Spoiler Alert: This weekly challenge deadline is due in a few days from now (on August 6, 2023 at 23:59). 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 2: Empty Array
You are given an array of integers in which all elements are unique.
Write a script to perform the following operations until the array is empty and return the total count of operations.
If the first element is the smallest then remove it otherwise move it to the end.
Hey! I know, I know: long time, no blog. I would love to blame the pandemic, but the truth is, I just haven’t been inspired with any sufficiently Perl-y topics lately. Until recently, when I ran into this.
Now, once upon a time, I wrote a post about a small buglet I had encountered. The post presented the problem, then asked you if you saw the problem, then explained what was going on. So let’s do that again. First, the code:
sub generate_temp_file { state $TMPFILES = []; END { unlink @$TMPFILES } my $tmpfile = `script-which-generates-tempfile`; chomp $tmpfile; push @$TMPFILES, $tmpfile; return $tmpfile; }
As before, the actual code does a bit more, but I promise I’ve omitted nothing that’s relevant to the bug. Do you see it? If not, click to find out more.
Previously I showed parts of the API of my new module Graphics::Toolkit::Color. This time I want to mention some bits about the code base, which demonstrate what I tried to say long ago (sorry for the long delay i hope I can complete the series).
Please welcome the latest JSON tool for the command line: jp!
jp (mostly named from the Mojolicious class Mojo::JSON::Pointer that makes jp possible) is a command line tool for quickly extracting data from a JSON object. How many times do we get a complex JSON object from some command and we just need to extract a specific set of values from it? Every time! All the time! Often, people use basic tools like grep and sed. Most people reach for jq, but I find the syntax too cumbersome to use just to extract my desired data. I just want to use JSON Pointers and move on, but, indeed, sometimes JSON Pointers aren't even enough. jp really shines with some helpful command line arguments, a regular expression JSON Pointer syntax, and, finally, a Perl eval argument for total power.
Get on with it
Let's see jp work. Each example explainer links to the JSON Object used for the example.
Spoiler Alert: This weekly challenge deadline is due in a few days from now (on August 6, 2023 at 23:59). 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: Unique Sum
You are given an array of integers.
Write a script to find out the sum of unique elements in the given array.
Example 1
Input: @int = (2, 1, 3, 2)
Output: 4
In the given array we have 2 unique elements (1, 3).
To have a secure SMTP delivery, use Email::Sender. Mail::Sendmail uses SMTP for transport and there's no other type of transport. It does not support SMTP authentication, which my SMTP server now requires even for access from localhost. From what I read and tried once or twice in the past, the current "best practice" or recommended way is to use Email::Sender. Here's an incantation to send mail using sendmail:
use Email::Sender::Simple qw(sendmail); use Email::Simple; use Email::Sender::Transport::Sendmail qw(); use Try::Tiny;my $email = Email::Simple->create( header=>[To=>$to, From=>$from, Subject=>$subject], body=>$body, );try { sendmail($email, {from=>$from, transport=>Email::Sender::Transport::Sendmail->new}); } catch { print "Can't send mail: $_"; }
It's easy to switch transport to SMTP (just change two lines).
It's easy to add SMTP authentication (just pass arguments to transport constructor).
It's easy and clear where to add custom email headers (whereas in Mail::Sendmail, some arguments are "magical"/processed, they do not correspond 1:1 to headers).
It's easy to construct multipart email (construct the appropriate $email object).
In addition:
Envelope sender and RFC822 From is clearly separated, forcing beginners to understand the concept.
So there you have it, sending an temp email in Perl the modern way. No longer apt for one-liners though.
Kephra, an editor for programming (mostly Perl) written in WxPerl is my main project since I stumbled into the Perl community. Most people I know already heard of it - but I want to write about a new development that might be helpful for some, which might consider to use it even if it has a very limited feature set (forth rewrite baby!).
TPF has launched an online store with Perl merchandise (swag) celebrating the Perl 5.36 release. The marketing committee plan to do a custom celebratory collection for each release of Perl with revenue from each sale goes to TPF's Perl fund.
The store includes long- and short-sleeved t-shirts, sweatshirts, hoodies and stickers - all featuring a new Raptor image for the 5.36 release.
Spoiler Alert: This weekly challenge deadline is due in a few days from now (on July 30, 2023 at 23:59). This blog post offers some solutions to this challenge. Please don’t read on if you intend to complete the challenge on your own.
Task 2: Roman Maths
Write a script to handle a 2-term arithmetic operation expressed in Roman numeral.
All this talk about types, objects, and systems, got me to thinking, "what would it take to create a 100% backwards-compatible pure Perl proof-of-concept for optionally typable subroutine signatures". I mean really, how hard could it be? So I started sketching out some ideas and here's what I came up with:
use typing;
sub greet :Function(string, number) :Return() {
my ($name, $count) = &_;
print "Hi $name, you have $count messages waiting ...\n";
}
As I sit pondering my peas at the dinner table, my thoughts are unnaturally drawn to the
similarity between these pulses and Perl. A famous poet once said
that "For a hungry man, green peas are more shiny than gleaming pearls". From these
green orbs on my plate, the mind drifts to a recent virtual conversation
regarding logos, branding, rebirth and innovation in Perl. One wonders whether
such heated debates are important, relevant and what it might mean
for Perl in the future. The Camel (from the O'Reilly Book on Perl)
has long been the image associated with the language, along with the
Onion (Origin perhaps from Larry Walls' "state of the onion"
presentation). Personally it is not something that I feel passionately
about. "Perl, with any other logo would be just as quirky" as
Will Shakespeare is reported to have said. But The Camel is the popular,
recognisable standard "logo" with some, as yet to be tested, copyright and
trademark "issues"
Spoiler Alert: This weekly challenge deadline is due in a few days from now (on July 30, 2023 at 23:59). 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: Friday 13th
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.
Example
Input: $year = 2023
Output: 2
Since there are only 2 Friday 13th in the given year 2023 i.e. 13th Jan and 13th Oct.
Hello all. It's been a while. As you may have guessed there will not be a workshop this year. We spoke about organising one but the uncertainty around restrictions, along with other organisational constraints, resulted in our decision not to.
Perl isn't a strongly typed language, and its built-in types are limited and not generally accessible to the engineer, however, Perl supports various classes of data and in recent years has flirted with various ways of enabling runtime type checking.
In a strongly typed language the tl;dr; case for declaring data types is memory management, compile-time code optimization, and correctness. To this day I'm both impressed and horrified by the number of errors caught when I implement some kind of type checking in my programs. When it comes to runtime type checking we're only concerned with enforcing correctness.
Types, values, objects, signatures, and the systems that tie these all together, are all inextricably bound. They are necessarily interdependent in order to present/provide a cohesive and consistent system. Peeling back the layers a bit, types are merely classifications of data. Any given piece of data can be classified as belonging to a particular type whether implicit or explicit.
Eagle-eyed watchers of CPAN may have noticed that I've recently been releasing Type::Tiny development releases with version numbers 1.999_XYZ.
Type::Tiny v2 is intended to be compatible with Type::Tiny v1. If you've used Type::Tiny v1, you shouldn't need to change any code, but Type::Tiny v2 has a few new features which may make your code simpler, more maintainable, and more readable if you adopt them.
Spoiler Alert: This weekly challenge deadline is due in a few days from now (on July 23, 2023 at 23:59). 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 2: Zero Array
You are given an array of non-negative integers, @ints.
Write a script to return the minimum number of operations to make every element equal zero.
In each operation, you are required to pick a positive number less than or equal to the smallest element in the array, then subtract that from each positive element in the array.
Just released Graphics::Toolkit::Color for the purpose to create computationally harmonic color pallets (2-3 lines max for most needs). It is in fact a chunk out of Chart I needed to reuse in other projects as the Harmonograph. And as you can see in the SEE ALSO section of the POD - I'm aware that there are plenty other modules doing, parts, similar stuff or even more.
If you ever wanted to contribute to a Perl project now is a good time to give it a go!. Here are a few beginner friendly projects that are up-for-grabs and here is a list of Github projects with the "hacktoberfest' topic.
If you are a project owner and would like someone to participate in your project make sure to add the 'hacktoberfest" topic to a github/gitlab issue and promote your project on ( blogs.perl.org, perl.com/ ,Perlweekly, Perl Reddit , Medium ) or any other channels used to promote your Perl content.
Looking forward to seeing your Hacktoberfest pull requests!
