{"id":41334,"date":"2021-04-12T21:57:33","date_gmt":"2021-04-12T21:57:33","guid":{"rendered":"https:\/\/www.oracletutoring.ca\/blog\/?p=41334"},"modified":"2021-04-12T21:57:34","modified_gmt":"2021-04-12T21:57:34","slug":"comp-sci-lisp-how-to-check-if-a-variable-is-defined","status":"publish","type":"post","link":"https:\/\/www.oracletutoring.ca\/blog\/comp-sci-lisp-how-to-check-if-a-variable-is-defined\/","title":{"rendered":"Comp Sci: LISP: how to check if a variable is defined"},"content":{"rendered":"\n<h2>Self-tutoring about LISP: the tutor mentions how to check if a variable if defined without invoking an error.<\/h2>\n<p>\nLet&#8217;s imagine, in LISP, you want to check if x is defined.<\/p>\n<p>\n(boundp &#8216;x)\n<\/p>\n<p>\nT if it is, NIL if not:)\n<\/p>\n<p>Source:<\/p>\n<p><a href=\"http:\/\/clhs.lisp.se\/Body\/f_boundp.htm\">clhs.lisp.se<\/a><\/p>\nJack of <a href=\"https:\/\/www.oracletutoring.ca\">Oracle Tutoring by Jack and Diane,<\/a> Campbell River, BC.\n\n","protected":false},"excerpt":{"rendered":"<p>Self-tutoring about LISP: the tutor mentions how to check if a variable if defined without invoking an error. Let&#8217;s imagine, in LISP, you want to check if x is defined. (boundp &#8216;x) T if it is, NIL if not:) Source: &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"more-link\" href=\"https:\/\/www.oracletutoring.ca\/blog\/comp-sci-lisp-how-to-check-if-a-variable-is-defined\/\"> <span class=\"screen-reader-text\">Comp Sci: LISP: how to check if a variable is defined<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[105],"tags":[],"class_list":["post-41334","post","type-post","status-publish","format-standard","hentry","category-computer-science"],"_links":{"self":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts\/41334","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/comments?post=41334"}],"version-history":[{"count":1,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts\/41334\/revisions"}],"predecessor-version":[{"id":41335,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts\/41334\/revisions\/41335"}],"wp:attachment":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/media?parent=41334"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/categories?post=41334"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/tags?post=41334"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}