Chicago Perl Mongers

All About CSS Flexbox


This month, Doug Bell will be talking about a CSS feature newly-supported by browsers: The flexible box (flexbox). Flexboxes makes laying out rows or columns fast and easy. Simple things become much easier, and even complex layouts become simple and responsive for a variety of display devices like phones and tablets. If you haven't learned anything about CSS in the last few years, or if you know the pain of using CSS floats, come learn about flexbox!

Doug Bell has been developing websites since the time of table layouts and spacer GIFs (pronounced "jifs"). He's developed websites professionally for 10 years, and is the organizer of the #css support community on the Freenode IRC network.

The Perl Conference Post-Meeting


This month is The Perl Conference (formerly YAPC). Because of this, we have to move our meeting to June 29th. At the meeting we'll discuss the talks and announcements from the conference over food and drinks! RSVP for the meeting on our Meetup page.

If you haven't already, be sure to join the Chicago Perl Mongers on Slack using We're in the #perl channel, and I'll be talking about the things I see at the conference.

MySQL Database Performance For Developers


This month's presentation will be on MySQL Database Performance:

Let's face it, when it comes to databases, developers and DBAs don't often see eye-to-eye. This talk will help bridge the gap using a common goal, "Database Performance".

If you're a developer, you've probably used a query that was performing poorly. Many times the solution is seeking help from a DBA. The DBA performs some magic behind a curtain, and all the sudden the query is running fast. Wouldn't it be nice to take a peek behind the curtain to see the magic being performed? During this talk, we'll discuss several aspects of the database that can affect performance. This includes schema design, indexes, and queries. We'll also look at some real life examples of slow performance and performance solutions.

Jeremy Glick is a MySQL Database Engineer at ZipRecruiter. Before that, he worked as a consultant for various technology companies with systems ranging from dozens to hundreds of database servers. Jeremy is also the organizer of the Chicago MySQL Meetup. He holds multiple MySQL certifications and is a RedHat RHCE.

RSVP on the Chicago.PM Meetup

Due to Joel and Doug being at the Perl Toolchain Summit, we have to cancel the Office Hours this month. We'll have Office Hours again next month.

Test Environments for Modern Web Apps


This month, William Lindley ( blog) will talk about writing a test harness for modern Perl programs using Test::More, Test::Mojo for the API, and DBIx::TempDB for the database.

Building, testing, and deploying actual systems is more complex than merely writing a program. Real testing often needs to be done against databases of known large or problematic datasets. A test environment cannot affect production data. Staging even minor changes, so we can preview and find errors before moving to production servers, can prevent expensive errors. The "best practices" in this field are relatively new and still changing, and we look at the first steps from "I built this mockup last night" by building the test suite for a simple database-driven file-upload service with Mojolicious.

William Lindley has been hacking computers (in the good sense) since 1977, a database advocate since dBase II and PostgreSQL-predecessor Ingres in the 1980s, a Perl monger since 1994, and a free-software promoter since first getting Linux to run XWindows in 1995.

If time permits, Doug Bell (preaction) () will show a simple app to mock JSON REST APIs for testing using Mojolicious.

RSVP for the meeting on the Chicago.PM Meetup