Radan

If you keep working on something, turns out eventually you may finish it. So it is with "Master Hotwire" book! I've finally finished it and it's available in Web, PDF and EPUB formats at masterhotwire.com I started working on it a bit under 2 years ago. :)

I unleashed my modest inner designer again this week and I'm proud to present to you the brand new rubocop.org! I hope you'll enjoy my take on the terminal linter inspiration for the design, and the long overdue playground (see rubocop.org/playground/) Feedback welcome! #Ruby #RuboCop

Here's a more detailed write-up about the massive #RuboCop 1.91 release metaredux.com/posts/2026/0... I've focused in the article on the new "preview" functionality (inspired by ruff and friends), but I've covered briefly the other notable improvements as well. #Ruby

Got myself a ticket for Euruko. Who else is going?

I’m trying to find user facing products built and maintained with Gas City (gascity.com), successor to Gas Town, but I’m not finding anything. Is this just performance art or is it being used for anything with users?

For all the people that like to say, "Coding Agents are like compilers" or "Why do you still read code, would you read the output of your compiler?" I have an amazing resource to recommend to you: craftinginterpreters.com

What AI? 😁

I care about code quality, which still maters (agents also work better with good code), but it's no longer as economical for me to craft it by hand. So I end up thinking more about how to precisely explain it rather than rely on intuition. Which is both harder and more rewarding. So that's nice.

Broadcasting Turbo refresh adds an extra round trip and a debounce delay. Broadcasting the content directly fixes that, but introduces a race condition. Here's how to keep fast, immediate updates without race conditions: radan.dev/articles/tur...

Social media rewards being sure: sure that this is the absolute best way to do the thing, that not doing this or that "will leave you behind", as if it was a fact. Can that ever be true? I'm not so sure.

Shrine 3.9.0 released, mostly polishing some rough edges and increasing compatibility between plugins. shrinerb.com/docs/release... And we've reached zero issues again after a long time 🤘🏻

I am exasperated with people accusing programmers of "gatekeeping" programming. We were practically dragging people through the gate. Do you know why a mindless LLM can tell you so much great programming information? It's because we've been sharing that information for free online for decades.

2 weeks ago, I attended RubyConf Austria in Vienna. A first day AI panel left me wondering: if programming languages are becoming irrelevant, will Ruby conferences still matter? Then, the next day, I noticed what to me looked like clues pointing to an answer. radan.dev/news/ruby-co...

I walked out of the forest at dawn, holding a map, to stop the first car and ask them if they can point on the map where we are.

Some photos from first day of RubyConf Austria:

“Big Tech’s Anti-Labor Playbook Has Come for Wikipedia” https://medium.com/@jakeorlowitz/wikipedia-is-doing-the-capitalist-thing-56a393232943 > Fire the engineers who know how the system works, fire the ones organizing labor, hope nothing catastrophic breaks before you can ship something splashy

Today, the agent was not succeeding in debugging so I used the debuggers to figure it out the ancient way. It's entirely possible that I could have used the AI differently to solve it slightly faster. But man, did it feel good to be deeply focused on a single thing. So good.

I was always a fan of trying out solutions. For really critical projects I'd give two of my team members different approaches to implement, so we can compare. I love that AI makes it also feasible to do for non-critical work: let it implement, learn from it, discard it.

When the world accelerates, invest more in understanding the fundamentals. Nobody knows what technological progress will bring tomorrow but we know it will sit on top of the foundation of fundamentals.

When a coding agent makes a plan I make a judgement call: Is this the kind of change where it is easier to review the plan or the final product? Complex output: review plan. Simple output: just approve and wait to review the results. The plan creation is still useful for the agent.

There's a strong split showing up everywhere in AI usage: if you can setup a reliable and deterministic verification loop, agents can solve the task successfully, in no time. Without it, especially if nuanced judgement is needed, they can produce convincing garbage in no time.

It is oh so tempting to multitask with more and more agents. Do you think you can out-multitask AI? More likely than not your real edge is in deep understanding that comes from undivided attention. Be careful how much depth you sacrifice by just trying to run more agents.

Make things better than others expect them to be. If nothing else, because you take pride in your craft.

One thing at a time Multi-tasking is mostly an illusion. What we're actually doing is slicing our focus, jumping from one thing to another and then back again. All that jumping decreases our productivity and worse, erodes our peace of mind. You're only doing one thing at a time anyway. Might as…

Simple code that clearly models the domain still matters: it is easier for agents to work with, easier to understand and makes bugs shallower. The values of frameworks like Rails and Hotwire are multiplied, not diminished.

A no comments lesson: Tests suddenly fail -> AI: I'll debug! -> AI: Assets not loading!! -> AI: writes 300 lines of custom asset loading logic -> AI: all green!!! -> Me: suspicious -> Me: Debug myself -> Me: Delete AI code and define literally one ENV var -> Tests are green. True story.

https://mike-sheward.medium.com/deleteduser-com-a-15-pii-magnet-c4396eb21061 Turns out a lot of companies just overwrite deleted users' email with a "deleteduser.com" email address and all you need to do to get a stream of personal data is register that domain and set up an catchall email address

After the success of vibe coding, I think the next obvious frontier is vibe writing: articles that the author prompts and never actually reads, and neither does anyone else.

It’s easy for Stimulus/JS to end up full of class toggling that’s really just presentation logic. CSS pseudo-classes can handle states like “empty,” “single item,” or “show/hide controls,” so your JavaScript can stay focused on behavior: radanskoric.com/articles/css...

If like me you were looking for the specific OpenBSD bug that Anthropic Project Mythos found, from what I can tell, it seems to be this one here: github.com/openbsd/src/...

Test coverage metrics are one of the tools for evaluating the quality of tests without reading them. Which is kind of relevant in the age of coding agents. So here, a short light intro to 4 different ones: line, branch, path and condition coverage. radanskoric.com/articles/how...

So, I switched to Ghostty terminal a week ago. Today I was surprised there's no scroll-back search. Then I notice that I have an update to apply. But what are the chances that very first time I encounter an issue it will be already fixed?!? Pretty good, apparently! ghostty.org/docs/install... 👏😀

Good news! Chat control is being pushed back: www.patrick-breyer.de/en/historic-...

I finally lost my shit about so-called AIs, LLMs, enshittification & everything fucking evil that @officialgrammarly.bsky.social is doing. I'm fucking furious, and not just about what 1 company has done. An open letter to Grammarly & the rest of the LLM hype machine www.moryan.com/an-open-lett...

Can someone recommend a really good introductory book on "process engineering"? If it's math heavy that's fine, actually even preferred.

Yes, @therubypassport.com is a bit of a handful, but it's something that only the Ruby Community has (AFAIK). Check out what goes into it 🙌

I wrote this song on Saturday, recorded it yesterday and released it to you today in response to the state terror being visited on the city of Minneapolis. It’s dedicated to the people of Minneapolis, our innocent immigrant neighbors and in memory of Alex Pretti and Renee Good. Stay free

Hey, psst… 🤫 Don't tell anybody, but you've got less than a week left to submit your talk to Blue Ridge Ruby. 🤐 Seriously, mum's the word. And whatever you do, don't share this link… 😶‍🌫️ blueridgeruby.com/cfp/