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Issue #749 - 2025-12-01 - Design Patterns in Modern Perl
latest | archive | edited by Gabor Szabo
This edition was made possible by the supporters of our cause.
Don't miss the next issue!
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Hi there! The big announcement is that Mohammad Sajid Anwar who runs The Weekly Challenge and who is the other editor of the Perl Weekly newsletter, has published his first book called Design Patterns in Modern Perl. You can buy it both on Amazon and on Leanpub. Leanpub gives you the option to change the price so you can also use this opportunity to give a one-time donation to him. As far as I know, Leanpub also gives a much bigger part of the price to the author than Amazon does. You can also ask them to send the book to your Kindle or you can upload it yourself. I already bought it and started to read it. Now you go, buy the book! In just a few hours we are going to have the online meeting Perl Code-reading and testing. You can still register here. Perl on WhatsApp: I am part of a lot of WhatsApp groups about Python and Rust and other non-tech stuff. I figured I could create one for Perl as well. If you are interested join here. There are also two groups on Telegram. One is called Perl 5 that has 141 members and the other one is called Perl Maven community that I created, because I did not know about the other one. The latter has 59 members. You are invited to join any or all of these channels. I started a poll in the Perl Community Facebook group. There are already 63 votes. It would be nice if you answered too. Enjoy your week! Gabor Szabo |
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Announcements
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by Mohammad Sajid Anwar (MANWAR) Manwar, congratulations! Everyone else, go buy the book! (comments) | 
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Articles
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by Dave Cross (DAVECROSS) I like the sentiment, but as one of the commenters pointed out there was PHP as well. | 
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by Mikko Koivunalho In a nutshell, if you'd like to use 'the Perl license' you probably should include two separate license files. (comments) |
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by Jacques Deguest (JDEGUEST) A small project that might interest anyone in dealing with form validation, localisation, and JSON Schema in their Perl web applications / REST API. |
Web
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by Mike Whitaker (PENFOLD) For those using the Perl Catalyst web framework in ways involving structured request bodies (e.g. API POSTs)... |
The Weekly Challenge
The Weekly Challenge by Mohammad Sajid Anwar will help you step out of your comfort-zone. You can even win prize money of $50 by participating in the weekly challenge. We pick one champion at the end of the month from among all of the contributors during the month, thanks to the sponsor Lance Wicks.
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by Mohammad Sajid Anwar (MANWAR) Welcome to a new week with a couple of fun tasks "Good Substrings" and "Shuffle Pairs". If you are new to the weekly challenge then why not join us and have fun every week. For more information, please read the FAQ. |
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by Mohammad Sajid Anwar (MANWAR) Enjoy a quick recap of last week's contributions by Team PWC dealing with the "Power String" and "Meeting Point" tasks in Perl and Raku. You will find plenty of solutions to keep you busy. |
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by Ali Moradi Both solutions use a straightforward, single-pass approach that is perfectly suited for the problem. They process the input string only once, making them very efficient (O(n)) and demonstrating a solid grasp of fundamental algorithmic thinking. |
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by Arne Sommer The post is an excellent, practical demonstration of Raku's expressiveness and built-in functionality. It successfully showcases how Raku allows a programmer to transition from a straightforward, imperative approach to a concise, idiomatic, and highly readable functional solution. |
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by Bob Lied The post presents a fascinating and honest case study of over-engineering. Bob deliberately explores a complex, "enterprise-grade" solution to a simple problem, contrasting it with the obvious simple solution. |
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by Jorg Sommrey This is an exceptionally well-crafted post. It demonstrates a deep understanding of Raku's idioms and standard library, transforming simple problems into masterclasses in concise, expressive, and functional programming. |
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by Luca Ferrari This is an exemplary post that demonstrates exceptional technical breadth, deep practical knowledge, and a clear, effective pedagogical style. It transcends being a mere solution set and serves as a masterclass in polyglot programming and database extensibility. |
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by W Luis Mochan The post demonstrates both deep Perl knowledge and strong pedagogical skills, making complex solutions accessible while showcasing advanced language features. |
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by Matthias Muth This post demonstrates expert-level Perl programming with deep language knowledge and thoughtful engineering considerations. Matthias combines elegant solutions with practical performance analysis. |
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by Packy Anderson (PACKY) This is a high-quality technical post that successfully demonstrates how to solve the same problems in multiple programming languages while maintaining algorithmic consistency. |
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by Peter Campbell Smith This post demonstrates creative problem-solving with elegant regex decrementing for Task 1 and a clever eval-based dispatch system for Task 2. Peter shows strong analytical thinking by carefully distinguishing between final-position and intermediate-position checks, and makes practical engineering trade-offs between cleverness and performance. |
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by Robbie Hatley This is a well-structured, professional-grade solution with excellent documentation and robust code organization. Robbie demonstrates strong analytical thinking by carefully addressing potential ambiguities in the problem statement and explicitly warning against common algorithmic pitfalls. |
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by Roger Bell West (FIREDRAKE) Roger demonstrates strong analytical skills by questioning the problem statement itself and providing robust solutions for different interpretations, showing both practical implementation skills and deeper algorithmic thinking. |
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by Simon Green This is a clean, practical, and well-explained approach to the weekly challenges. Simon demonstrates strong fundamentals with a clear, step-by-step problem-solving methodology. |
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