Just Graham and Aristotle this time.
These are some answers to the Week 285, Task 2, 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 September 8, 2024, at 23:59). This blog post provides some solutions to this challenge. Please don’t read on if you intend to complete the challenge on your own.
Compute the number of ways to make change for given amount in cents. By using the coins e.g. Penny, Nickel, Dime, Quarter and Half-dollar, in how many distinct ways can the total value equal to the given amount? Order of coin selection does not matter.
A penny (P) is equal to 1 cent.
A nickel (N) is equal to 5 cents.
A dime (D) is equal to 10 cents.
A quarter (Q) is equal to 25 cents.
A half-dollar (HD) is equal to 50 cents.
The Dancer Core Team is happy to announce that Dancer2 1.1.1 is on its way to CPAN. This is a maintenance release that deals with the following issues:
[ BUG FIXES ]
* GH #1712: Fix use of send_as in templates (Andy Beverley)
[ DOCUMENTATION ]
* PR #1706: Document missing logging hooks and log format option;
fix typo in logging test (Jason A. Crome)
Happy Dancing! Jason / CromeDome
In which thousands become millions, as we achieve a near-linear solution.
This week, the whole PSC was in attendance.
We merged HTTP-Tiny#6, and then discussed a number of topics:
Perl v5.40 introduced native true and false keywords. Unfortunately not all CPAN modules are ready to use them. One of those not yet ready is Mojo::Pg.
Normally you'd want to pass booleans to your queries as just 1's and 0's. However, since Mojo::JSON's true & false stringify to 1 and 0, my 5.38-using codebase is full of Mojo::Pg queries with Mojo::JSON's true and false as arguments.
This is a problem if I want to upgrade the perl interpreter of that project to Perl v5.40, because if I write "use v5.40;" in the file that contains those boolean keywords, Perl's builtin booleans will be used instead, which don't stringify to 1 and 0, but to 1 and the empty string, which can't be used by DBD::Pg in boolean fields and makes DBD::Pg throw an exception.
The solution I found was to subclass Mojo::Pg::Database, and wrap the query method, so that if Perl's builtin booleans are found, they are replaced in the query with native Pg booleans.
The source of the module and a lot more information can be found in my blogpost, here.
I have not been able to figure out how to run an async thread in the background while using a REPL like reply. The moment I run the main loop, it takes over the input from the REPL. Here's what a typical failed REPL session might look like.
These are some answers to the Week 277, Task 2, 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 July 14, 2024, known in France as Bastille Day, at 23:59). This blog post provides some solutions to this challenge. Please don’t read on if you intend to complete the challenge on your own.
You are given an array of integers, @ints.
Write a script to return the count of all strong pairs in the given array.
A pair of integers x and y is called strong pair if it satisfies: 0 < |x - y| < min(x, y).
Example 1
Input: @ints = (1, 2, 3, 4, 5)
Ouput: 4
Strong Pairs: (2, 3), (3, 4), (3, 5), (4, 5)
Example 2
After over a month without a PSC meeting, this was the first meeting of the new, shiny PSC. Today, we:
[This is my seventh YAPC / TPC. If you like, you can read about my other YAPC experiences: YAPC 2011, YAPC 2013, YAPC 2014, YAPC 2015, YAPC 2016, YAPC 2018.]
Well, after taking a very long break inspired (to understate it a bit) by the pandemic, I’m back to attending in-person Perl events with my seventh YAPC. Or, The Perl Conference, I suppose, but it still feels like YAPC to me. As per usual, here are some reflections.
Sometimes one needs an extra ounce of performance. Why not combine the high level semantics of Perl with the punch of assembly?
This repo includes various examples of how this can be done.
These are some answers to the Week 285, Task 1, 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 September 8, 2024, at 23:59). This blog post provides some solutions to this challenge. Please don’t read on if you intend to complete the challenge on your own.
You are given a list of routes, @routes.
Write a script to find the destination with no further outgoing connection.
Example 1
Input: @routes = (["B","C"], ["D","B"], ["C","A"])
Output: "A"
"D" -> "B" -> "C" -> "A".
"B" -> "C" -> "A".
"C" -> "A".
"A".
This block of code is valid Perl:
if (my $var1 = calc1()) {
say $var1;
} elsif (my $var2 = calc2()) {
say "$var1, $var2";
}As you can see, $var1, which is declared in the if clause, is visible inside the elsif clause too.
Perl never ceases to amaze me!
(Also appears in my blog)
I remember when one one of my grandchildren helpfully decided reorganise a bookshelf whilst by himself. Upon being discovered, sitting in front of an empty shelf with books strewn all around him, his instinctive reaction made me feel proud to be his grandpa. He looked up and said, “Oh dear! Oh dear! what happened?”, as if this calamity had occurred spontaneously, astonishing him as much as the angry parent who was going to have to tidy it all up. It is hard to hide amusement when you watch your kids have to deal with their kids.
Here I share my personal favourite core enhancements in Perl v5.40.
These are some answers to the Week 283, Task 2, of the Perl Weekly Challenge organized by Mohammad S. Anwar.
Spoiler Alert: This blog post provides some solutions to this challenge. Please don’t read on if you intend to complete the challenge on your own.
You are given an array of positive integers, @ints.
Write a script to return true if for every index i in the range 0 <= i < size of array, the digit i occurs exactly the $ints[$i] times in the given array otherwise return false.
Example 1
Just Graham and Philippe this time.
We talked about HTTPS in core, and some ideas about it, while the CPAN Security Group is preparing some proposals. Today was the deadline for releasing 5.41.1, but we don’t have volunteers yet, so Graham said he would do it sometime soon.
We also noted that we’ll need some volunteers for the next 10 or so development releases.
Wir freuen uns, die Veröffentlichung von OTOBO 11 bekannt zu geben! Die neueste Version der beliebten Open-Source-Ticketsystem-Software bringt zahlreiche Verbesserungen und neue Funktionen mit sich. Erfahren Sie mehr über die neuen Features und Änderungen auf OTOBO
Over the years that I have existed in four dimensions, I have come to accept that time is not a linear concept heading inexorably in one direction at a uniform rate. It didn't take an Einstein or Hawking to convince me either. Time is as malleable as the distortions applied by our consciousness, or imposed by those around us. Consider my youngest daughter's essay due to be handed in on Tuesday, a task assigned 4 months earlier. At 4,000 words, it represented roughly 6 words an hour allowing for eating, sleeping, work, weekend fun, and other essential time-devouring activities. Yet the "I have got plennnnty of time, chill, dad!" of a few months ago, has now turned into cries of despair, as she has to do an all nighter at her desk instead of being at some selfie-rich event critical to her mental well-being and social standing.
These are some answers to the Week 283, Task 1, 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 August 25, 2024, at 23:59). This blog post provides some solutions to this challenge. Please don’t read on if you intend to complete the challenge on your own.
You are given an array of integers, @ints, where every element appears more than once except one element.
`
Write a script to find the one element that appears exactly one time.
Example 1
Input: @ints = (3, 3, 1)
Output: 1
Example 2
Input: @ints = (3, 2, 4, 2, 4)
Output: 3
Example 3
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