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I spent quite a lot of time trying to work out what this error message meant:

Error: Unterminated '#if/#ifdef/#ifndef' in Libpng.xs, line 1328

The first problem here is that line 1328 is the end of the file, so that wasn't a big help.

After spending a lot of time counting #if and #endif statements in the file over and over again, in the end I had the bright idea of looking at the actual XS output, and managed to find the problem. Apologies for quoting it in full here but I can't think of a good way to truncate it:

These are some answers to the Week 142 of the Perl Weekly Challenge organized by Mohammad S. Anwar.

Spoiler Alert: This weekly challenge deadline is due in a few days from now (on December 12, 2021 at 24:00). This blog post offers some solutions to this challenge, please don’t read on if you intend to complete the challenge on your own.

Task 1: Divisor Last Digit

You are given positive integers, $m and $n.

Write a script to find total count of divisors of $m having last digit $n.

Example 1:

Input: $m = 24, $n = 2
Output: 2

The divisors of 24 are 1, 2, 3, 4, 6, 8 and 12.
There are only 2 divisors having last digit 2 are 2 and 12.

Example 2:

The Perl core team seems to be looking for resources to help in language development.

Currently, it seems the material in python.

perlgov: the perl governance document

I feel that Perl and Python cultures are quite different.

It's also based on an improvised document in 2019 when the Python reader quit.

I can understand how envious we are when we see Python attracting users(although
I'm watching a lot of cheating at the same time).

On the other hand Perl has long been a conservative culture.

So, we can refer to the methods used by developers of languages, operating systems and tools that also have a conservative mindset.

The first thing I would like us to refer to is the method used by the group that creates C language specifications.

C language specification creating group

C89, C99, C11

Development of C language has continued some slowly, but functions that users think are lacking have been added.

Specially C99 is added good features I wanted.

It would be worthwhile to ask the C specification group how it was achieved.

I think it's less repulsive and less likely to fail if we adopt a method from a culture similar to Perl rather than a culture opposite to Perl.

Welcome last month of the year 2020

Generally, I always look forward to festive month, December. But I don't expect it to be any different from other months, unfortunately.

With so much going on in my personal life, it is hard to focus on anything. One thing that I really miss these days are personal time. I am constantly working on it with the help of experts in the field. I try to look at the positive side of the life but I can't ignore the fact I am not giving 100% to my pet project The Weekly Challenge. Having said that I must thank the entire team for the support and encouragement in this difficult time. As of today, we entered into the 89th week. I can't wait to see when we get to the 100th week.

These are some answers to the Week 141 of the Perl Weekly Challenge organized by Mohammad S. Anwar.

Spoiler Alert: This weekly challenge deadline is due in a few days from now (on December 5, 2021 at 24:00). This blog post offers some solutions to this challenge, please don’t read on if you intend to complete the challenge on your own.

Task 1: Number Divisors

Write a script to find lowest 10 positive integers having exactly 8 divisors.

Example:

24 is the first such number having exactly 8 divisors.
1, 2, 3, 4, 6, 8, 12 and 24.

This is quite straight forward. We can look at consecutive integers, count their factors, and stop when we reach ten integers having 8 divisors.

Number Divisors in Raku

If you want to challenge yourself on programming, especially on Perl and/or Raku, go to https://perlweeklychallenge.org, code the latest challenges, submit codes on-time (by GitHub or email).

This blogpost is not in shortage of unanswered questions...

Task 1 Array of Product

Despite the holiday week here in the U.S., I was able to tackle this week's Perl Weekly Challenge. I have to say that this week's challenge was the most satisfying for me as it allowed me to not only come up with a novel solution (for me!), but it also provided an opportunity for me to leverage two areas of Perl programming that have been a real challenge for me: recursion and references. The deadline to submit solutions for this challenge is fast approaching so if you haven't solved it yourself yet, you may want to come back to this post later.

Task 1

Task #1, "Array of Product", asks the following:

You are given an array of positive integers @N.

Write a script to return an array @M where $M[i] is the product of all elements of @N except the index $N[i].

Example 1:

The other day I wanted to send my friend some silly emojis on LINE and so I updated my flaky old Unicode browser to the new-fangled Unicode with values above 0x10000, so that I could fetch the Emojis, which start around here. The thing also features a perl script which fetches values from Unicode::UCD using the charinfo function. I also updated to Perl 5.32 around the same time. Now the funny thing was that I started getting all kinds of errors about invalid JSON in the browser console. My Perl script was sending something of the form {... "script":Common ...} from my module JSON::Create, which is not valid JSON due to not having quotes around Common, and obviously my module was faulty.

These are some answers to the Week 140 of the Perl Weekly Challenge organized by Mohammad S. Anwar.

Task 1: Add Binary

This task was covered in the following blog post: https://blogs.perl.org/users/laurent_r/2021/11/perl-weekly-challenge-140-add-binary.html.

Task 2: Multiplication Table

You are given 3 positive integers, $i, $j and $k.

Write a script to print the $kth element in the sorted multiplication table of $i and $j.

Example 1:

If you want to challenge yourself on programming, especially on Perl and/or Raku, go to https://perlweeklychallenge.org, code the latest challenges, submit codes on-time (by GitHub or email).

Task 1 Longest Consecutive Sequence

Does anybody know Rob Seegel (aka RCS), the author/maintainer of Tk::MListbox?

I tried to contact the author by e-mail but didn't get any feedback so far.
I would like to adopt the module Tk::MListbox (and the other packages).

For a long time (since 2012), REST::Neo4p has provided a way for Perlers to play, and even work, with the graph database Neo4j.

Neo4j has made many changes and improvements in its server and its query language in that time. However, as it has become successful commercially, it has made breaking API changes of one kind or another more and more regularly. In the last major release, version 4.0, Neo4j retired the REST endpoint on which REST::Neo4p was based. This endpoint was "entity-based", as it were, allowing direct access to nodes, relationships, and the like via entity IDs. It was well suited to the object (HAR HAR) of REST::Neo4p. But Neo4j decided to focus exclusively on its declarative query language Cypher, and to move away from the "graph walking" paradigm that the REST endpoint represented.

These are some answers to the Week 140 of the Perl Weekly Challenge organized by Mohammad S. Anwar.

Spoiler Alert: This weekly challenge deadline is due in a few days from now (on November 28, 2021 at 24:00). This blog post offers some solutions to this challenge, please don’t read on if you intend to complete the challenge on your own.

Task 1: Add Binary

You are given two decimal-coded binary numbers, $a and $b.

Write a script to simulate the addition of the given binary numbers.

The script should simulate something like $a + $b. (operator overloading)

Example 1:

Input: $a = 11; $b = 1;
Output: 100

Example 2:

Input: $a = 101; $b = 1;
Output: 110

Example 3:

(Originally published on samirparikh.com.)

I founded a company called Perl Research Institute, Ltd in Japan.

The main purpose of the Perl Research Institute is to restore Perl's honor.

Its reputation was miserable compared to the excellence of Perl's features.

Perl and its users have suffered in many negative campaigns.

Perl was seen by the people who say We are loved in the whole world as an abandoned stone.

I'm not afraid to talk about Perl Even if I'm surrounded by mighty powers who Do a lot of cheating.

Perl Research Institute

These are some answers to the Week 139 of the Perl Weekly Challenge organized by Mohammad S. Anwar.

Spoiler Alert: This weekly challenge deadline is due in a few days from now (on November 21, 2021 at 24:00). This blog post offers some solutions to this challenge, please don’t read on if you intend to complete the challenge on your own.

Task 1: JostSort

You are given a list of numbers.

Write a script to implement JortSort. It should return true/false depending if the given list of numbers are already sorted.

Example 1:

Input: @n = (1,2,3,4,5)
Output: 1

Since the array is sorted, it prints 1.

Example 2:

In version 0.27 of JSON::Create I added a new indentation feature. This was added basically out of necessity. Originally the purpose of the module was sending short bits of JSON over the internet, but I've been using JSON more and more for processing data too. I've spent quite a long time working on a web site for recognition of Chinese, and I've been using JSON more and more extensively. The basic data file for the web site is a 168 megabyte JSON file. Not indenting this kind of file makes for "interesting" problems if one accidentally opens it in an editor or on a terminal screen, a million characters all on one line tends to confuse the best-written text reading utilities. So after years of suffering the relief is tremendous, and now I have tab-based indentation in JSON::Create.

Originally I thought that I should make all kinds of customisable indentation possible, but then it occurred to me that basically any fool armed with a regular expression could easily alter the indentation however they want to. I put a simple example in the documentation.

Is it possible to return to development with traditional P5P mailing lists?

I still think the traditional method is suitable for advancing Perl development.

why?

We're used to it, and Perl development has been done that way.

We tend to think of it as a poor method, but it's actually a good one.

The first is that it will be developed with backward compatibility in mind.

The second is that we will not proceed unless there is a lot of consensus on the important points.

Some people say that Perl development can't proceed because of opposition.

I think there is no need to proceed with development with a lot of opposition.

I think it's important to find a way that as many people as possible can agree.

The culture of being able to decide everything because we have a majority is not good.

Make everything public and discuss about important decisions.

Small decisions are made by good P5P leaders.

On the other hand, big decisions will be disclosed and discussed to all users.

If the opposite happens, it's a normal reaction.

Is it possible to adjust features and modifications to the point where an agreement can be reached?

Is it possible to return to development with traditional P5P mailing lists?