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Re: How to write long programms?

by japhy (Canon)
on Mar 07, 2001 at 11:39 UTC ( #62688=note: print w/ replies, xml ) Need Help??


in reply to How to write long programms?

Writing code you don't understand two days later is a bad thing. Perhaps you need to comment the code more.

The goal in this case, though, is to learn how to modularize your code effectively. Most CGI programs I write use a dispatch table:

my $thing = $cgi->param('action'); my %actions = ( login => [ \&login ], main => [ \&view_page, 'front' ], index => [ \&view_page, 'index' ], unknown => [ sub { die "unknown action '$thing'" } ], ); my ($func,@args) = @{ $actions{$thing} or $actions{unknown} }; $func->(@args);
Basically, I set up a hash of function references (and their arguments). Then I call the function corresponding to the action.

Most of my code is broken down into functions in the case of main functionality and repeated functionality -- in other words, the main actions (logging in, viewing a page, searching) are in functions, and common tasks (reading a config file, saving data) are in functions as well.

japhy -- Perl and Regex Hacker


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