Matej Cerny

IntelliJ IDEA x Scala: Write Scaladoc with Markdown

💡 Did you know that in Scala 3, ScalaDoc supports Markdown by default? #scala www.youtube.com/watch?v=F9sR...

My last day drinking "Madeira Libre". 🥃

I briefly checked what happened while I was hiking, and it looks like I have a lot of reading to do!

Not gonna lie, I'm not sure if I'll start next week on a positive note.

No Scala content this week as I'm hiking in Madeira. 🇵🇹

One note though - it's impossible to rent an EV here, so we went with a petrol Skoda.

It is amazing how a "brand new" 2025 model car feels like ancient technology.

I'm not convinced direct style is actually simpler. You are just trading flatMap chains for Context Functions and Givens. And the functions are still colored, just with a different shade. Please, let Scala be Scala. Don't try to make it Go.

Happy to be proven wrong, though.

Reading the new Scala concurrency proposal.

To me, it feels like it's going against the majority of the ecosystem. Instead of building parallel worlds and restarting the language yet again, I'd rather see a truly monadic Future that interoperates seamlessly with the FP stack. #scala

In sbt 2.0, --client mode becomes the standard. But you should be using it today. ☝️

It spins up the server in the background, so you don't even need a separate terminal window with sbt open.

(Unless you're obsessed with memory control like me 😀)

#Scala

Finally... a sane way to work with Jira! #Claude

And yes, this release also includes initial debugging support! 🐞

Testing in Zed is finally seamless with the newest version of the Scala plugin! 🎉

Basic tasks and test buttons now work straight out of the box. No setup required.

Watch it in action 👇 #scala

One note though: a simple comment in the contributors release thread would have saved early adopters a lot of guessing 🤷

Postmortem of scala/scala3#24994 | The Scala Programming Language

Good engineering teams own their mistakes.

What went wrong with the initial release of Scala 3.8 and how the compiler team fixed it in such a short time?

Detailed breakdown 👇 #scala
www.scala-lang.org/blog/post-mo...

Scala tooling has definitely rough edges, but name me a single ecosystem where the dependency bot can seamlessly update your dependencies, rewrite the codebase to match the newer API, and send a green PR?

I'm talking about Scala Steward + Scalafix rules, of course. 🚀 #scala

The Sovereign Tech Fund invests in Scala | The Scala Programming Language

Big shoutout to the German tax payers for funding the future of Scala! 🇩🇪💸

The budget won't only go to the Standard Library, but will also impact the tooling we use daily:

📊 scoverage
⚙️ sbt 2.0

Danke schön!

www.scala-lang.org/blog/2026/01... #scala

Forms4s: Rapid (Internal) UI Development Scala.js is genuinely great. It lets backend developers build web applications using the same language, type system, and mental models they…

Check out the new Forms4s library by @krever01.bsky.social. It ships with Tyrian 👾 support out of the box, but because it's composable, you aren't locked into a specific UI framework.

medium.com/business4s-b...

"Scala.js doesn’t need to compete with TypeScript and React for customer-facing products. There is a much better and more realistic opportunity: internal tools."

I completely agree. The sweet spot for Scala.js isn't the landing page. It's the Admin Panel. 🎯 #scala

zoxide has forever improved the way I navigate in the terminal.

💡 I finally installed zoxide last week. If you haven't, do it now!

It's a smarter cd command that learns your habits. No AI involved, just good old-fashioned statistics.

Go watch this video, I promise you'll love it! ❤️

youtu.be/aghxkpyRVDY

Fun JVM: Modern abstractions for FP with ZIO Prelude + other Scala/Clojure talks, Mon, Feb 9, 2026, 6:30 PM | Meetup **NOTE: we had to change to the 9th from the originally advertised 2nd.** *We'll meet at Adastra office, Mississippi House at Karlín. We'll gather at the ground floor at t

Prague friends! 🇨🇿 The next Functional JVM meetup is happening on Feb 9th at Adastra.

The topic is spicy, they are pitching it as "modern abstractions" that aren't just a copy of Haskell 😼

🏖️ I’ll be enjoying some time off so I can't make it.

Register here: www.meetup.com/functional-j...

#Scala

Scoped Error Capabilities in cats-mtl

This video should have been called "The most complicated implementation of a Counter". I'm leaving with more questions than answers 😀 #scala youtu.be/cTKWpYMciV8

Metals v1.6.5 - Osmium | Metals We're happy to announce the release of Metals v1.6.5, which brings several

And that's not all. Version 2.0 is currently in the works, aiming to handle indexing at 1 million lines per second. Unbelievable! 🚀

scalameta.org/metals/blog/...

⚠️ One breaking change, though: the MCP server endpoint changed from /sse to /mcp to align with the latest specification. But no worries, migration should be automatic.

Metals now also indexes and shows the type hierarchy whenever you place your cursor on a class, trait, object, or type. 🌳

The newest release of Metals is one step closer to feature parity with IntelliJ! 🎉

Version 1.6.5 can now suggest methods from implicit classes that are not yet imported. This is a long-awaited feature! #scala

I just tried Slack AI, and it’s arguably the best use case for LLMs I’ve seen in a SaaS product.
Look at this summary: 👇
Does MS Teams have the same feature?

Scala 3.8 released! | The Scala Programming Language

Now it's official! 🎉 Go read the whole announcement 👇

www.scala-lang.org/news/3.8/ #scala

Hey, Scala early adopters! 🚀 Version 3.8.1 is technically out, but let's wait until everything is officially settled and announced, okay? The upgrade is huge, so it's completely understandable that there might be some minor linkage problems. 🛠️ #scala

I realized today while watching my son 🧒 try to get dressed:

The peak of humanoid robotics isn't doing a backflip or writing code.

It’s the ability to successfully put on a t-shirt and shoes 👕👟

Deprecate -Xfatal-warnings option for Scala 3.8+ by EnviousSwan · Pull Request #225 · typelevel/scalac-options · GitHub Closes #219 Getting this error with Scala 3.8.0 and sbt-tpolecat 0.5.2 [warn] Option -Xfatal-warnings is a deprecated alias: use -Werror instead [error] No warnings can be incurred under -Werror

🚨 Scala 3.8 deprecates `-Xfatal-warnings` in favor of `-Werror`.

Be aware if you rely on `sbt-tpolecat` or `typelevel/scalac-options`, as they need to update their default flag sets.🚩

The fix is already in progress 👇
github.com/typelevel/sc... #scala

Also, notice that public methods start with a capital letter. In Go, visibility is controlled by casing, not keywords ☝️

The first thing that hits you when starting with Go:

"Wait, how do I implement this interface?"

Well, you can't. Not explicitly. Go's philosophy is: If you walk like a Duck and quack like a Duck, the compiler just assumes you are a Duck. 🦆 #golang

Higher Kinded Types with Java and Scala In this post we will see how Higher Kinded Types types can help increase the flexibility of our code and reduce duplication.

Java doesn't support Higher Kinded Types.

But with enough determination, boilerplate and type gymnastics, you can technically emulate them. 🤸‍♂️

#Java #Scala

blog.scottlogic.com/2025/04/11/h...