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Perl tutorials and courses

Modern Perl Web Frameworks

  • Mojolicious light-weight web framework with rainbows and unicorns.
  • Perl Dancer light-weight web framework to rock.
  • Catalyst The MVC web framework of Perl.
  • PSGI/Plack, the low-level superglue between Perl web application frameworks and web servers.
  • CGI, the Common Gateway Interface, for old-school web applications.

Object Oriented Perl

  • OOP, the classic way to write Object Oriented Perl code.
  • Moo, the Minimalist Object Oriented system for Perl.
  • Moose, the 'post modern' Object Oriented system for Perl.

Other Series

Projects and Collections

Code-Maven series

If you are a beginner, or would like to refresh your Perl programming knowledge, you can go over the Perl tutorial or watch the Beginner Perl Maven video course.

If you need to maintain a large piece of software written in Perl by other people in the last 5-10-15 years, that's a challenge. Especially if you did not get proper training in Perl. You are probably limited to a specific and old version of Perl. Check out, the Perl tutorial! You can probably skip the part about installing Perl, but the rest of the tutorial will be relevant for you.

Perl is often used in Test Automation. If you work in this field, or if you'd like to work in this field (it is much more fun to find bugs in other people's code than in yours :), then you can read the Perl tutorial and the series on Test Automation using Perl.

If you build new web applications - either privately or inside a company - you can start by reading the article comparing CGI, mod_perl and PSGI. From there you can go on reading the generic Perl tutorial or the articles on Mojolicious, Perl Dancer, Catalyst, PSGI/Plack, or even CGI, the Common Gateway Interface, for old-school web applications.

Recent Articles

Possible precedence issue with control flow operator

Recently I've encountered some code hidden in a 1000-line long file that looked like this:

examples/return_or.pl

use strict;

sub compute {
    my ($param) = @_;

    # ...
    return $param or 'default';
}

print '1: ', compute('hello'), "\n";
print '2: ', compute(''), "\n";

I am not even sure how I noticed it, but it looked incorrect so I created the above simple example.


Possible precedence issue with control flow operator


Pro: Testing for no warnings in Perl

Just as it is important to make sure a given code that is expected to warn, indeed warns, it is also important to make sure other parts of the code don't warn.

Especially if you follow my advice and always use warnings.

There are several solution for this.


Testing for no warnings in Perl


How to get a slice of a hash?

Given a hash of some of the capitals of the world

my %capital_of = (
    Bangladesh => 'Dhaka',
    Tuvalu     => 'Funafuti',
    Zimbabwe   => 'Harare',
    Eritrea    => 'Asmara',
    Botswana   => 'Gaborone',
);

How can we get several values out of it in one step?


How to get a slice of a hash?