Matias Korhonen

I'm a Ruby developer from Helsinki, Finland. You can find me and my open source projects on GitHub as matiaskorhonen, I occasionally blog about programming and a variety of random things at randomerrata.com, and I'm on Mastodon as @matias@ruby.social

Random Errata is my blog, where I occasionally write about tech stuff, beer making, and other random things.

Talks

Doing terrible things with ruby.wasm

Sure, Ruby 3.2 brought Ruby support to the browser and that's great and all but what else can we do with it? Maybe we can compile it back to C with wasm2c or use it with Deno to create a fully static build of Ruby?

Video from Euruko 2023

Ruby ❤️ Rust

A very quick intro to Rust-based gem extensions and an even quicker introduction to Rust itself.

Video from Helsinki Ruby Brigade (May 2023)

A Benjamin Button History of Ruby

Oh no, it looks like Ruby has started ageing backwards and it's shedding language features version by version. First we'll lose pattern matching from Ruby 2.7 and it's only a matter of time before we lose the safe navigation operator from Ruby 2.3 and eventually even 1.9 style hashes will be gone. In this talk we take a Ruby script designed to run using the latest bells and whistles of Ruby 2.7 and port it to earlier versions of Ruby version by version. How far can we take this? Let's find out together!

RubyConfBY 2020

Ruby like it's 1995

Cast your mind back to the year 1995. Gansta’s Paradise is the top hit of the year. Friends is the hottest show on TV. And just days after I turn nine, Matz releases Ruby publicly for the first time. In this talk I go back to Ruby 0.95 and see what it takes to get it running on modern hardware.

Rails Security: above and beyond the defaults

I originally gave this talk at Rubyfuza 2017 and subsequently repeated it for the Ruby Dev Summit online conference.

The talk is about generic web security with a particular regard towards securing Rails applications.

Blog version (images + text)
Video from Rubyfuza 2017

Things I've made

Piranhas

Piranhas is a book price comparison tool. Search through six Amazon country-specific stores, the Book Depository, and Wordery to find the cheapest source for your books.

Beer Styles

Beer Styles wraps up the 2015 and 2008 BJCP Style Guidelines in a pleasing interface on the iPhone and iPad.

Brewing Utilities

A collection of useful calculators for homebrewing. Refractometer conversion, kettle volume, dilution and boil-off, and priming sugar calculators.

An accredited Internet Astronaut from Finland.

Blog