matejcerny 4 months ago

"Better-fors" are leaving preview with the release of Scala 3.8. It looks like a small DX upgrade, but under the hood, the desugaring is a lot simpler, skipping redundant `.map` calls. See the official documentation. #scala

redirect

matejcerny 4 months ago

Apparently, there was an experiment called "Lasca" which tried to shift #Scala more towards #Haskell. Based on the readme, it was planned to feature full type inference and be LLVM based. Funnily enough, in Czech 🇨🇿 the name means "Love" ♥️

GitHub

GitHub - nau/lasca-compiler: Lasca is Scala shifted towards Haskell.

Lasca is Scala shifted towards Haskell. Contribute to nau/lasca-compiler development by creating an account on GitHub.

matejcerny 4 months ago

Quick clarification☝️Just because Scala itself targets JDK 8 doesn't mean your app has to! You're free to use any JDK 8 or newer. Scala 3.8 will raise the minimum required JDK to 17, but you'll still be able to use the latest JDKs (21, 25, etc.) for your own projects. #scala #jdk View quoted note →

matejcerny 4 months ago

Let's look at four possibilities that JDK 17 adoption could unlock for the upcoming #Scala versions. 🧵

matejcerny 4 months ago

With #Scala 3.8 around the corner, let's recap its biggest changes: 1️⃣ JDK 17 as a minimum version 2️⃣ "Better fors" (SIP-62) 3️⃣ Standard library built with Scala 3

matejcerny 4 months ago

The biggest improvements in #Scala 3 are not enums or nicer implicits syntax, but: 🤝 Making binary compatibility across versions possible (via TASTy) ⚡ A built-in interactive compiler (instead of a batch tool) 🔗 A modular architecture that makes new features easier to add

matejcerny 4 months ago

🎉 Scala 3.7.4 is officially out, bringing several fixes and backports. See the full changelog 👇 #scala

GitHub

Release 3.7.4 · scala/scala3

Highlights of the release Bump Scala CLI to v1.9.1 (was v1.9.0) #23962 Make coverage more similar to the one in Scala 2 #23722 Deprecations for r...

matejcerny 4 months ago

Streams are a powerful tool for control flow, covering topics such as event handling, file processing, reading from the database... Learn more from Zainab Ali's talk at the London Scala User Group. #scala

matejcerny 4 months ago

Please share so my boss Michal is happy! 😂 Or to spread the word about VirtusLab / SoftwareMill's new podcast! 📢 Or to support local #Scala agencies! 💪

matejcerny 4 months ago

There are so many great thoughts, to pinpoint just a few: 1️⃣ Tooling is nowhere near other languages 2️⃣ Missing a true "Spring Boot-like" framework 3️⃣ Official docs need real-world examples 4️⃣ The persistent misconception that "you need async for performance" #scala

matejcerny 4 months ago

This is probably the most complete tutorial on typeclasses in Scala 3, it's basically a short book. Bookmark it, as it has everything: givens, derivation, mirrors, inline defs, macros... you name it. #scala https://kubuszok.com//2025/sanely-automatic-derivation/

matejcerny 4 months ago

After years, I came to the same conclusion: it's worth taking the time to use proper test data, even for attributes you don't currently use in your business logic. It'll save you so much time later. https://etorreborre.blog/dont-look-down-look-at-the-data-instead

matejcerny 4 months ago

Scala vs. F#: Which is more functional? #scala #fsharp

Alexandru Nedelcu

Scala vs F#

Which language leans more towards functional programming? In this binary choice, people have perceived F# to be that language, due to its ML roots,...

matejcerny 4 months ago

The tech industry is creating its own talent crisis. By ditching junior devs for AI hype, companies are just burning out their seniors and killing the future talent pipeline. #ai

matejcerny 4 months ago

Binary compatibility is a very important topic that every senior should understand. This video, even though it's about Smithy4s, explains concepts for evolving a library's schema in a binary-compatible way. #scala

matejcerny 5 months ago

The most comprehensive collection of Scala learning material finally on YouTube. A freaking 283 videos! #scala https://www.youtube.com/@Ziverge/playlists

matejcerny 5 months ago

Respect to Dylan Halperin for his massive contribution to @http4s! 🚀 His new MultipartReceiver is in the latest version after over a year of review, adding safer, fail-fast file uploads with size limits and no buffering. #scala

GitHub

Release v0.23.33 · http4s/http4s

What's Changed http4s-core fix: proxy authorization header instantiation with basic credentials by @tpetillot in #7742 Introduce MultipartReceiver...

matejcerny 5 months ago

I was really looking forward to io_uring in Postgres 18, but it turns out it's not the winning I/O strategy. Worker, the new default, seems to be the best all-around method so far, performing well on all storage types. #postgres

Benchmarking Postgres 17 vs 18 — PlanetScale

Postgres 18 brings a significant improvement to read performance via async I/O and I/O worker threads. Here we compare its performance to Postgres 17.

matejcerny 5 months ago

Java is removing sun.misc.Unsafe, an API which is widely used but was never supported or meant to be public. This is one of the reasons for the adoption of JDK 17 in the upcoming version of Scala, which relies on Unsafe for its lazy val implementation. #java #scala

matejcerny 5 months ago

💡 Quick tip: Stop parsing Array[String], use @main and get type-safe command-line args directly as function parameters. #scala