matejcerny
Matej Cerny

Scala & Functional Programming Engineer. Database/SQL Veteran. #FP #Scala #Postgres

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Last Notes

2026-05-20 06:27:29 UTC

Dependabot is finally getting support for sbt! 🎉
It is currently in beta, making it a decent option for polyglot companies wanting to keep all their security alerts in one native dashboard.
That said, #Scala Steward remains the best option for dedicated Scala ecosystems.
Check out the progress here: https://github.com/dependabot/dependabot-core/issues/352#issuecomment-4491065109

2026-05-14 08:02:31 UTC

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Aside from that "tiny detail", the language is doing great. Scala 3 has become the dominant version. Plus, with the rise of agents, we might finally close this topic for good. 👋
The Typelevel stack has become a de facto standard, no surprise there.
And even with lots of improvements over the years, the top concern is still tooling 🤷
Full report: https://scalasurvey2026.virtuslab.com/
Summary: https://virtuslab.com/blog/scala/our-impressions-from-the-scala-survey-2026

2026-05-10 18:45:39 UTC

It's JetBrains developer survey time again! With everything going on, I have a feeling that this could be the last one 🤷
https://surveys.jetbrains.com/s3/developer-ecosystem-survey-2026-sh?pcode=448289961348842151

2026-04-30 06:23:14 UTC

I genuinely disagree with most of the article. Yes, in the default setup, LLMs write poor Scala. But it takes less than an hour to configure them properly - installing Metals MCP, Cellar and a few skills. After that, the generated code is actually really good! #scala
https://scalac.io/blog/llms-mediocre-scala-push-back/

2026-04-03 14:39:52 UTC

💡 If you make a library, you should be its first user. Using your own tools is the best way to see what works and what doesn't.

2026-04-02 18:09:13 UTC

Hearth aka the Scala unified macro for 2.13 and 3 has a new version out! 🎉
I'm definitely no macro expert, so go read the changelog yourself to see all the magic. 🪄 It's huge!
https://github.com/kubuszok/hearth/releases/tag/0.3.0 #scala

2026-04-01 10:23:56 UTC

Scala language is yet again setting the standard that other languages will inevitably steal in 5 years! From now on, it goes AI-only, forbidding human-written code at all!
The future is here, and it doesn't need our egos holding back the compiler! 🤖🧠
https://contributors.scala-lang.org/t/new-policy-for-contributing-to-the-scala-language/7428

2026-04-01 09:06:57 UTC

A new, code-first Protobuf library for Scala! Think of it as a Tapir for gRPC services. 👌
Read the full article from Pierre Ricadat to learn why he built it and the benefits it brings. 👇
https://blog.pierre-ricadat.com/protobuf-goes-scala-first/ #scala

2026-03-31 17:22:49 UTC

Scala 3.8.3 is out 🎉 Besides the ported optimizer, it features a local on/off coverage switch. 🔄 https://github.com/scala/scala3/releases/tag/3.8.3 #scala #note1k0l…s9pj

2026-03-31 14:45:09 UTC

A nasty vulnerability was found in sbt! ⚠️ Specifically, a command injection flaw affecting Windows users when resolving source dependencies.
The good news is that it's already fixed. If you build on Windows, make sure to update your project to sbt 1.12.8 or sbt 2.0.0-RC10 immediately.
https://www.scala-lang.org/blog/2026/03/31/sbt-security-advisory.html
#scala

2026-03-31 07:46:06 UTC

Go check out ZIO Blocks! It's a collection of independent libraries with zero or minimal dependencies. Despite the name, ZIO is not needed to use them. ☝️ https://github.com/zio/zio-blocks #scala

2026-03-30 15:01:31 UTC

The whole Scala ecosystem was mapped! 🗺️ Ok, maybe not the whole, but this roadmap is pretty thorough. Nice to see a clear path that doesn't throw you straight into category theory on day one. Definitely worth a bookmark if you're learning. 🔖 https://roadmap.sh/scala #scala

2026-03-30 08:04:38 UTC

Claude's default method for searching APIs is very inefficient and costly, it usually searches and parses Javadocs or even downloads and extracts JARs. 💰
Cellar lets you instantly query the public API of any Maven JVM dependency right from the terminal. 👇
https://github.com/VirtusLab/cellar #scala

2026-03-27 13:51:39 UTC

Another RC version of sbt 2.0 is out! 🎉 There are several improvements, but I really like to see the run task being non-blocking! 🔀 https://eed3si9n.com/sbt-2.0.0-RC10 #scala

2026-03-26 21:51:58 UTC

Scala Days is returning to Berlin after several years! 🇩🇪 If you want to support your favorite language, go grab a ticket for the lowest price available right now. (Fair warning, it still isn't exactly cheap 🤷)
https://www.scala-lang.org/blog/2026/03/26/scala-days-2026.html #scala

2026-03-26 15:19:14 UTC

Mirrors are garbage. That's the core message from Kalin Rudnicki's talk at Func Prog Sweden! #scala
https://www.youtube.com/watch?v=ffzWhyS3Ovg

2026-03-25 16:26:02 UTC

Compile-time validation in Scala 3 is beautiful. By using inline extension methods, we can throw compiler errors for invalid data before the code even runs. #scala https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/8511b68bfec88d046705404650689eed1fc05b4fec35ac6055c24445536bed9a.webp

2026-03-24 17:01:57 UTC

Kotlin Native looks very promising! See how it stacks up against Scala Native 👇 https://marioarias.hashnode.dev/comparing-programming-languages-xii-the-native-showdown #scala #kotlin

2026-03-24 06:44:36 UTC

The Scala 2 optimizer has been ported to Scala 3, starting in version 3.8.3-RC3. It's bringing 10-30% faster execution for high-level functional code using smart inlining 🧠 https://www.scala-lang.org/blog/2026/03/23/porting-the-optimizer.html #scala

2026-03-23 16:06:27 UTC

Scala Native + Tapir + htmx. The ultimate combo! ❤️

2026-03-20 14:51:52 UTC

The Scala compiler doesn't type-check Chuck Norris's code. Chuck Norris type-checks the compiler. #scala

2026-03-19 19:43:22 UTC

Who gets excited about a logging framework? You will when you see these benchmarks. 👇
Scribe gives you detailed method and line number logging with absolute zero runtime cost. How?
It uses Scala macros to bake the info in at compile time. Plus, it brings that pure speed to the JVM, Scala.js, and Scala Native! 🚀
It is completely worth spending a few minutes today to rip out your existing logging library and replace it with this! 💎 #scala
https://github.com/outr/scribe https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/6f345b2bd5c8c6baf522e503a645cf961618244797bd18df894ba19a690714ab.webp

2026-03-17 17:42:23 UTC

Scalex looks like a "new" mini language server designed to provide context to LLMs for better searching. Looks interesting, has anyone tried it yet? It feels like there is a huge overlap with Metals 2.
https://github.com/nguyenyou/scalex #scala

2026-03-17 09:44:39 UTC

Another piece of the puzzle has been updated to Scala Native 0.5, this time it's fs2! 🎉
Now let's wait for http4s, skunk and weaver to join the party! ⌛
https://github.com/typelevel/fs2/releases/tag/v3.13.0 #scala

2026-03-16 08:42:31 UTC

I'm currently working on a tiny library and the truth is, that at least 90 % of the code are bridges to a different json codecs and db backends. And I haven't even started with the ZIO interop 🤷
I also don't want to have a full-fledged effect system baked in the standard library, but just imagine the developer experience if cats-effect and ZIO shared a single, unified API!
https://medium.com/@w.pitula/rage-against-the-plurality-of-effect-systems-c0b3b0be0f69 #scala

2026-03-11 14:32:14 UTC

Scoverage is one of the first plugins I add to any new project. The compiler team finally did the same and found some breakages - but they're already fixing them! 👏 Hopeful that Scoverage in Scala 3 hits full parity with Scala 2 very soon.🤞 #scala https://scala-lang.org/blog/2026/03/11/scoverage.html

2026-03-10 12:26:50 UTC

I'm trying to implement Noel Welsh's better encoding, but I'm not sure if it's suitable for such a small library. Also, I honestly don't think I fully understand it! 😀 I would appreciate any comments or feedback. 🙏 #scala https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/8a38de5d67b40c331ae249962fdfde5c53fa6ffe43909d78d0bfa81b3538eb86.webp

2026-03-09 18:53:54 UTC

http4s is a backbone for many mission-critical systems. I'm pleased to share that "Pure functional HTTP APIs in #Scala" by Jens Grassel is free once again, and this time it's for good! 📖
It's a fantastic resource for anyone looking to build robust, battle-tested web backends.
https://leanpub.com/pfhais

2026-03-09 09:21:20 UTC

I used to think LLMs would make #Python and other mainstream languages dominate forever. But if AI is writing the code, you don't need a language just because it's easy for beginners or hiring. You don't even need to fear refactoring anymore.
What you really need is a language that catches the AI's mistakes. You need strong compilers and strict types (like #Rust or #Scala) to act as safety nets when the AI messes up.
This article changed my perspective 👇
https://alexn.org/blog/2026/03/05/boring-tech-irrelevant/

2026-03-08 22:29:14 UTC

Cats Effect v3.7.0 is officially here! 🎉 We've been waiting since the RC dropped back in July 2025 and it finally brings what we wanted: support for Scala Native 0.5. 🚀
What does that mean? Full multithreading on LLVM! ⚡️
The changelog is absolutely massive, go read it for yourself 👇
https://github.com/typelevel/cats-effect/releases/tag/v3.7.0 #scala

2026-03-07 19:33:37 UTC

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https://typelevel.org/blog/charity.html

2026-03-07 19:33:37 UTC

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In short:
✅ Donations are now tax-deductible in the US & Europe
✅ Zero tax paid on raised funds
✅ Free tools (saving thousands on GitHub alone)
✅ Access to major institutional grants

2026-03-07 19:33:28 UTC

The @Typelevel Foundation is officially a public charity! Why should we care about their tax status? 🤔
Because it means way more resources for functional programming and way less overhead! 📉 #scala

2026-03-06 09:49:50 UTC

Custom skills for Claude and Copilot put together by Alexandru Nedelcu. They explicitly teach the agent how to handle Cats Effect IO, MTL typed errors, and proper Resource lifecycles. 👇 #scala https://github.com/alexandru/skills

2026-03-04 15:05:41 UTC

The milestone v1.0.0 release of the zio-spark wrapper has landed! 🎉 Featuring a major migration to Spark 4. https://github.com/guizmaii-opensource/zio-spark #scala

2026-03-04 06:20:24 UTC

Hey FP enthusiasts, if you don't have plans for June 15–18, you have two options:
1️⃣ You can be my emotional support when my second son is born 👶, or
2️⃣ you can visit Elm Camp in one of the most beautiful cities in Czechia 🇨🇿
https://elm.camp/ #elm

2026-03-03 19:35:45 UTC

Metals just dropped the standalone MCP server! 🚀 #scala
Not opening an editor is becoming a standard these days. If you live in the terminal, your DX just got significantly better!
This release also brings some highly pragmatic quality-of-life updates:
✅ Explain feature - access detailed errors on the fly without touching your build definition
✅ Shut down Bloop directly - no more zombie processes
✅ Twirl templates - proper support for the Play Framework
Check out the full release here: 👇
http://scalameta.org/metals/blog/2026/03/03/osmium/

2026-03-03 09:21:47 UTC

I shared this awesome library called layoutz a few months back... The newest version just added Scala.js and Native support! 🚀 #scala https://blossom.primal.net/8955050e5d6556417dd7a7cad62cfee82fa92141335fa95dc2ae683f8d808847.gif

2026-03-02 14:55:16 UTC

☝️Migrating to sbt 2 is going to be the biggest challenge this year in the Scala ecosystem.
Major build tool bumps are historically brutal, but luckily, you don't need to rely entirely on LLMs to rewrite your sbt plugins.
💡You can use this new sbt2-compat plugin to help with the breaking changes and cross-version publishing.
https://www.scala-lang.org/blog/2026/03/02/sbt2-compat.html #scala

2026-03-02 09:17:56 UTC

This article asks the hard questions about when data science teams should stop pretending and just write Scala.
Worth a read if your data pipelines are outgrowing simple scripts. At what scale do you make the switch? 🤔
https://www.scalateams.com/blog/scala-program-used-for-data-science #scala

2026-03-01 07:44:38 UTC

📖 A new book by Noel Welsh is in the making. Read a preview about the approaches to dependency injection in FP and OOP to fully understand the connection between them. 👇 https://buttondown.com/functionalprogrammingstrategies/archive/dualities-in-dependency-injection/ #scala #functionalprogramming

2026-02-25 19:31:34 UTC

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Here is the base64 version, but you can always just save it as an image: https://github.com/matejcerny/sbt-config/blob/b4abb50e52374ca12f52ee208be2d63a4affbde8/README.md?plain=1#L6

2026-02-24 19:08:23 UTC

The stabilization milestone in form of Scala 3.8.2 is officially out. 🚀 Are you already running the 3.8 branch in production, or have you been waiting until the edges smooth out? #scala

2026-02-24 16:09:39 UTC

Please take a few minutes to fill this out 🙏 so we can get some hard data on how the ecosystem has actually evolved since the last survey, especially regarding real-world Scala 3 adoption. #scala https://virtuslab.typeform.com/ScalaSurvey2026

2026-02-24 16:09:03 UTC

2026-02-24 16:08:47 UTC

2026-02-24 16:07:23 UTC

2026-02-23 21:41:35 UTC

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Go and steal the setup for your own projects 👇 https://github.com/matejcerny/sbt-config

2026-02-23 21:36:42 UTC

So I tried the new Scaladoc static site generator... The verdict: mdoc is dead ☠️
Zero TypeScript or Node boilerplate. Unlike modern JS-heavy generators, you don't need a local dev server just to see a preview. You can literally open index.html right from your file system and almost everything works. (Except the search, of course.) #scala https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/c06efd9ee443397b530ebf88e0f2344cfa145f18572982b7f250a6510d8a227a.webp

2026-02-23 21:35:55 UTC

So I tried the new Scaladoc static site generator... The verdict: mdoc is dead ☠️
Zero TypeScript or Node boilerplate. Unlike modern JS-heavy generators, you don't need a local dev server just to see a preview. You can literally open index.html right from your file system and almost everything works. (Except the search, of course.) #scala https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/98c3831d2d1c46ac0f3784b4dd662126956bc60020b7de46be9ecaf14445dd9f.webp

2026-02-22 17:24:34 UTC

We love to complain about the Scala 2 -> 3 migration.
But let's be real: an older compiler (2.13) natively consuming libraries from a newer one (3.x) for 5 years is pure engineering witchcraft. 🪄
What other language ecosystem even attempts a migration strategy this ambitious?
🚨 With Scala 3.8, this forward compatibility is officially ending. Don't panic, though.
✅ Backward compatibility remains rock solid - Scala 3 still happily consumes your existing 2.13 jars.
Read the wrap-up here 👇 https://www.scala-lang.org/blog/state-of-tasty-reader.html #scala

2026-02-19 15:49:38 UTC

Regarding the new ScalaDoc... did you know you can build an entire website with it? 🌐
You can even publish blog posts! It's incredibly convenient to have your API references right alongside your main site content and tutorials.
Is anyone using this for their projects already? Let me know in the comments! 🙏 #scala

2026-02-17 17:25:24 UTC

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https://contributors.scala-lang.org/t/towards-a-common-scala-style-recommendation/7383/43

2026-02-17 17:24:18 UTC

Reading the Scala style thread... My opinion (echoing others) is that this "hybrid" recommendation is weak.
I would personally go 100% indentation-based so I don't have to think about which style to use in which case.
But what bothers me more is that the current state allows for weird mixes (see image).
We should "fix" cases where indentation isn't strictly required - like for-comprehensions and if statements. Make it strict everywhere.
(scalafix can handle the migration) #scala https://blossom.primal.net/5cae35d562efedb175647aefad3a615670c37b3ff4e21865ecf080c550cec925.png

2026-02-16 16:52:15 UTC

I've mentioned how Java is catching up to Scala multiple times now.
This video perfectly summarizes the recent progress - from null-restricted types to value classes and beyond. 👇 #java
https://www.youtube.com/watch?v=UuQQVY9jxSs

2026-02-16 15:21:10 UTC

💡 If you want to quickly visualize your git history, check out Serie.
It's a lightning-fast TUI built in Rust 🦀 that supports basic Vim motions out of the box. #git #vim https://blossom.primal.net/e3e994ef08f0a35b8b39da2a2584506c166cfce90c0c413cb395439164e18128.gif

2026-02-16 15:18:20 UTC

💡 If you want to quickly visualize your git history, check out Serie.
It's a lightning-fast TUI built in Rust 🦀 that supports basic Vim motions out of the box. #git #vim https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/984c9737a4ce0248fbcb2347cacbf51eba564036c2ec9e345a79d9d0df0aa123.webp

2026-02-15 09:36:37 UTC

💡 Did you know that in Scala 3, ScalaDoc supports Markdown by default? #scala https://www.youtube.com/watch?v=F9sRuC1QWWo

2026-02-13 11:20:55 UTC

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. https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/0125613af3d29e5dee8fa15f14aba7b86053a86d7b5ad92be30e8ce3cd2575b4.webp

2026-02-10 21:41:57 UTC

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. https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/368908f4a7bac0929721900e97999c80eba1fbc66bbc6dd5d65ec0a7c1812fb2.webp

2026-02-05 12:15:10 UTC

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.
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. #scala https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/5e5f17247a322872ab51e2899fc88161393e82b3e2e94a225986e8dc396e8fa5.webp

2026-02-03 17:16:39 UTC

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

2026-02-03 17:14:24 UTC

Finally... a sane way to work with Jira! #Claude https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/b06c7bf23ab6f92a6e0aa9f36b147bb87a5da1ae0f28572f27e6f4a4cf13a616.webp

2026-02-02 07:12:48 UTC

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

2026-02-02 07:09:49 UTC

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 https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/b15afc24de74f53d4b65a4c2195cbbfb40eb6d249438b49786074d8830ce1743.mp4

2026-01-30 19:42:12 UTC

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
https://www.scala-lang.org/blog/post-mortem-3.8.0.html

2026-01-28 09:35:28 UTC

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

2026-01-27 16:22:36 UTC

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!
https://www.scala-lang.org/blog/2026/01/27/sta-invests-in-scala.html #scala

2026-01-27 09:10:18 UTC

"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. 🎯
Check out the new Forms4s library by @Krever01. It ships with Tyrian 👾 support out of the box, but because it's composable, you aren't locked into a specific UI framework.
https://medium.com/business4s-blog/forms4s-rapid-internal-ui-development-18f1a6ec1cb0 #scala

2026-01-27 09:07:02 UTC

2026-01-26 07:44:19 UTC

💡 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! ❤️
https://youtu.be/aghxkpyRVDY

2026-01-25 18:03:22 UTC

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: https://www.meetup.com/functional-jvm-meetup/events/312917192/
#Scala

2026-01-25 00:17:03 UTC

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

2026-01-23 07:37:07 UTC

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? https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/945989f4494329dd781744fb17b06d5415a830b2a1ea6b12a4f27d589d501125.webp

2026-01-22 15:55:04 UTC

Now it's official! 🎉 Go read the whole announcement 👇
https://www.scala-lang.org/news/3.8/ #scala

2026-01-22 10:46:00 UTC

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

2026-01-21 16:52:41 UTC

🚨 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 👇
https://github.com/typelevel/scalac-options/pull/225 #scala

2026-01-20 12:28:13 UTC

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

2026-01-20 12:21:01 UTC

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 https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/db304bde9abab3f9c41a4d45710f702a4f603e8df6b6ab783d41e9ea2b5111b2.webp

2026-01-20 08:42:25 UTC

Java doesn't support Higher Kinded Types.
But with enough determination, boilerplate and type gymnastics, you can technically emulate them. 🤸‍♂️
#Java #Scala
https://blog.scottlogic.com/2025/04/11/higher-kinded-types-with-java-and-scala.html

2026-01-18 18:26:37 UTC

Typeclasses in Java are taking shape! 🏗️ The first experiments have been merged, moving this from theory to reality! #java https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/7873bfb21869ce9c39f3045b675346a8e6277d5db247ff463b8bc919d562c076.webp

2026-01-17 07:26:49 UTC

Arguably the best resource for learning how to structure production-grade applications with Cats Effect and Fs2 is now completely free! 📖 Huge contribution to the community by Gabriel Volpe 🙌 #Scala
https://leanpub.com/pfp-scala

2026-01-16 09:14:43 UTC

This feature in Scala 3.8 is so experimental that it doesn't even have a SIP yet! 😀 I hope I don't need to explain the code, but be warned: exhaustivity checking is currently broken for this 👇 #Scala https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/f223e0357ab35f7553259846d975b21445b0089a7691a02504605aa780a57653.webp

2026-01-14 17:00:03 UTC

The last missing piece? 🧩 @Zed is finishing up a native Git Graph and it looks incredible! 🤩 https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/bbdd5d4469b2e7eaf2055a91a78456aa398f07957642ecac90034ae46ed7d51a.webp

2026-01-12 15:16:59 UTC

Next on the list of Scala 3.8 experimental features: Flexible Varargs. Until now, passing multiple collections to a varargs method required manual concatenation. With this change, you can mix multiple splices and single arguments freely ✨#scala https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/8a652485c9ec84dc5415b271ad96f8b4d7b2dca21ab095ca51d56ee661139a91.webp

2026-01-12 08:36:35 UTC

How to access method default parameters via macro? 🧐
Pretty niche topic, but after reading you will learn:
✅ How some JVM internals work
✅ What the Selectable trait is
✅ About the transparent keyword
https://halotukozak.github.io/posts/scala-macro-defaults/ https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/f240b27e911e33ab4610bf2ed5a8d7ad549bb26c261d4a79d4597614c8670e4b.webp

2026-01-09 12:50:08 UTC

I've started working on a project in Go - who would have expected that? 🤷 I'm treating it as a personal challenge. Sometimes you have to lose something to understand its value. #golang #scala

2026-01-08 17:00:54 UTC

Scala 3.8 will bring several experimental features. One of them is the relaxed lambda syntax, where you don't need to put a newline after the colon. Haters of the braceless syntax will hate it even more! 😀 #scala https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/ad38d06285b9ffe4dde8fb2f7452dec525b57742c0639bb8f0eb889ee7cd5476.webp

2026-01-07 13:26:42 UTC

Hey, Java devs! If you're on JDK 17+, it's time to start using Sealed Classes to eliminate invalid states. On JDK 21+, combine them with Pattern Matching for a truly powerful result. The difference in conciseness and safety is incredible! 🚀 #java https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/1110aacc2254c7f7ec121c642eef317730eaffa3aa76f14ee98c4ffa72424514.webp https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/be596a8ecfc980f91e83986f64a6f3192fbc029bd08548d40b21358169b88881.webp

2026-01-06 19:45:46 UTC

This is a follow-up to the previous article about builder type gymnastics. This time, all the boilerplate code is hidden behind the macro. Sadly, under the Scala 2 macro 😐 #scala https://blog.rhetoricalmusings.com/posts/builder-macro/

2026-01-05 21:47:53 UTC

I played around with the new procedural SQL in Spark 4. It's wild. I like it. You'll probably hate it! 😀 #spark https://matejcerny.cz/en/apache-spark-procedural-sql/

2026-01-05 08:43:40 UTC

The SBT plugin absolutely no one asked for... but I built it anyway. 🤷‍♂️ You can now use HOCON files for your build configuration. It’s surprisingly clean. I’d love to hear your opinions 🙏 #scala https://github.com/matejcerny/sbt-config

2026-01-04 22:36:59 UTC

Apache Spark 4.1 is officially here and it's a massive release! 🔥
1️⃣ TIME WITH TIME ZONE: finally, proper timezone support! 🕒
2️⃣ WITH RECURSIVE: native support for recursive CTEs in SQL. 🔄
3️⃣ Real-Time Mode: sub-second latency (<300ms) for streaming. ⚡
4️⃣ Declarative Pipelines: define ETL state, let Spark handle the execution. 🏗️
5️⃣ Pythonization: native Python data sources, remapped JVM exceptions etc. 🐍

2026-01-03 07:14:04 UTC

Did you know there’s a Functional Programming course you can download right into IntelliJ? It includes 8 lessons and 40 challenges on everything from Immutability to Monads. 🧠 #scala https://cdn.nostrcheck.me/f5c3f597f754f534d47b0be2b9afe263894ecdad3d639453c4abc31f40db2c23/1ec98d9c7076577b460bde7fab41692b8e1a7a506fa1bfc10849b5ed4a9c4ada.webp

2026-01-03 07:14:04 UTC

- reply

https://plugins.jetbrains.com/plugin/23833-functional-programming-in-scala

2026-01-02 14:42:18 UTC

Anyone who has ever implemented AWS request signing manually will be pleased to know there is an http4s module for it 👇 #scala
https://github.com/maginepro/http4s-aws

2026-01-02 07:30:55 UTC

Great news, the latest IntelliJ Scala plugin update officially brings support for the upcoming Scala 3.8! #scala https://plugins.jetbrains.com/plugin/1347-scala/versions/stable/918481

2025-12-31 15:09:28 UTC

Another year of new habits and milestones. Here are the highlights that stand out:
1️⃣ Started a new chapter working for SiriusXM 📻
2️⃣ Continued sharing my passion for tech, (re)posting over 400 articles, videos and tips 💡
3️⃣ Switched to an electric vehicle ⚡
4️⃣ Started with cold showers - the positive impact is huge! 🚿
5️⃣ Unlocked a core memory: witnessing my son truly experience the sea for the first time 🌊👶
6️⃣ Read 10 books, switching completely to English even for novels 📚
7️⃣ Walked and hiked a total of 970 km, including a 52.5 km in a single activity 🥾⛰️
8️⃣ Completed 41 strength training sessions, 43 climbing sessions and 24 runs 🏋️‍♂️🧗🏃
9️⃣ Didn't make much progress on the accordion 🪗

2025-12-30 16:37:15 UTC

- reply

https://github.com/rcardin/yaes

2025-12-30 16:37:11 UTC

Another effect system? 🙄 I usually avoid sharing these because I hate fragmentation and this one is still experimental. However, λÆS deserves a look. It implements a unique direct style approach, and the progress is impressive. 🚀 (Also, there is a cats-effect integration!) #scala https://www.youtube.com/watch?v=3b5WeB-zpeE