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The Coronavirus situation has lead us to suspend public training - which was on the cards anyway, with no plans to resume

Please ask about private 'maintenance' training for Python, Tcl, Perl, PHP, Lua, etc
Happily continuing private consultancy / programming work
 
Dont just convert to Perl - re-engineer!

There's a difference between converting a program from one language to another and re-engineering a program to make best use of a new language - and I had a couple of clear examples of that on our Perl for Larger Projects course today.

The following is "converted" code ...

if (! open (FH,"../Desktop/access_log.xyz")) {
print STDERR "We have a weeny problem there!\n";
exit (1);
}


Or "re-engineered" you can write ...

open (FH,"../Desktop/access_log.xyz")
   or die "We have a weeny problem there!\n";


The following is "converted" code again ...

while ($line = <FH>) {
   if (index($line,"cliad") > -1) {
      print "$line";
   }
}


which is much better written as

@info = <FH>;
@matched = grep(/cliad/,@info);
print @matched;


or perhaps even

print (grep(/cliad/,<FH>));

Why re-engineer?
• Performance
• Maintainability
• Readability
• Extendability
(written 2007-10-18, updated 2007-10-19)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
P704 - Managing Perl Projects
  [2375] Designing your data structures for a robust Perl application - (2009-08-25)
  [2070] Converting to Perl - the sort of programs you will write - (2009-03-08)
  [836] Build on what you already have with OO - (2006-08-17)

P711 - An Introduction to Standards in Perl
  [4326] Learning to program - comments, documentation and test code - (2014-11-22)
  [3398] Perl - making best use of the flexibility, but also using good coding standards - (2011-08-19)
  [2875] A long day in Melksham ... - (2010-07-17)
  [2688] Security considerations in programming - what do we teach? - (2010-03-22)
  [1863] About dieing and exiting in Perl - (2008-11-01)
  [1853] Well structured coding in Perl - (2008-10-24)
  [1728] A short Perl example - (2008-07-30)
  [1555] Advanced Python, Perl, PHP and Tcl training courses / classes - (2008-02-25)
  [1345] Perl and Shell coding standards / costs of an IT project - (2007-09-11)
  [1221] Bathtubs and pecking birds - (2007-06-07)
  [1047] Maintainable code - some positive advice - (2007-01-21)
  [965] KISS - one action per statement please - Perl - (2006-12-05)
  [945] Code quality counts - (2006-11-26)
  [743] How to debug a Perl program - (2006-06-04)
  [668] Python - block insets help with documentation - (2006-04-04)
  [242] Satisfaction of training - (2005-03-11)


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Using PHP to upload images / Store on MySQL database - security questions
Some other Articles
Pictures Framed
Someone else's wedding
Perl - progress bar, supressing ^C and coping with huge data flows
Using PHP to upload images / Store on MySQL database - security questions
Dont just convert to Perl - re-engineer!
Business to Business Networking - North and West Wilts / Melksham
First Alternative / what has happened there?
Autumnal lighting on a London trip
Ordnance Survey Grid Reference to Latitude / Longitude
Converting from postal address to latitude / longitude
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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