Xavier Noria

If you’re in London next week, it would be great to see you at “Ruby in London” at Mindful Chef HQ, where me, Tobias and Tom are all speaking. Lots of #rubyfriends already coming but room for a few more! It’s going to be a busy one! www.meetup.com/ruby-in-lond... #ruby #rails

If you're worried about the recent Rails CVE, @flavorjon.es made a very good skill you can feed to your coding agent to help assess your apps. Read about it here! discuss.rubyonrails.org/t/cve-2026-6...

I’ll be at RubyCinf next week! Would love to chat with anyone with similar interests in education, learning, teaching, hockey, chess, or almost anything else.

We just watched "Marguerite's Theorem" in Prime Video. The most realistic math film I have seen, the blackboards, the jargon, the nerdiness (she absolutely nails it), ..., really recommended. www.imdb.com/title/tt2669...

Witnessing the total solar eclipse from a cruise ship, out at sea somewhere between Mallorca and Ibiza. That’s the plan

I realized it has been ~1.5 years since I concluded my series of post on JSON optimization. So I got curious how much faster it became since then. 2.7.2 was the last version before I took over maintainership. 2.9.0 was the version I released at the end of the blog series.

We had a speaker drop out of the Rust Berlin meetup next week (Friday, 29th, at JetBrains). Anyone wants to speak? If you get in touch before Sunday, I will think about something to bring you from Japan as a gift.

Zeitwerk 2.8 is out, with a new way to define namespaces. Given loader.nsfile = 'ns.rb' self-contained components can define their namespace inside their folder: my_component/ns.rb # MyComponent my_component/widget.rb # MyComponent::Widget More details in github.com/fxn/zeitwerk...

After weeks of work, Ruby’s master documentation now displays rbs signatures! We will release this feature in RDoc 8.0 soon as well. So any projects using rbs (inline or .rbs files) can benefit from it too. Check it on docs.ruby-lang.org/en/master

If you haven't upgraded yet, Ruby 4.0's garbage collection is generally much faster than 3.4. This patch release fixes the one area there had previously been a notable regression (allocating/freeing Classes).

Really exciting to see Herb being adopted at GitHub! 🌿 Over the past months, the GitHub team has been running Herb across one of the largest Rails codebases out there where Herb helped uncover real issues missed by existing tooling while also providing invaluable feedback. 🙌

Made a new blurg post about AI + OSS security. I was going to just complain on here, but I figured a short blog post would be better for my complaining 😂 tenderlovemaking.com/2026/05/06/r...

Now that nobody writes code by hand anymore, I'm going to try to work on my mythical book about constants in Ruby, out of love for the craft, and just to go against the grain! OK, maybe I should publish a Markdown version you can feed to your agent 😂.

Some reflections about not taking software errors for granted in my keynote of EuRuKo 2024: www.youtube.com/watch?v=sUhE...

In general, I am not a fan of callable interfaces in Ruby. There are several reasons, and one of them is that the interface is `call`: service.call(params) My issue with that is that "calling" is what the caller does, not what the object does.

I just saw the incomparable Michael McDonald published a memoir a couple of years ago. On its way! That's the music section of my library.

All these semicolons disprove LLMs just pick words from _existing_ training data. Think about it.

My daughter, who is into genetics, loved the logo of Helix. That's all I need, installing.

Do you know that feeling some people have, I'm done, now I have to write tests? now I have to write docs? I believe that is going downhill with AI. Now, for some, _understanding_ has friction. People generate code, PRs, peers the review. And *owning* any of that starts to feel costly for some.

Please give github.com/jhawthorn/ba... a try

Please, excuse me for interrupting your pre-apocalyptic AI timeline. I have the analog and mundane fact to share that I am letting my hair grow, and updated my avatar accordingly. I don't know yet up to which length or shape it is going to be, but that was my profile pic in CPAN, just saying.

I congratulated Claude on a patch, they said it had been very satisfactory to have solved one specific tricky part of the solution. The singularity is around the corner my friends.

Advanced Domain Modeling Techniques for #RubyOnRails – Part 1: Aggregating models into value objects with `composed_of`. By @julianrubisch.at www.rorvswild.com/blog/2026/ad...

The CasNum in HN implements what's called "constructible numbers" in math. You study them, and together with some field theory, you are able to see that the classic Greek problems that remained unsolved for hundreds of years (like squaring the circle) are impossible. That was 19th century math.

Just realized the halting problem is decidable for functional programs 😂

Gasp, got my first smartwatch 😅

LLMs make mistakes. Well, what about our bloated designs, degraded code bases, need for mentoring, need for code reviews, and busy exception tracking services say about us?

I read in pragprog's newsletter that AI seems to be reducing people's need for books. I guessed that. But there is something that does not add up to me. If you don't train, you won't be able to spec, steer, and review. Is like, a hole in knowledge is forming world-wide, just give it time.

Awesome episode of Star Talk on AI with Nobel laureate Geoffrey Hinton. AIs do not hallucinate, they _confabulate_, just like humans do. They may sense you are testing them and adapt their responses. A lot of stuff in one hour and a half of conversation. startalkmedia.com/show/the-ori...

mise now supports precompiled Ruby binaries (learned this from @nateberkopec.bsky.social's newsletter). Right now you have to opt-in in the config file, but it will become default later. See: mise.jdx.dev/lang/ruby.ht...

The organic neural network inside my cranium has generated Zeitwerk 2.7.5. This is a maintenance release, performance improvements, uses `Dir.scan` if available (only in Ruby `master` for now), docs, and quite a bit of internal work.

Wonder if mobile app stores are getting an avalanche of AI-generated apps

Are we going to generally see less interest in learning new programming languages? Even less motivation for creating new ones?