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Warning: Cannot modify header information - headers already sent by (output started at /home/didierve/didierverna.net/blog/inc/libs/clearbricks/common/lib.json.php:309) in /home/didierve/didierverna.net/blog/inc/libs/clearbricks/common/lib.http.php on line 295 Didier Verna's Scientific Blog - Tag - design patternDidier Verna's scientific blog: Lisp, Emacs, LaTeX and random stuff.2024-01-31T17:45:28+00:00Didier Vernaurn:md5:a22c53786aff986a2da4c770c233a8f9DotclearNew article in JUCS journalurn:md5:ee805720a86395f78ce1af70385cc51aWednesday, April 14 2010Wednesday, April 14 2010Didier VernaLispdesign patternjournalJUCSpublicationvisitor My article entitled "Revisiting the Visitor: the Just Do It Pattern" has just been published in the JUCS journal, Volume 16, Issue 2.<br /><br />You can find it <a href="http://www.jucs.org/jucs_16_2/revisiting_the_visitor_the" target="_blank">here</a>.https://www.didierverna.net/blog/index.php?post/2010/04/14/New-article-in-JUCS-journal#comment-formhttps://www.didierverna.net/blog/index.php?feed/navlang:en/atom/comments/2190' session at the next ACCU Conferenceurn:md5:4f1f3117bfee3a5e01322ac9426580ddTuesday, January 13 2009Tuesday, January 13 2009Didier VernaLispACCUconferencedesign patternpublicationvisitor I will hold a 90 minutes session at the next <a href="http://www.accu.org" target="_blank">ACCU</a> conference, in the special track on patterns. Here is a description of my talk:<br /><br /><strong><center>Revisiting the Visitor: the "Just Do It" pattern.</center></strong><br /><br />A software design pattern is a three-part rule which expresses a relation between a certain context, a problem, and a solution. The well-known "GoF Book" describes 23 software design patterns. Its influence in the software engineering community has been dramatic. However, Peter Norvig notes that "16 of [these] 23 patterns are either invisible or simpler [...]" in Dylan or Lisp (Design Patterns in Dynamic Programming, Object World, 1996).<br /><br />We claim that this is not a consequence of the notion of "pattern" itself, but rather of the way patterns are generally described; the GoF book being typical in this matter. Whereas patterns are supposed to be general and abstract, the GoF book is actually very much oriented towards mainstream object languages such as C++. As a result, most of its 23 "design patterns" are actually closer to "programming patterns", or "idioms", if you choose to adopt the terminology of the POSA Book.<br /><br />In this talk, we would like to envision software design patterns from the point of view of dynamic languages and specifically from the angle of CLOS, the Common Lisp Object System. Taking the Visitor pattern as an illustration, we will show how a generally useful pattern can be blurred into the language, sometimes to the point of complete disappearance.<br /><br />The lesson to be learned is that software design patterns should be used with care, and in particular, will never replace an in-depth knowledge of your preferred language (in our case, the mastering of first-class and generic functions, lexical closures and meta-object protocol). By using patterns blindly, your risk missing the obvious and most of the time simpler solution: the "Just Do It" pattern.<br />https://www.didierverna.net/blog/index.php?post/2009/01/13/90-session-at-the-next-ACCU-Conference#comment-formhttps://www.didierverna.net/blog/index.php?feed/navlang:en/atom/comments/43