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So today I am going to start some actual work on Paws by playing with Paws::S3. For those that do not know S3 is the Amzazon's Simple Storage System a place where we AWS types can store just about anything we want up on the cloud.

One part of S3 is the ability to change the storage state/class of an artifact. It all depends on what you are doing with the artifact. If the artifact needs to be shared across the web, like an image, you would just put it in the 'Standard' class. If you are archiving artifacts for safe keeping and there is no requirement to get them back right away you could put them int the 'Glacier' class which is much cheaper.

The London Perl Workshop 2019 is fast approaching on Saturday 19 October!

We've already had some great talks submitted and will start announcing these soon. If you'd like to tell people about what you have been doing with Perl 5, Perl 6 or any related topics please submit your proposal before the end of Monday 30 September.

If you have any questions then write to us at organisers@londonperlworkshop.org - we are happy to discuss ideas with you. See you at the Workshop!

CPAN is wonderful and it is vast. Task::Kensho offers a curated look at the best it has to offer for those who don't know what to look for. But to remain useful, it must keep up with the trends of CPAN and the community. Thus, the community's input is vital to its maintenance.

Please, take a moment and look through the open issues. Comment or add a reaction in support of changes that make sense to you, and open a new issue if you think something is missing.

New week new challenge!

And for this week we have two awesome tasks for this week's challenge, too awesome not to blog about it.

If you'd like to join the fun and contribute, please visit the site site managed by Mohammad S Anwar.

Generate a longest sequence of the following “English Pokemon” names where each name starts with the last letter of previous name.

audino bagon baltoy banette bidoof braviary bronzor carracosta charmeleon cresselia croagunk darmanitan deino emboar emolga exeggcute gabite girafarig gulpin haxorus heatmor heatran ivysaur jellicent jumpluff kangaskhan kricketune landorus ledyba loudred lumineon lunatone machamp magnezone mamoswine nosepass petilil pidgeotto pikachu pinsir poliwrath poochyena porygon2 porygonz registeel relicanth remoraid rufflet sableye scolipede scrafty seaking sealeo silcoon simisear snivy snorlax spoink starly tirtouga trapinch treecko tyrogue vigoroth vulpix wailord wartortle whismur wingull yamask

The above names borrowed from wiki page.

Well I think it is time I get back to blogging as the one month hiatus I originally planned has now stretched out to I think 10 or 11 months with only two little posts on the SPW back in August..

One of the positive notes from that rather depressing (at least from a Perl perspective) meet-up was the feed back I received on my one year's worth of blogging.

• I should try and do more community oriented posts rather than post from my own little development bubble.
• Go more for quality vs quantity.
• Try something new not something that has already been blogged to death.

So I am going to try and take these suggestion to heart starting with trying to give back the the community and as hacktoberfest is now running I think I will go for a t-shirt as well.

Do you hear SPVM until now?

If you don't hear SPVM, it is good chance.

SPVM is the project to improve Perl culcuration and array operation.

I recently do benchmark.

SPVM add(+) operator performance in for loop is same as C language!

It is faster than Perl 100x.

I'm creating SPVM document in Japanese.

You can see the following.

SPVM Document

I almost finish(90%) specifications.

SPVM Launguage Specification

SPVM Exchange API Specification - Link Perl world to SPVM world

SPVM Native API - Link SPVM World to C World

These are some answers to the Week 25 of the Perl Weekly Challenge organized by Mohammad S. Anwar.

Spoiler Alert: This weekly challenge deadline is due in several days from now (September 15, 2019). This blog post offers some solutions to this challenge, please don't read on if you intend to complete the challenge on your own.

Challenge # 1: Sequence of Pokémon Names

Generate a longest sequence of the following English Pokemon names where each name starts with the last letter of previous name.ù

audino bagon baltoy banette bidoof braviary bronzor carracosta charmeleon cresselia croagunk darmanitan deino emboar emolga exeggcute gabite girafarig gulpin haxorus heatmor heatran ivysaur jellicent jumpluff kangaskhan kricketune landorus ledyba loudred lumineon lunatone machamp magnezone mamoswine nosepass petilil pidgeotto pikachu pinsir poliwrath poochyena porygon2 porygonz registeel relicanth remoraid rufflet sableye scolipede scrafty seaking sealeo silcoon simisear snivy snorlax spoink starly tirtouga trapinch treecko tyrogue vigoroth vulpix wailord wartortle whismur wingull yamask

Command-line Interfaces using Modern Perl

If you Perl or you're Perl-curious, or you build command-line interfaces, you should read this, but before we dive in building the command-line application, lets first talk about the command line.

Command-line programs have been with us since the early days of the computer and are programs based upon on commands (single or multiple). A command-line program is a program that operates from the command-line or shell.

A command-line interface is a user interface that is navigated by typing commands in a terminal, shell or console, as opposed to using a GUI (graphical user interface). The console is a display mode for which the entire monitor screen shows only text, no images or GUI objects.

According to Wikipedia:

I’ll start with the second task, as the first one is somehow different (see below).

Inverted Index

Create a script to implement full text search functionality using Inverted Index.

An inverted index is an index storing a mapping from content to its location. I chose to store the filename and line number for all words in a given list of files.

I started Perl Newbies recently.

Perl Newbies is for yung people who want to learn Perl.

Perl Newbies describes basic things of Perl, not complex things.

Perl Newbies weekly report

I add the following entries about Functions and module.

What is "use strict"?

You may think you see perl program at first.

I describe effects of strict module.

• substr
• index
• rindex
• strict
• warnings

It appears that I have not had single blog post for 1 whole year. Let's face it, there isn't enough time in the day to everything one might want to do. Procrastination steals more than just time though. The longer one is away from a particular activity the more difficult it is to return to that activity physically or intellectually. Some of you will recall that I developed what I claimed to be the world's simplest GUI designer, GUIDeFATE. This was the topic of a couple of presentations already but as all such projects, remains in a state of flux.

I've been doing the Perl Weekly Challenge (PWC) for 3 weeks now. So far there's been unique challenges that made me utilize different modules. I even submitted a solution using APIs which I haven't done in my work because I didn't have any reason to. (lol)

If you'd like to join the fun and contribute, please visit the site link managed by Mohammad S Anwar.

Create a smallest script in terms of size that on execution doesn’t throw any error. The script doesn’t have to do anything special. You could even come up with smallest one-liner.

perl -e '$%'

I've still been thinking about proper OO in the Perl core and hit an interesting case.

Imagine the following, hypothetical Perl 5 OO syntax. Inheritance is handled via is and inheritance order is assumed to parent class declaration order. Thus, UnlovedChild inherits from MissingFather first.

What do you think the output should be?

class MissingFather {
    method shout() { say "I'm outta here!" }
}

class DrunkenMother {
    method shout($message) { say "$message!" }
}

class UnlovedChild is MissingFather, DrunkenMother {}

UnlovedChild->shout("Where's my beer?!")

These are some answers to the Week 24 of the Perl Weekly Challenge organized by Mohammad S. Anwar.

Spoiler Alert: This weekly challenge deadline is due in several days from now (September 8 , 2019). This blog post offers some solutions to this challenge, please don't read on if you intend to complete the challenge on your own.

Challenge # 1: Smallest Script With No Execution Error

Create a smallest script in terms of size that on execution doesn’t throw any error. The script doesn’t have to do anything special. You could even come up with the smallest one-liner.

I was first puzzled by this strange specification. Can it be that we really want a script that does nothing? Does it have to be the shortest possible script.

Well, after reading again, yes, it seems so.

I'll go for one-liners.

My script in Perl 5:

$ perl -e ''

I've finally found some time to get some wanted and needed changes implemented into berrybrew.

Some changes were for development and testing of the software itself, a couple of features were added due to community requests, and yet more were requested by a client.

Here's a summary of the new features:

Ricardo (Rik) Signes is a member of the Perl community who has helped the programming language move forward as far as features, stability, and popularity. Previously, he was Perl’s Pumpking (manager of the core Perl 5 language), during which time he oversaw 5 major releases. Currently, he is a board member at the Perl Foundation and CTO at Fastmail, leading a development team working in Perl every day.

This blog post is brought to you by Fastmail, a gold sponsor for PTS. More information about Fastmail is provided at the end of this article.

The main activity for me last month was "The Perl Conference in Riga". It was my second European Perl Conference and the most memorable one. You can read my full report, if you are interested. During the conference, I got to meet, Heart & Soul of any Perl event, Liz & Wendy. It is embarrassing that I still don't know who's Liz and who's Wendy. One day, I will sort that out once for all next time when I meet them. I hope they would attend the London Perl Workshop next month. I met Paul Johnson first time in person. I have interacted with him on Twitter before. I also met many CPAN contributors who received Pull Request from me in the past. Icing on the cake was a gift, a book titled "Learning to program with Perl6: First Steps" by JJ Merelo.

𝑒 is for economics

The first task of the 21st Weekly Challenge was a very old one:
to find (what would eventually become known as) Euler’s number.

The story starts back in 1683 with Jacob Bernoulli, and his investigation of the mathematics of loan sharking. For example, suppose you offered a one-year loan of $1000 at 100% interest, payable annually. Obviously, at the end of the year the markclient has to pay you back the $1000, plus ($1000 × 100%) in interest...so you now have $2000. What can I say? It’s a sweet racket!

This week's challenge is composed of three tasks.The first one is to get the n-th order of forward difference of a given list.

Suppose we have list (X) of numbers: 5, 9, 2, 8, 1, 6 and we would like to create 1st order forward difference series (Y). So using the formula Y(i) = X(i+1) - X(i), we get the following numbers: (9-5), (2-9), (8-2), (1-8), (6-1). In short, the final series would be: 4, -7, 6, -7, 5. If you noticed, it has one less number than the original series. Similary you can carry on 2nd order forward difference series like: (-7-4), (6+7), (-7-6), (5+7) => -11, 13, -13, 12.

Forward difference series

Create a script that prints n^th order forward difference series. You should be a able to pass the list of numbers and order number as command line parameters.