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Come talk about what you did at or near OSCON. Free-form discussion, followed by beer at the Lucky Lab.

The monthly meeting of the Portland Perl Mongers

peaker: Chad Granum

Chad will give 2 shorter talks in a row. The first talk will deal with lists, what they are, how to use them. The second talk is a short presentation on several useful tools/utilities that started as part of the Fennec project but have been pulled out for general use.

Practical Lists Chad will define what a list is and how it differs from an array. He will cover tools such as grep and map, as well as some List::Util functions. He will explain how you may start using lists in more places when you understand how they work.

Utilities pulled from Fennec Fennec was a large undertaking, it also required implementing a few new ideas. Many of the new ideas are useful outside of the Fennec project. Chad will cover the following until he runs out of time:

Exporter::Declare Method::Workflow Child Exodist::Util Devel::CallerStack

How to Lie Like a Geek speaker: Michael Schwern

Geeks have a special relationship with The Truth. Nothing is more important than correcting a falsehood, no matter how small, and nothing is more odious than not telling The Truth. Unfortunately, in speaking The Whole Truth and Nothing But The Truth, the meaning is often mangled and the end result is the opposite, a lie.

We’ll examine some ways geeks lie while telling The Truth, to themselves and to others, and hopefully achieve better communications, easier to understand interfaces and maybe some personal enlightenment.

Some examples include: Lies by omission, lies by precision, lies by irrelevancy, lies by design, lies with statistics and that most dangerous of words “should” as in “the user should have realized”.

There will be cake. http://tinyurl.com/mermtx

As always, the meeting will be followed by social hour at the LuckyLab

Codesprint for learning about Perl 5 development, git and getting 5.10.1 out the door. This is our first codesprint, so things are still a bit up in the air.

Useful stuff:

5.10.1 blockers: http://tr.im/perl5_10_1_blockers

Using the Perl git repo: http://perl5.git.perl.org/perl.git/blob/HEAD:/pod/perlrepository.pod (short and sweet)

How to hack the Perl internals: http://perl5.git.perl.org/perl.git/blob/HEAD:/pod/perlhack.pod (kinda scary)

This will be a guided "hack session" about getting involved with the development of Rakudo, the first fully-featured Perl 6 implementation, which runs on the Parrot Virtual Machine. There will be a briefing at the beginning of the meeting to bring everyone up to speed and clarify any confusing terminology.

Then we will break into groups and learn-by-hacking on whatever interests the participants. You must be interested in doing something with Perl 6/Rakudo, start now!

The end of the meeting will be a short wrap-up where people voice there experiences working on Rakudo (what needs to be made easier? what rocks? what sucks? what do you want to work on next time?).

PDX.pm normally meets at 7-till-7 (6:53pm) at FreeGeek for roughly an hour or so, then walks a few blocks to the Lucky Labrador Brew Pub for social hour.

PDX.pm meetings are on the second Wednesday of each month at 6:53pm, typically at Free Geek. Meetings are free-of-charge for all PortlandPerlMongerMembers. The cost for non-members is $2,000,000,000.00 per person.

What tools and techniques do you use to keep your project shiny and well-oiled? Bring a sample for show-and-tell, or just a few things to say about it.

Please see the kwiki link for the latest details about this meeting. Our panels always lead to interesting and surprising discussion.

Join us at Freegeek for this month's installment of PDX.pm.

As always, join us for beers at the Lucky Lab after the meetup.

Bring your projects to an informal project hack night tonight at Freegeek! We might move the projects to somewhere with beer, and head to the Lucky Lab Brew Pub early.

Deploying Perl Applications with Carton

Speaker: Ian Burrell

CPAN has lots of useful Perl modules and it makes it easy to install them. But it has the problem of how you specify the modules your application needs to install, how you replicate the install on different machines, and how you keep applications and system packages separate.

Carton is built on top of Cpanminus and local::lib. Cpanminus is a simple command-line tool for installing CPAN modules. local::lib helps install modules into an application directory. It uses a new file format, Cpanfile, to define the module deepencies, including version specification. It records the installed versions so the specific sets of modules can be recreated on other machines and is checked into version control.

We use Carton to install modules for our large Perl applications. It allows developers to install modules without installing system administrators. Since installing modules can be slow, we implemented caching on top of Carton. We deploy applications with Capistrano and have integrated Carton into our build and deployment process.

As always, meet us at the Lucky Lab for some beer and good company following the meeting.

Hack night at PDX.pm! Bring a project or a module to work on. The floor is open if you have anything to demo. If you don't find us at Freegeek, stop on by Lucky Lab Brew Pub.

Highly Functional Programming

Speaker: Eric Wilhelm

Functional programming is very pure and elegant when nothing can change, and the computer can reason about your code for you -- in theory. Reality is messier, but Perl and other high-level languages support pure functions as a subset of the procedural and OO paradigms, so why don't we use them more? Functional techniques are good problem solving tools, useful for event-driven programs, and can be mixed into traditional OO and procedural codebases for better code reuse and testability.

In this talk, we'll look at some benefits of purely functional programming from a pragmatic and procedural viewpoint. There will be absolutely no mention of monads because we will just ride our lambdas through the mud and get it done. We'll see how good programming practices tend to suggest stateless and functional approaches. We'll examine techniques for refactoring which separate functions from state changes and allow you to better test and reason about your code. Finally, we'll look at language interpreters and discuss how technology might be able to help get even more benefits out of highly functional programming approaches.

This is a preview of an upcoming OSCON talk.

As always, meet us at the Lucky Lab for some beer and good company following the meeting.

Rafael will be doing a demo and some live coding using Light Table -- an IDE that, among other features, offers live evaluation of code -- along with a plugin for Light Table that enables live evaluation of Perl code.

We'll follow up and close out with some open floor discussion time.

As always, the meeting will be followed by social hour at the Lucky Lab Brew Pub.

Module Interface/API design

Speaker: Chad 'Exodist' Granum

Most developers create a module when they want to solve a problem. Most focus goes into the inner-workings of the module. Interface often takes a backseat and is addressed as an afterthought. This approach to interface design leads to horrible headaches.

For Part 1 Chad will be introducing several module interface paradigms. This includes a brief review of OO, as well as simple exporters and declarative builders. Examples from common CPAN modules will be given.

For Part 2 chad will take attendees through an exercise in designing an API for an example module that is actually useful (and not simply a toy for the example). We will weigh the pros and cons of different interface possibilities as well as show a complete implementation.

As always, the meeting will be followed by social hour at the Lucky Lab Brew Pub.

More information

Open Sourcing DBIx::Class::Events

Andrew Hewus Fresh will be giving a trial run of his TPCiP talk

While I will explain a bit about what DBIx::Class::Events does and how it works, this talk is primarily about open source contributions being driven by the folks in a company who care about them and how it is up to those people to provide the resources and knowledge to everyone else in order to create an open source culture in the workplace. As far as I know, no request to open source something has ever been denied by my employer, Grant Street Group, and while the company has always had the same "go for it" attitude, the folks writing code are only just starting to gain momentum releasing things publicly. I'll talk about showing other folks in the company the benefits of sharing code internally, how that exposed the benefits of open-source in general, and how we as a company progressed to getting DBIx::Class::Events onto the CPAN.

CPAN and Core Q&A

Bring your questions (and answers) about how things work under the hood and behind the scenes.

Possibly some entries for the Euler/shootout challenge.

As usual, meetings are followed by social hour at the Lucky Lab.

Show and Tell night! Bring your projects, problems, and presentations for show and tell/lightning talks. As usual, the meeting will be followed by social hour at the Lucky Lab Brew Pub.

Topics include:

• Anthony - Memory profiling and Test::LeakTrace
• You - Something

More information

fennec is an alternate testing framework for perl. It's author will discuss recent improvements that have been made as the project has developed.

"what is this perl5i thing?" MichaelSchwern talks about perl5i with possible hackathon to follow.

As usual, the meeting will be followed by social hour at the Lucky Lab Brew Pub.

ØMQ Sockets in Perl

Speaker: Anthony Johnson

Part message queue, part socket implementation sugar, ØMQ can be used to simplify socket communication and to scale out applications, and you don't even have to worry about the awful parts of socket communication. But more aptly and straight from the horse's mouth:

ØMQ (also seen as ZeroMQ, 0MQ, zmq) looks like an embeddable networking library but acts like a concurrency framework. It gives you sockets that carry atomic messages across various transports like in-process, inter-process, TCP, and multicast. You can connect sockets N-to-N with patterns like fanout, pub-sub, task distribution, and request-reply. It's fast enough to be the fabric for clustered products. Its asynchronous I/O model gives you scalable multicore applications, built as asynchronous message-processing tasks. It has a score of language APIs and runs on most operating systems. ØMQ is from iMatix and is LGPLv3 open source.

Find out what ØMQ is, where to use it, and learn about common patterns, pitfalls, and how it can be used for building anti-RESTful APIs. Anthony will elaborate on what it took to build a scaled out application and API using Python, Perl, and ØMQ.

As always, the meeting will be followed by social hour at the Lucky Lab Brew Pub.

More information

Note the (temporary) location change. This is possibly the last of the meetings on 2nd Wednesdays and a break from Free Geek while we figure out the keys/space issues.

We'll be discussing all things Perl and generally socializing in or near some tasty beverages. If you are new, look for the pdx.pm t-shirts[1].

Feel free to bring a laptop if you have some code or Perl questions to share or work on. (Or if you have no laptop, just bring the code/url.) I would also like to hear your ideas and proposals for future meeting topics and presentations.

The other meeting was last Thursday (Sept 8th), also at the Lucky Lab, where we began voting on whether to move the meeting to 2nd Thursdays. You get one vote for each time you show up (vote for both days or one twice.)

Rumor has it that the classroom at Free Geek is being redone into rows of desks with a whiteboard and projector -- which makes 2nd Wednesdays more viable, though the meeting room might still be a better space for us.

[1] My shirt is often purple. There was talk on irc.perl.org/#pdx.pm of getting a '$_' bat-signal to shine on the ceiling, but no volunteer yet.

Note the new date and (temporary) location change. This is a trial run at changing to 2nd Thursdays and a break from Free Geek while we figure out the keys/space issues.

We'll be discussing all things Perl and generally socializing in or near some tasty beverages. If you are new, look for the pdx.pm t-shirts[1].

Feel free to bring a laptop if you have some code or Perl questions to share or work on. (Or if you have no laptop, just bring the code/url.)

The other meeting will be next Wednesday (Sept 14th), also at the Lucky Lab. You get one vote for each time you show up (vote for both days or one twice.)

Rumor has it that the classroom at Free Geek is being redone into rows of desks with a whiteboard and projector -- which makes 2nd Wednesdays more viable, though the meeting room might still be a better space for us.

[1] My shirt is often purple. There was talk on irc.perl.org/#pdx.pm of getting a '$_' bat-signal to shine on the ceiling, but no volunteer yet.

This event overlaps with PDX Hackathon! Some type of tech user group jousting may occur.

speaker: Rob Buels

If you're writing anything bigger than a few hundred lines, you should be using Moose.

Rob will give an introduction to Moose: what it does, why you should be using it, and the basics to get you started.

As always, the meeting will be followed by social hour at the Lucky Lab.

speaker: Jonathan 'Duke' Leto

How to write and install Perl 6 modules.

Jonathan will use his module (Algorithm::Soundex) as an example and cover how to install modules with panda (the equivalent of cpanminus for Perl 6)

As always, the meeting will be followed by social hour at the Lucky Lab.

speaker: Eric Wilhelm

Shebangml is a markup language which saves programmers from gouging their eyes out on pointy angle brackets.

Most pointy ML data (SGML/XML/XHTML/HTML) can be translated to and from this human-readable, bacony syntax. This allows modern programmers to interface with legacy software such as WWW browsers and other relics like "Enterprise Java Software". But the true power of shebangml lies in the '#!' (hash-bang/shebang) and its programmable templating features. Unlike most "don't make me write HTML" generators and markup replacements, hbml preserves the good parts of the quoting constructs and attributes+content nature of XML. This makes it not only a fine replacement for obsolete markup languages, but also an ideal foundation for new dialects and applications. The pluggable syntax and interpreter allow you to define static or dynamically loadable constructs, which allows your application to balance convenience features with security issues using clear separations.

This presentation will cover the Shebangml syntax, the basics of the parser/interpreter module, the extensions API, and two real-world applications (the FreeTUIT declarative GUI toolkit and the presentation generator Text::Slidez.)

As usual, the meeting will be followed by social hour at the Lucky Lab.

In celebration of having already executed one successful emergency rescheduled meeting replacement beer-drinking social hour this month, we'll be starting 22 minutes later and roughly 0.7 furlongs norther than the usual time and space.

I will put out a pdx.pm sign. We might be out back depending on how crowded and noisy it is. You can also probably find us with or near the weekly hackathon folks.

7th-ish Annual-ish Michael G Schwern pdx.pm Presentation

Presentation details to be determined. (Rumored to be about small, furry creatures with antlers aka OOSE.)

As usual, the meeting will be followed by social hour at the Lucky Lab.

speaker: Jonathan "Duke" Leto

So, there's this dude named Travis who lives in a cloud and has nothing better to do on a Thursday night than download your latest commit, run your tests, and ridicule you on the twitternets when you broke the build... or something like that. But even if you don't need your pocket to jiggle on the way to fried pies, you should have some sort of automated continuous integration setup testing your code to keep you and your commits working smoothly. Jonathan will talk about Travis CI, demonstrate setting-up Travis for a public github project, and cover some of Jitterbug.

As usual, the meeting will be followed by social hour at the Lucky Lab Brew Pub.

speaker: Chad 'Exodist' Granum

The DCI concept was created by Trygve Reenskaug, (inventor of MVC) and James Coplien.

DCI Stands for Data, Context, Interactions. It was created to solve the problem of unpredictable emergent behavior in networks of interacting objects. This problem shows itself in complex OOP projects, most commonly in projects with deep polymorphism. This is a problem that Procedural/Imperative Programming does not have.

DCI does not replace OOP, instead it augments it with lessons learned from looking back at Procedural Programming. It defines a way to encapsulate use cases into a single place. This provides an advantage to the programmer by reducing the number of interactions that need to be tracked. Another advantage is the reduction of side-effects between contexts.

Another way to look at it is that a DCI implementation is much more maintainable as a project matures. Changes to requirements and additional features cause clean OOP project to degrade into spaghetti. DCI on the other hand maintains code clarity under changing requirements.

You will Learn:

• How to think in DCI
• How the DCI cpan package helps you write DCI
• That you may already write things in a form of DCI
• How a DCI implementation compares to an OOP implementation (in a generic task)

As usual, the meeting will be followed by social hour at the Lucky Lab.

Tonight will be a round-table session discussing your favorite Perl features (whether new or old) and sharing fun tidbits you've found on your programming and debugging adventures. Whether you're exploring perl5i and other wild new meta layers, learning new tricks with Moose, or discovering the bottom half of the open() pod, come and share your knowledge (and questions) with the group.

As usual, the meeting will be followed by social hour at the Lucky Lab.