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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

Pro: How to replace a column in a CSV file using Perl

Given a CSV file, how can we replace the values in one of the columns?

For example given this file:

examples/test_cases.csv

170,test,best,one,0.1314
171,test,best,two,0.1695
172,test,best,two,0.1784
173,test,best,three,0.3748

how can we replace the 4th column to contain the value 'CIS' in every line?


How to replace a column in a CSV file using Perl



Refactoring Perl code

Refactoring is the task of changing code to make it more readable, more maintainable, while not changing it's behavior at all.

The simplest example I usually give is that of changing a variable name to be meaningful.

We all know that naming things is really hard so when we write code and we read in some data we can easily start using meaningless variables. For example $x, $data, or $temp. We might finish our implementation, the code starts doing what we expected it to do, but we still have these meaningless variables.

When a few days or month later we need to come back to make changes we'll be baffled by the meaning of these variables.

It is better to change them to something meaningful to make it easier to read and understand the code.

The process of these changes is called refactoring. In this series of articles we are going to see how to do that.


Refactoring Perl code