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 23:37:05)

 P704 - Managing Perl Projects
P711 - An Introduction to Standards in Perl

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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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