¤Ï¥¢¥È¥à¤Ç¤â¤¢¤ê¥ê¥¹¥È¤Ç¤â¤¢¤ë¡£
¤³¤Î¤è¤¦¤ÊLisp¥ª¥Ö¥¸¥§¥¯¥È¤Ïnil
¤À¤±¤Ç¤¢¤ë¡£
(atom object) ≡ (not (consp object))
¤³¤Î´Ø¿ô¤Ï¡¢object¤¬¥³¥ó¥¹¥»¥ë¤«nil
¤Ê¤é¤Ðt
¤òÊÖ¤¹¡£
¤µ¤â¤Ê¤±¤ì¤Ðnil
¤òÊÖ¤¹¡£
(listp '(1)) ⇒ t
(listp '()) ⇒ t
¤³¤Î´Ø¿ô¤Ï¡¢listp
¤ÎÈ¿ÂФǤ¢¤ë¡£
object¤¬¥ê¥¹¥È¤Ç¤Ê¤±¤ì¤Ðt
¤òÊÖ¤¹¡£
¤µ¤â¤Ê¤±¤ì¤Ðnil
¤òÊÖ¤¹¡£
(listp object) ≡ (not (nlistp object))
¤³¤Î´Ø¿ô¤Ï¡¢object¤¬nil
¤Ê¤é¤Ðt
¤òÊÖ¤·¡¢
¤µ¤â¤Ê¤±¤ì¤Ðnil
¤òÊÖ¤¹¡£
¤³¤Î´Ø¿ô¤Ï¡¢not
¤ÈƱ°ì¤Ç¤¢¤ë¤¬¡¢°Õ¿Þ¤òÌÀ³Î¤Ë¤¹¤ë¤¿¤á¤Ë¡¢
object¤ò¥ê¥¹¥È¤È¹Í¤¨¤ë¤È¤¤Ë¤Ïnull
¤ò»È¤¤¡¢
object¤ò¿¿ÍýÃͤȹͤ¨¤ë¤È¤¤Ë¤Ïnot
¤ò»È¤¦
¡ÊCombining Conditions¤Înot
¤ò»²¾È¡Ë
(null '(1)) ⇒ nil
(null '()) ⇒ t