A free, once-weekly Scala news flash. Easy to unsubscribe. Goes out every Thursday.
May 14th, 2021, Special Scala 3 issue


Release 3.0.0

Scala 3.0.0 FINAL is here! After years of development, the project that was once known as Dotty, is now available. The ecosystem is pushing full steam ahead as we speak, releasing all the libraries that we know and love from Scala 2, so that you could start experimenting and developing using all of the goodies that come with the new release.

We're taking this occasion to release a special issue, with some Scala-3-related links from previous ScalaTimes issues, introducing new features or detailing out migration paths. Keep in mind this is only the tip of the iceberg, you can find much more in ScalaTimes archives!

Congratulations to Martin Odersky, Nicolas Stucki, Guillaume Martres and the rest of the EPFL & ScalaCenter teams!

The Scala Team (@scala_lang)
Scala 3

The best place to start your adventure with Scala 3 / Dotty: extensive documentation, migration information, download links.
Scala Team (@scala_lang)
Starting with Scala

How to start with Scala? What IDEs are available? Which books to read, and which blogs to follow? Your one-place-stop if you are starting with Scala.
SoftwareMill (@softwaremill)
Programming in Scala, Fifth Edition

THE Scala book, updated for Scala 3.
Artima, Inc. (@ArtimaInc)
Scala 3 Tech Report

A summary of developers' expectations for Scala 3 and their view on the future of Scala, based on the results of survey that we've conducted among 671 respondents.
SoftwareMill (@softwaremill)
Annoying things in Scala 2 that’ll be (mostly) gone in Scala 3

Scala 2 is great, but occasionally some things are annoying. An introduction to some of the changes in Scala 3.
Mikołaj Koziarkiewicz (@mikolak_net)
Automatically Deriving Typeclass Instances in Scala 3

A lot of work is done by the Scala compiler, and even more work can be done by writing your own typeclass derivation!
Noel Markham (@noelmarkham)
Starting with Scala 3 macros: a short tutorial

Scala 3 brings a whole new metaprogramming experience. How to start writing your own inlines and macros?
Adam Warski (@adamwarski)
Opaque Type Alias

What are Opaque Type Aliases, and how to use them for domain modelling?
Baeldung (@baeldung)
Context is King

What are Scala 3 context functions, and how can we leverage them? How do they play with Dependency Injection?
Adam Warski (@adamwarski)
Scala 3 in sbt 1.5

How to use Scala 3 in SBT?
Adrien Piquerez (@adrienpi2)
Match Types in Scala 3

Introducing one of Scala 3's new features: match types.
Daniel Ciocîrlan (@rockthejvm)


Get more clarity with opaque types

Types are a programmer's best friend. In Scala 3, there's something new for this purpose - opaque type aliases. What do they bring to the table?
Magda Stożek (@magdastozek)
Scala 3 Metaprogramming by Example

Keynote from Functional Scala 2020 - live-coding a couple of metaprogramming examples using Scala 3
Adam Warski (@adamwarski)
Implicits in Scala 3 – Explicitly for the People?

Implicits were the subject of a considerable overhaul of Scala 3. What changed, and is it for the better?
Mikołaj Koziarkiewicz (@mikolak_net)
Why Scala?

A 15-minute introduction: Why Scala?
Adam Warski (@adamwarski)
Scala 3 playlist by RockTheJVM

A lot of video content on what's new in Scala 3!
Daniel Ciocîrlan (@rockthejvm)

  1. Scala Times Issue #396

    Monitoring Akka applications with Mesmer and OpenTelemetry. Building Next Gen Applications on JVM with ZIO. Where the ZIO Roadmap is Headed Next. Announcing Data Times. SBT Tutorial - Part 1.

  2. Scala Times Issue #395

    Akka gRPC benchmarks. Scala 3: What’s Changed Since Scala 3.0.0. ZIO Hackathon, Oct 29th - 31st (CET). ScalaCon, November 2nd - 5th. Functional Scala, Dec 2nd - 3rd.

  3. Scala Times Issue #394

    A Preview of Logging in ZIO 2.0. Number (part 2). Fuzzy, lazy, functional numeric computing in Scala. Advances In The ZIO 2.0 Scheduler. Effective Programming in Scala.

  4. Scala Times Issue #393

    Incorporating Plotly into your Zeppelin notebooks with Spark and Scala. What is F[_] in Scala?. A pure functional Primality Test in Scala. Using oracles to test the service and data layer. ZIO Hackathon, Oct 29th - 31st (CET).

  5. Scala Times Issue #392

    ScalaCache: A Caching Library To Rule Them All. Migrating from IntelliJ IDEA to VSCode and Metals. Announcing Data Times. Building Twitter's backend RPC services with Finagle. ZIO Hackathon, Oct 29th - 31st (CET).

  6. Scala Times Issue #391

    Spark ML hyperparameter tuning. Number (part 1). Announcing Data Times. ZLayer DSL - Getting Started with ZIO in Scala3. ZIO Hackathon, Oct 29th - 31st (CET).

  7. Scala Times Issue #390

    Understanding Comparative Benchmarks. Announcing Scala.js 1.7.0. Announcing Data Times. Why Should You Care About Referential Transparency?. GitHub Copilot for Scala - Does it work?.

  8. Scala Times Issue #389

    An intro to the Scala presentation compiler. From Scala 2 shapeless to Scala 3. IntelliJ Scala Plugin 2021.2. Scastie with Scala 3. Tooling Talks Episode 3 - Justin Kaeser.

  9. Scala Times Issue #388

    Data Times - Big Data and ML enthusiasts news flash. Story of importing a large dataset to Akka Cluster. Combining the terminal (iTerm) with the IDE. Metaprogramming in Scala 3: Inline. Part 6 - zio.Has - Getting Started with ZIO in Scala3.

  10. Scala Times Issue #387

    Will Scala 3 be your new favorite language?. Programming with Functions #8: Monads. Part 5 - ZIO.access - Getting Started with ZIO in Scala3. 12th ACM SIGPLAN Scala Symposium Call for Papers. ZIO Hackathon, Oct 29th - 31st (CET).

  11. Scala Times Issue #386

    Scala 3: Macros. 5 Key Lessons from Functional Programming in Scala. OAuth2 Scala application with sttp-oauth2, part 1 - Dev notes. Scala 3 Tech Report by SoftwareMill. Top Link of June: Scala 3 goodies for Scala 2 developers.

  12. Scala Times Issue #385

    Scala 3 Tech Report. ZIO: Introduction to Fibers. Problem: automatic coloring of effect monads in dotty-cps-async. Scala 3: Anti-Givens. (re)constructing sequences with Alternative.

  13. Scala Times Issue #384

    How to write a fire shader. Scala 3 goodies for Scala 2 developers. Composable Scala Matchers: Introduction. Writing an Interpreter From Scratch. Destroy your foldLeft with traverse and State - Scala tutorial.

  14. Scala Times Issue #383

    Existential Crisis: Implementing MapK in Scala 3 . What is ZIO and should you learn it?. Zymposium, June 18th (PDT). ZIO Hackathon, Oct 29th - 31st (CET). ScalaCon, November 2nd - 5th.

  15. Scala Times Issue #382

    Cats: Essential Type Class Hierarchy, Explained. Debugging and Observing Your Scala Code. Programs as Values, Part III: Explicit Control Flow. Programming in Scala Fifth Edition . Favor composition over inheritance in Scala3 with exports!.

  16. Scala Times Issue #381

    Top Level Exports in Scala3. Death of Blocker: blocking in Cats Effect 3 - Scala tutorial. Functional Scala, Dec 2nd - 3rd.

  17. Scala Times Issue #380

    Scala 3 Hello, world!. Scala 3 macros tips & tricks. Build your own refinement types in Scala 3. How To Implement Streaming Microservices Using ZIO and Kafka. How to successfully manage a ZIO Fiber’s lifecycle.

  18. Scala Times Issue #379

    Scala 3 is here!. New Online Course: Effective Programming in Scala. Image editing with Comonads. Generalized Algebraic Datatypes in Scala 3. Kind Projector Migration.

  19. Scala Times Special Scala 3 Issue

    Starting with Scala. Programming in Scala, Fifth Edition. Scala 3 Tech Report. Automatically Deriving Typeclass Instances in Scala 3. Starting with Scala 3 macros: a short tutorial.

  20. Scala Times Issue #378

    From Highschool to Teaching Scala. Rust for the Seasoned Scala Developer. Bring gRPC payloads and domain models closer with ScalaPB transformations. Flog: a functional logger for Scala. Opaque Type Alias in Scala 3.

  21. Scala Times Issue #377

    Typeclasses in Scala 3. Scala 3 Release Party - find out how it went!. Typelevel Discord migration. Scalabase, May 14th. ScalaCon, May 18th - 21st. and Nov. 2nd - 5th.

  22. Scala Times Issue #376

    Cats Effect 3 - Introduction to Fibers. Bintray to JFrog Artifactory migration status and sbt 1.5.1. Anomaly / outlier detection using isolation forest in Scala. Comparing Concurrent Programming Alternatives. Scala 3: Safer Pattern Matching with Matchable.

  23. Scala Times Issue #375

    A ZIO cheatsheet. Programming in Scala, Fifth Edition. Dealing with Optional Values. Best Features of Scala 3 for Scala.js. ZIO Meetup SF, April 22nd.

  24. Scala Times Issue #374

    Image editing with Monads. Fire-and-Forget in Cats Effect. Programming in Scala, Fifth Edition. Scala 3: Extension Methods. The Scala3 feature I'm most excited about!.

  25. Scala Times Issue #373

    Context is King. How to build an Android app in Scala 2.13. Revisiting Scala Native performance. Scala 3 in sbt 1.5. Programming in Scala, Fifth Edition.

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 bySoftwareMill.
We arehiring.
Andtaking on projects.