A free, once-weekly Scala news flash. Easy to unsubscribe. Goes out every Thursday.
March 6th, 2025, ISSUE 573

READING

GSOC 2025: Call for contributors

We are thrilled to announce that the Scala Center organization has been accepted for Google Summer of Code 2025!
Scala Center (@scala_lang)
Drawing Heighway’s Dragon - Recursive Function Rewrite

From Imperative Style in Pascal 64 To Functional Style in Scala 3
Philip Schwarz (@philip_schwarz)
From Python to Scala: Rewriting 27k Lines of a CLI

This is the story of sbcontrol, an internal tool created within SwissBorg to facilitate communication with internal APIs (gRPC and Kafka) for operational and testing purposes.
Voytek Pituła (@Krever01)
JDK 17 will be the next minimum version required by Scala 3

Scala 3 will require JDK 17+, starting from Scala 3.8. This will enable the compiler and ecosystem to move faster and leverage new features and APIs.
Tomasz Godzik (@TomekGodzik)
Spotify FOSS Fund 2024

We’re excited to announce that Typelevel has been chosen as a recipient of the 2024 Spotify FOSS Fund! As a result, Spotify has donated €20,000 to Typelevel’s OpenCollective.
Andrew Valencik

EVENTS

Functional World #16, Mar 11th, Online Event

Join a talk by Michał Pawlik: "Scala in 2025: How to Start, What to Learn?"
Functional World
15% discount for Scalar, Mar 27th - 28th, Warsaw, Poland

Join Scalar Conference 2025 and prepare for two exciting days of learning about functional programming with a fantastic community. Use promo code ScalaTimes15 and get a discount!
Scalar Conference (@scalarconf)
London Scala User Group Meetup, Apr 16th, London

Solving Scala's Build Problem with Mill & Mystery talk.
London Scala User Group (@londonscala)
J On the Beach, May 14th - 16th, Málaga, Spain

Use special promo code Sc4l4OTB for Scala Times readers to get 10% discount!
J On The Beach
15% discount for LambdaConf, May 10th - 16th, Estes Park, CO, USA

This year's conference will feature a hand-picked lineup of renowned and new speakers, thought-provoking keynotes, hands-on workshops, hackathons, and panel discussions. Whether you are a seasoned professional or just starting your journey in functional programming and AI, LambdaConf 2025 offers something for everyone.
LambdaConf (@lambda_conf)
CFP for Lambda Days, June 12th-13th, Kraków, Poland

Call for Talks deadline: Feb 9th, don't hesitate! Our event is one of the biggest functional programming conferences in Europe with 2 days packed with inspiring talks, networking opportunities, and, of course, some fun().
LambdaDays (@LambdaDays)
Scala Days 2025 CFP, Aug 19th - 21st, Lausanne, Switzerland

Submit your talk to be part of Scala Days 2025! The Call for Proposals is officially open and will close on April 6th, 2025, at 11:30 pm GMT.
Scala Center (@scala_lang)

VIDEOS

Kyo: A New Approach to Functional Effects in Scala with Flavio Brasil and Adam Hearn

Learn about Kyo, a new functional effect system for Scala! We discuss what effect systems are, their benefits, and how Kyo simplifies functional programming with algebraic effects and a unified monad. Flavio and Adam walk through a live demo showcasing Kyo's type system, effect handling (including environment and error management), and composability. Perfect for anyone interested in functional programming on the JVM
Flavio Brasil and Adam Hearn (@fbrasisil @adamhearn_)

RELEASES

scala-uri 4.2.0

Now with Native 0.5 support.
Anton Sviridov (@velvetbaldmime)
scala-nameof 4.1.0

Get the name of an variable, function, class member, or type as a string--at compile-time!
Derek Wickern





  1. Scala Times Issue #573

    GSOC 2025: Call for contributors. Drawing Heighway’s Dragon - Recursive Function Rewrite. From Python to Scala: Rewriting 27k Lines of a CLI. Spotify FOSS Fund 2024. Functional World #16, Mar 11th, Online Event.


  2. Scala Times Issue #572

    Rock the JVM partners with the Scala Center. Typelevel Summer of Code 2025. Functional World #16, Mar 11th, Online Event. 15% discount for Scalar, Mar 27th - 28th, Warsaw, Poland. London Scala User Group Meetup, Apr 16th, London.


  3. Scala Times Issue #571

    Fast Incremental JVM Assembly Jar Creation with Mill. Calling Scala Native from Java using FFM. Announcing Scala Days 2025, Aug 19th - 21st, Lausanne, Switzerland. Scala In The City, Feb 25th, Hamburg, Germany. Scala in the City, Feb 26th, Berlin, Germany.


  4. Scala Times Issue #572

    Fast Incremental JVM Assembly Jar Creation with Mill. Calling Scala Native from Java using FFM. Announcing Scala Days 2025, Aug 19th - 21st, Lausanne, Switzerland. Scala In The City, Feb 25th, Hamburg, Germany. Scala in the City, Feb 26th, Berlin, Germany.


  5. Scala Times Issue #570

    Scala Highlights from 2024. Rust from a Scala Perspective: Advent of Code 2024. Scalar, Mar 27th - 28th, Warsaw, Poland. J On the Beach, May 14th - 16th, Málaga, Spain. CFP for Lambda Days, June 12th-13th, Kraków, Poland.


  6. Scala Times Issue #569

    Scala Tooling Spree #1 recap. Scala 3 Migration: Report from the Field. Circuit Breaker — Ox 0.x documentation. The joys of messaging without a message bus. Scalar, Mar 27th - 28th 2025, Warsaw, Poland.


  7. Scala Times Issue #568

    GSoC 2025: Call for Scala projects. Next Scala 3 LTS series will increase minimum required JDK version. Pre-SIP: A Syntax for Collection Literals. Scala Macros and Metaprogramming course. Scalar, Mar 27th - 28th 2025, Warsaw, Poland.


  8. Scala Times Issue #567

    Recap of Advent of Code 2024. Running Cask with Virtual Threads. Zio Schema vs Rust Serde. Scalar, Mar 27th - 28th 2025, Warsaw, Poland. CFP for Lambda Days, June 12th-13th 2025, Kraków, Poland.


  9. Scala Times Issue #566

    Random Scala Tip #568: Beware of Leaking Iterators. Announcing ScalaMock 7. Functional Programming In Scala, Jan 25th, Online Event. Scalar, Mar 27th - 28th 2025, Warsaw, Poland. CFP for Lambda Days, June 12th-13th 2025, Kraków, Poland.


  10. Scala Times Issue #565

    Random Scala Tip #697: Avoid Anonymous Functions as Dependencies. Scalar, Mar 27th - 28th 2025, Warsaw, Poland. CFP for Lambda Days, June 12th-13th 2025, Kraków, Poland. IntelliJ IDEA x Scala - Enums Support.


  11. Scala Times Issue #564

    Google Summer of Code 2024 - Going Feral on The Cloud. Rant on Scala3 tooling (IntelliJ/metals). Scalar, Mar 27th - 28th 2025, Warsaw, Poland. CFP for Lambda Days, June 12th-13th 2025, Kraków, Poland. Where Are the Scala Frameworks? .


  12. Scala Times Issue #563

    Rust vs Scala: Facts and Hype. The IntelliJ Scala Plugin in 2024. Technical Note: Using Circe with java.net.http. Faster CI with Selective Testing. Gems in the Scala Ecosystem.


  13. Scala Times Issue #562

    What Scala has to offer for Java devs. Purify Your Tests Episode IV: The Monoids Strike Back. Scala 2 maintenance plans. Scalar, Mar 27th - 28th 2025, Warsaw, Poland. CFP for Lambda Days, June 12th-13th 2025, Kraków, Poland.


  14. Scala Times Issue #561

    Scala's Hidden Treasures: Five ZIO-Compatible Libraries you didn't know you needed!. A succinct early exit trick for Option in Scala. Integrate JobRunr into Play Framework. Relative simple and small type-driven dependency injection. Scala Space in 2025 .


  15. Scala Times Issue #560

    Free Develocity Build Scans. Pragmatic Type-Level Design. Join us for the Advent of Code 2024. Zio-kafka, faster than java-kafka. Debugging a Scala Compilation Issue, a journey into Variance and LUB.


  16. Scala Times Issue #559

    Last bounties to collect for tapir and sttp. Mill $1000 bounty: Use Scala-Native for Mill Client. Free Develocity Build Scans. 10% discount for Scala Times readers for Functional Scala conference!. Scalar, Mar 27th - 28th 2025, Warsaw, Poland.


  17. Scala Times Issue #558

    New Module Layout for sbt Projects. How I SBT - V. Zionomicon for ZIO 2.1 (free ebook). 10% discount for Scala Times readers for Functional Scala conference!. Scalar, Mar 27th - 28th 2025, Warsaw, Poland.


  18. Scala Times Issue #557

    What is Functional Programming?. Announcing Akka 3. Idiomatic dependency injection for ZIO applications in Scala. ZIO in 2025. Upcoming Changes to Givens in Scala 3.7.


  19. Scala Times Issue #556

    Benchmark results: jsoniter-scala vs simdjson-java . Scalar 2025 extends call for papers!. Scala.IO, Nov 7th-8th, Paris. Functional Scala CFP, Dec 5th, online event. 10% discount for Scala Times readers for Functional Scala conference!.


  20. Scala Times Issue #555

    (In)Validating Library Design. Postmortem of Scala 3.6.0. How to implement LETS on ChainCash. Scalar 2025 extends call for papers!. Scala.IO, Nov 7th-8th, Paris.


  21. Scala Times Issue #554

    SoftwareMill Open Source Bounties. Scala: a mature open-source project. Folding Cheat Sheet #8 - Folding with Monoids . Simple Contract-First Applications. Scalar 2025 extends call for papers!.


  22. Scala Times Issue #553

    Direct-style concurrent streaming. Open com-lihaoyi issue bounties. Scala Project Maintenance Survey. Scalar 2025 extends call for papers!. Scala.IO, Nov 7th-8th, Paris.


  23. Scala Times Issue #552

    Optimal Scalafmt configuration using Genetic Algorithms. Cancellable HTTP requests via Scala's Tapir. Game of Life with Scala.js and Webassembly. Scala without effect systems. The Martin Odersky way.. Scalar 2025 Early Birds!.


  24. Scala Times Issue #551

    Functional Programming in Scala - Edu Plugin. Inline your boilerplate - harnessing Scala 3 metaprogramming without macros. Scalar 2025 Early Birds!. Lambda World, Oct 2nd - 4th, Cadiz, Spain. Art of Scala, Oct 10th, Warsaw, Poland.


Organizing an event?
Promote it with
Scala Times.
The Scala Times reader?
Get a banner!
Got a tip?Send it in!
Follow us onTwitter.
Curated by SoftwareMill.
We are hiring.
And taking on projects.