This week in #Scala (Jun 16, 2025)

Welcome to the new edition of #ThisWeekInScala!

This blog keeps you updated with the latest Scala and Reactive programming news.

New Content

• Jonas Bonér on Akka, Distributed Systems, Open Source and Agentic AI

• Developer Ecosystem Survey 2025

• The Elements of Kyo - Interactively explore the codebase

• Migrating a PlayFramework app to Scala 3

• Suspension: the magic behind composability (or "The Kyo Monad")

• First Make It Correct

• Spark Encoders—a lightweight Scala library for compile-time derivation of Spark org.apache.spark.sql.Encoder

• Quick experimentation vs -Xfatal-warnings flag in Scala/sbt

Events

• Announcing Scala Days 2025 (Lausanne, Switzerland, 19–21 August 2025)

• Software Delivery Excellence in the age of AI: A Fireside Chat, June 26th, Online Event

• Scalator: Stream Composition with Kyo & Community Revival!, Wed, Jul 9, 2025, 6:00 PM, Toronto

• DEVJVM: Call for Speakers

• The Scala Workshop 2025, Singapore

Releases

• etl4s 1.4.1

• Mill 1.0.0-RC1

• Spark 4.0.0

Learning Materials

• Online Courses (MOOCs) from The Scala Center

• Learn Scala with Alvin Alexander

• Functional Programming in Scala JetBrains course

• Scala 3 Metaprogramming Learning Resources

• The Functional Programming in Scala Course Is Out!

• Functional Declarative Design: A Comprehensive Methodology for Statically-Typed Functional Programming Languages

• Get Programming with Scala by Daniela Sfregola (30% off)

• Play for Scala (30% off)

• Grokking Functional Programming (30% off)

• Functional Programming for Mortals (pay as much as you want)

• Essential Effects by Adam Rosien (20% off)

• Programming in Scala, Fifth Edition

• Functional Event-Driven Architecture: Powered by Scala 3 is now 100% complete

• Zionomicon (code is thisweekinscala)

• Supercharge Scala Future | FP-Tower (50% off)