How to be Popular in High School

An interesting article „How to be Popular in High School“ from TSB – The Seduction Bible.

Me envisioning closures in Scheme

Closure (computer science): an abstraction binding a function to its scope.

Keywords: scope, binding of name to location or value, enclosed variable, mutating existing bindings

(define (factory1a) (let ((myBound 5)) (lambda (x) (set! myBound (+ myBound x)) myBound) ))
(define (factory1b) ((lambda (myBound) (lambda (x) (set! myBound (+ myBound x)) myBound) ) 5) )
(define closure1a (factory1a))
(define closure1b (factory1b))
(define closure2 (factory1a))
(print „comp.lang.functional: Closures are a big deal in a non-pure functional language, because mutable closed-over lexical variables can model an encapsulated mutable state. That’s how Scheme has started.“)
(newline)
(closure1a 0) ; => 5
(closure1b 0) ; => 5
(closure2 0) ; => 5
(closure1a 1) ; => 6
(closure1b 1) ; => 6
(closure2 18) ; => 23
(closure1a 2) ; => 8
(closure1b 2) ; => 8
(closure2 19) ; => 42

(define (factory2) (let ((myBound 0)) (lambda (x) (/ x myBound)) )) ; if evaluated it will always result in a division-by-zero error
(define closuresAreFirstOfAllLazyAndSetBangDoesNotMatter (factory2))
(print „closure is executed“)
(newline)

(closure1a 0) ; => still 8 („myBound“ of factory2 is not the same as of factory1 and its derived closures)
(closure2 0) ; => still 42
(closuresAreFirstOfAllLazyAndSetBangDoesNotMatter 23) ; => division-by-zero error

How to Think Before Speaking

Ein weiser Artikel zum Thema „How to Think Before Speaking„.

Apache Konfiguration: ssl, webdav, htaccess, Subversion

SSL-Schutz eines Verzeichnisses: http://wiki.ubuntuusers.de/Apache/modssl

WebDAV:

1. http://wiki.archlinux.org/index.php/WebDAV_authentication
2. http://wiki.ubuntuusers.de/Apache/webdav

Authentication (htaccess, PAM, mod_authnz_external, etc.):

1. http://de.wikipedia.org/wiki/Htaccess
2. http://de.selfhtml.org/servercgi/server/htaccess.htm
3. http://blog.innerewut.de/2007/6/26/apache-2-2-authentication-with-mod_authnz_external

Subversion

1. http://svnbook.red-bean.com/en/1.1/ch06s04.html
2. http://wiki.archlinux.org/index.php/Subversion_Setup
3. http://lifehacker.com/software/subversion/hack-attack-how-to-set-up-a-personal-home-subversion-server-188582.php
4. http://www.debuntu.org/2006/05/20/54-how-to-subversion-svn-with-apache2-and-dav

Home Server

1. http://lifehacker.com/software/feature/how-to-set-up-a-personal-home-web-server-124212.php
2. http://lifehacker.com/software/home-server/how-to-set-up-a-home-ftp-server-130806.php
3. http://lifehacker.com/software/feature/special-how-to-host-a-personal-wiki-on-your-home-computer-126052.php

Klassische Beispiele der Softwarezuverlässigkeit

„Warum explodierten Mariner 1, Ariane 5, … oder: Was kümmern mich die Probleme der Datenverarbeitung?“

Subversion (SVN) unter Windows per Apache und WebDAV einrichten

http://lifehacker.com/software/subversion/hack-attack-how-to-set-up-a-personal-home-subversion-server-188582.php

Synching Outlook, Google Calendar, Gmail

http://internetducttape.com/2006/08/11/the-holy-grail-of-synchronization-how-to-synchronize-microsoft-outlook-multiple-locations-google-calendar-gmail-ipod-and-mobile-phone-with-funambol-scheduleworld/

for free: WiKis

Web 2.0 WiKis:
http://www.wikidot.com/

for free: Web 2.0 Office Applications

Database for Web 2.0 Office Applications:
http://www.o20db.com/

for free: Meetings Scheduler

Web 2.0 Scheduler for arranging meetings:
http://www.diarised.com/

for free: Time Tracker

Web 2.0 Time Tracker:
http://www.tiktrac.com/

Kleine wget Kommandos zum runterladen von Uni-Skripten

# Webpage
wget -e robots=off -N -nd –http-user=<ID> –http-passwd=<PW> -E -k -p <URL>

# Directly linked content files:
wget -e robots=off -N -nd –http-user=<ID> –http-passwd=<PW> -E -r –level=1 -k -A pdf pps -R htm html -np <URL>

# Directly linked mp3s (e.g. the free Top 100 from http://wiki.piratenpartei.de/index.php?title=Piraten_TOP100 )
wget -e robots=off -N -nd -E -r –level=1 -k -A mp3 ogg -R htm
html -H http://wiki.piratenpartei.de/index.php?title=Piraten_TOP100

Contra: Webpage does not locally reference the content files

Alternative:
leechget.net: „File“ » „WebParser“