https://wiki.kram.nz/index.php?action=history&feed=atom&title=SE701%3AScreencasts%3Ascar107%3AOptionalParametersSE701:Screencasts:scar107:OptionalParameters - Revision history2026-04-05T22:29:17ZRevision history for this page on the wikiMediaWiki 1.45.3https://wiki.kram.nz/index.php?title=SE701:Screencasts:scar107:OptionalParameters&diff=12800&oldid=prevMark: 3 revision(s)2008-11-03T05:27:47Z<p>3 revision(s)</p>
<p><b>New page</b></p><div>Can be downloaded from [http://frio.name/streaming/se701-screencast-01.mov here]. Note - new and improved! Well, kinda. It's still not particularly exciting, but I made the resolution bigger so it's easier to see/read. Ooooh!<br />
<br />
Cheatsheet:<br />
* &optional: specifies that the following unnamed argument is optional<br />
(defun do-stuff (&optional on-something))<br />
* &key: specifies that the following argument is named<br />
(defun do-stuff (&key (thing "hello"))<br />
(print thing))<br />
<br />
(do-stuff :thing "nahhh")<br />
* &rest: specifies that a variable number of arguments should be assigned to a list in the following argument<br />
(make-list (&rest args)<br />
(for i in args do<br />
(print i)))<br />
<br />
Choice!</div>Mark