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 👇

GitHub

Release v3.7.0 · typelevel/cats-effect

This is the fifty-ninth release in the Cats Effect 3.x lineage. It is fully binary compatible with every 3.x release and fully source-compatible wi...

#scala

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

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

GitHub

GitHub - alexandru/skills

Contribute to alexandru/skills development by creating an account on GitHub.

The milestone v1.0.0 release of the zio-spark wrapper has landed! 🎉 Featuring a major migration to Spark 4.

GitHub

GitHub - guizmaii-opensource/zio-spark: A functional wrapper around Spark to make it works with ZIO

A functional wrapper around Spark to make it works with ZIO - guizmaii-opensource/zio-spark

#scala

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 🇨🇿

Elm Camp

An Elm unconference taking place at Park Hotel Prachárna, Olomouc, Czechia. Mon 15th - Thur 18th June

#elm

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: 👇

Metals v1.6.6 - Osmium | Metals

I shared this awesome library called layoutz a few months back... The newest version just added Scala.js and Native support! 🚀 #scala

☝️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.

Migrating sbt plugins to sbt 2 with sbt2-compat plugin

A case study of how sbt-assembly uses sbt2-compat to cross-build for sbt 1 and sbt 2, and a guide of how to use it for your own plugins.

#scala

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? 🤔

Scala Teams

How Is Scala Used for Data Science — Scala Teams

Wondering how Scala is used for data science? Learn how Apache Spark, MLlib, Breeze, Smile, and other Scala libraries compare for analytics, machin...

#scala

📖 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. 👇

Dualities in Dependency Injection

Hello! Last email I announced early access sales for the book. I'm both surprised and delighted that so many of you went and purchased a copy. Than...

#scala #functionalprogramming

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

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

Scala Survey 2026

Turn data collection into an experience with Typeform. Create beautiful online forms, surveys, quizzes, and so much more. Try it for FREE.

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

Scala Survey 2026

Turn data collection into an experience with Typeform. Create beautiful online forms, surveys, quizzes, and so much more. Try it for FREE.

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

Scala Survey 2026

Turn data collection into an experience with Typeform. Create beautiful online forms, surveys, quizzes, and so much more. Try it for FREE.

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

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

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 👇

State of the TASTy reader and Scala 2.13 ↔ Scala 3 compatibility

#scala

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

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

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