The Weekly Challenge - 227

Monday, Jul 24, 2023| Tags: Perl, Raku










09. TASK #1: Friday 13th

10. TASK #2: Roman Maths


Welcome to the Week #227 of The Weekly Challenge.

Let us all welcome two new members, Packy Anderson and Adriaan Dens to the Team PWC.

Thank you Peter Campbell Smith for the proposed tasks of Week #227.

At The Perl and Raku Conference 2023 in Toronto, I handed over the T-shirt to Saif Ahmed and Will Braswell. Those who are new, we decided to celebrate the 1000 days of weekly challenge by giving away specially designed T-shirt. For some unavoidable reasons, I couldn’t deliver the T-shirt to the eligible members. I am taking my family to India on 3 weeks break, flying on 4th Aug. I will get this sorted when I am back, promise.

The details of the celebration and eligible members are formally documented for refence.

Today, we are giving away Coupon #49 to Luca Ferrari for the book, Learning Perl Exercises by brian d foy. I will share the details with you in a separate email.


  S. No.    Name S. No.  Name
1.  Cheok-Yin Fung 2.  W. Luis Mochan
3.  Robert DiCicco 4.  Kueppo Wesley
5.  Solathian 6.  Dario Mazzeo
7.  Peter Campbell Smith   8.  Kjetil Skotheim
9.  Neils van Dijke 10.  Laurent Rosenfeld  
11.  Duncan C. White 12.  Ali Moradi
13.  Jorg Sommrey 14.  James Smith
15.  Alexander Pankoff 16.  Simon Green
17.  Robbie Hatley 18.  Bob Lied
19.  Athanasius 20.  David Ferrone
21.  Thomas Kohler 22.  Adam Russell
23.  E. Choroba 24.  Pip Stuart
25.  Roger Bell_West 26.  Flavio Poletti
27.  Dave Jacoby 28.  Mariano Spadaccini
29.  Lubos Kolouch 30.  Matthew Neleigh
31.  Paulo Custodio 32.  Tyler Bird
33.  Carlos Oliveira 34.  Avery Adams
35.  Matthias Muth 36.  Leo Manfredi
37.  Peter Meszaros 38.  Arne Sommer
39.  Jaldhar H. Vyas 40.  Mark Anderson
41.  Rob Turner 42.  BarrOff
43.  Robert Ransbottom 44.  Andreas Voegele
45.  Jan Krnavek 46.  Steven Wilson
47.  Bruce Gray 48.  PokGoPun
49. 50.

Last 5 weeks mainstream contribution stats. Thank you Team PWC for your support and encouragements.

  Week      Perl       Raku       Blog   
   222       56       30       19   
   223       44       25       16   
   224       38       21       15   
   225       56       31       24   
   226       61       32       26   

Last 5 weeks guest contribution stats. Thank you each and every guest contributors for your time and efforts.

  Week      Guests       Contributions       Languages   
   222       10       41       14   
   223       09       37       13   
   224       08       32       13   
   225       13       63       21   
   226       13       52       14   

TOP 10 Guest Languages

Do you see your favourite language in the Top 10? If not then why not contribute regularly and make it to the top.

 1. Python  (1678)
 2. Haskell (568)
 3. Ruby    (549)
 4. Lua     (491)
 5. C       (433)
 6. Rust    (399)
 7. C++     (391)
 8. BQN     (302)
 9. Go      (258)
10. Java    (238)

Blogs with Creative Title

1. Shuffled Operations by Adam Russell.

2. Zero Shuffle by Arne Sommer.

3. Shuffle Off To Buffalo by Dave Jacoby.

4. Array indexes everywhere! by Luca Ferrari.

5. Gnirsts and nothing left by Peter Campbell Smith.

6. Shuffling Zeroes by Roger Bell_West.

7. Moving and Removing by Simon Green.

GitHub Repository Stats

1. Commits: 33,399 (+116)

2. Pull Requests: 8,423 (+44)

3. Contributors: 227 (+1)

4. Fork: 289 (+3)

5. Stars: 160 (+1)

Our solo sponsor Pete Sergeant has been a great support to keep us motivated. We are lucky that he agreed to continue the journey with us in the year 2023. I would like to personally thank Pete and his entire team for their generosity. It would be great if we could add few more to sponsor the prize money so that we could go back and declare weekly champions as we have done in the past. I hope and wish this will become possible in 2023. The amount doesn’t have to be huge. However, it would be nice to show off bunch of supporters. If an organisation comes forward and supports us then that would be the ultimate achievement.


Quick recap of The Weekly Challenge - 226 by Mohammad S Anwar.


If you missed any past reviews then please check out the collection.


If you missed any past reviews then please check out the collection.


Please take a look at the charts showing interesting data.

I would like to THANK every member of the team for their valuable suggestions. Please do share your experience with us.


Packy Anderson, an experienced Perl/Raku hacker from Haledon, NJ, USA joined the Team PWC.

Adriaan Dens, an experienced Perl hacker joined the Team PWC.

Please find out How to contribute?, if you have any doubts.

Please try the excellent tool EZPWC created by respected member Saif Ahmed of Team PWC.


Please check out the guest contributions for the Week #226.

Please find past solutions by respected guests. Please share your creative solutions in other languages.

Task 1: Friday 13th

Submitted by: Peter Campbell Smith

You are given a year number in the range 1753 to 9999.

Write a script to find out how many dates in the year are Friday 13th, assume that the current Gregorian calendar applies.


Input: $year = 2023
Output: 2

Since there are only 2 Friday 13th in the given year 2023 i.e. 13th Jan and 13th Oct.

Task 2: Roman Maths

Submitted by: Peter Campbell Smith

Write a script to handle a 2-term arithmetic operation expressed in Roman numeral.


IV + V     => IX
M - I      => CMXCIX
X / II     => V
XI * VI    => LXVI
V - V      => nulla (they knew about zero but didn't have a symbol)
V / II     => non potest (they didn't do fractions)
MMM + M    => non potest (they only went up to 3999)
V - X      => non potest (they didn't do negative numbers)

Last date to submit the solution 23:59 (UK Time) Sunday 30th July 2023.


If you have any suggestions or ideas then please do share with us.

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