{"url":"https://www.shigemk2.com/entry/20120409/1333915510","author_name":"shigemk2","author_url":"https://blog.hatena.ne.jp/shigemk2/","provider_name":"Hatena Blog","title":"and \u3068 or","version":"1.0","blog_url":"https://www.shigemk2.com/","height":"190","categories":["Emacs Lisp"],"provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.shigemk2.com%2Fentry%2F20120409%2F1333915510\" title=\"and \u3068 or - by shigemk2\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","width":"100%","image_url":"http://ecx.images-amazon.com/images/I/51Wg39T8KAL.jpg","published":"2012-04-09 05:05:10","blog_title":"by shigemk2","type":"rich","description":";; and \u8fd4\u308a\u5024\u306f\u6700\u5f8c\u306b\u8a55\u4fa1\u3057\u305f\u30d5\u30a9\u30fc\u30e0\u3067\u3001\u3044\u305a\u308c\u304b\u304c\u507d\u306a\u3089\u3070nil (and t t) ; => t (and nil t) ; => nil (and 1 2) ; => 2 (if 1 2) ; => 2 (and 1 2 3) ; => 3 ;; or \u8fd4\u308a\u5024\u306f\u6700\u5f8c\u306b\u8a55\u4fa1\u3057\u305f\u30d5\u30a9\u30fc\u30e0\u3067\u3001\u3059\u3079\u3066\u507d\u306a\u3089\u3070nil (or nil nil) ; => nil (or nil t) ; => t (or nil 1 2) ; => 1 (or nil 1 2 3) ; => 1 ;; \u30c9\u30e2\u30eb\u30ac\u30f3 ;; and not not -> not or (and (not t) (not nil))\u2026"}