Cool Code


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Presented at GeeCON (18th May 2012)
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In most disciplines built on skill and knowledge, from art to architecture, from creative writing to structural engineering, there is a strong emphasis on studying existing work. Exemplary pieces from past and present are examined and discussed in order to provoke thinking and learn techniques for the present and the future. Although programming is a discipline with a very large canon of existing work to draw from, the only code most programmers read is the code they maintain. They rarely look outside the code directly affecting their work. This talk examines some examples of code that are interesting because of historical significance, profound concepts, impressive technique, exemplary style or just sheer geekiness.

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Cool Code

  1. 1. Cool Code @KevlinHenney
  2. 2. There is an art, craft, and science to programming that extends far beyond the program. The act of programming marries the discrete world of computers with the fluid world of human affairs. Programmers mediate between the negotiated and uncertain truths of business and the crisp, uncompromising domain of bits and bytes and higher constructed types.
  3. 3. RUD, noun  Rapid Unscheduled Disassembly  Rocket science and amateur rocketry jargon that's acronymous, euphemistic and explosively self-explanatory WordFriday
  4. 4. cool, adjective  fashionably attractive or impressive  excellent  used to express acceptance or agreement  used as an intensive  used when a conversation goes silent  marked by deliberate effrontery or lack of due respect or discretion  restrained or relaxed in style code, noun  a system of words, figures or symbols used to represent others  a set of instructions for a computer  a computer program, or a portion thereof  a set of conventions or principles governing behaviour or activity in a particular domain  a system or collection of rules or regulations on any subject  a collection of writings Oxford English Dictionary ∙ Concise Oxford English Dictionary ∙ Merriam-Webster's Collegiate Dictionary ∙ Urban Dictionary
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  8. 8. #!/usr/bin/perl # -------------------------------------------------------- PerlInterpreter # PerlInterpreter must be the first line of the file. # # Copyright (c) 1995, Cunningham & Cunningham, Inc. # # This program has been generated by the HyperPerl # generator. The source hypertext can be found # at This program belongs # to Cunningham & Cunningham, Inc., is to be used # only by agreement with the owner, and then only # with the understanding that the owner cannot be # responsible for any behaviour of the program or # any damages that it may cause. # -------------------------------------------------------- InitialComments # InitialComments print "Content-type: text/htmlnn"; $DBM = "/usr/ward/$ScriptName"; dbmopen(%db, $DBM , 0666) || &AbortScript("can't open $DBM"); $CookedInput{browse} && &HandleBrowse; $CookedInput{edit} && &HandleEdit; $CookedInput{copy} && &HandleEdit; $CookedInput{links} && &HandleLinks; $CookedInput{search} && &HandleSearch; dbmclose (%db); if ($ENV{REQUEST_METHOD} eq POST) { $CookedInput{post} && &HandlePost; } # &DumpBinding(*CookedInput); # &DumpBinding(*old); # &DumpBinding(*ENV); # -------------------------------------------------------- WikiInHyperPerl
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  11. 11. /^1?$|^(11+?)1+$/
  12. 12. :;while [ $? -eq 0 ];do nc -vlp 8080 -c'(r=read;e=echo;$r a b c;z=$r;while [ ${#z} -gt 2 ];do $r z;done;f=`$e $b|sed 's/[^a- z0-9_.-]//gi'`;h="HTTP/1.0";o="$h 200 OKrn";c="Content";if [ -z $f ];then($e $o;ls|(while $r n;do if [ -f "$n" ]; then $e "<a href="/$n">`ls -gh $n`</a><br>";fi;done););elif [ -f $f ];then $e "$o$c-Type: `file -ib $f`n$c-Length: `stat -c%s $f`";$e;cat $f;else $e -e "$h 404 Not Foundnn404n";fi)';done
  13. 13. There have always been fairly severe size constraints on the Unix operating system and its software. Given the partially antagonistic desires for reasonable efficiency and expressive power, the size constraint has encouraged not only economy but a certain elegance of design. Dennis Ritchie and Ken Thompson "The UNIX Time-Sharing System", CACM
  14. 14. Any application that can be written in JavaScript, will eventually be written in JavaScript. Atwood's Law
  15. 15. If you don’t have time to read, you don’t have the time or the tools to write. Stephen King
  16. 16. geecon
  17. 17. geecon
  18. 18. geecoff