A free, once-weekly Scala news flash. Easy to unsubscribe. Goes out every Thursday.
June 15th, 2020, ISSUE 330

READING

A Beginner's Guide to Scala 3.0

In this post, we will get a teaser of what changes to expect from Dotty as well as some of the new changes in the major release.
Manish Mishra
Opening the fridge with ZIO

An example of an application written using some cool features of ZIO.
Wiem Zine (@WiemZin)
Writing functional DSLs for business domains

In this post we’ll build a DSL for filtering emails in Scala. When we’re done, we can compose any email filter using simple, orthogonal building blocks.
Ruurtjan Pul (@Ruurtjan)
cats-effect 3

Cats Effect 3 (or "ce3") is an ongoing project designed to fully replace the existing typeclass hierarchy, overhauling semantics and signatures as necessary, as well as bringing significant improvements in safety, rigor, capabilities, and ergonomics.
Daniel Spiewak (@djspiewak)
What Functional Programming Is, What it Isn't, and Why it Matters

The core premise of functional programming, in my opinion, is that local reasoning and composition make for better code. Here I discuss what these terms mean and the benefits they bring.
Noel Welsh (@noelwelsh)
Scala

Start using Scala with Gitpod!
Dependent Types in Scala 3

I'm recently migrating some libs and projects to Scala 3, I guess it would be very helpful to me or anyone interested to learn some new functional programming features that Scala 3 is bringing to us.
Jichao Ouyang (@oyanglulu)

PRESENTATIONS

Enumerations in Scala

In this video we are going to see a lot of different ways to encode Enumerations in Scala including a library called enumeratum. We will also see support for Enumerations in Scala 3.
DevInsideYou (@DevInsideYou)

EVENTS

Microsphere, June 16th, Online Event

Tech-oriented online sessions dedicated to technology in its broadest sense. Divided into Kotlin / Cloud / Scala tracks.
VirtusLab (@VirtusLab)
Testing with Scala by Adam Fraser, June 29th, Online Workshop

Use promo code SCALATIMES for a 10% discount for our readers!
Ziverge (@zivergetech)
Functional Scala, December 3th-4th, London

Learn the critical topics you need to excel as a Scala developer, and celebrate the Scala programming language and community.
Ziverge (@zivergetech)

RELEASES

zio-slick-interop

Slick interop for ZIO.
zio-slick-interop contributors
Monix 3.2.2

An important bugfix release.
monix contributors
Akka 2.6.6 Released

Split Brain Resolver is included in open source Akka Cluster, Kubernetes friendly SSLEngine provider, and many more updates.
Akka contributors
Akka Persistence JDBC 4.0.0

This is the first major release since the project joined the Akka organisation. Pay attention to the new groupId.
akka-persistence-jdbc contributors





  1. Scala Times Issue #333

    Using akka and react to organize your single page scala.js application. Tagless Final - Part 2 - Introduction to the Expression Problem. Functional, Type-safe, Testable Microservices with ZIO gRPC, July 16th, Online Webinar. Configuration management in Scala using zio-config, July 23rd, Online Webinar. Functional Scala Fundamentals, September 1st-3rd, Online Course.


  2. Scala Times Issue #332

    Mastering modularity in ZIO with ZLayers. Scala/Mill: Step 1, Creating a new Mill project. Cats Concurrency basics with Ref and Deferred. Tagless Final - Part 1 - What is Tagless Final?. Getting started with ZIO.


  3. Scala Times Issue #331

    Managing dependencies using ZIO. Scala Programming - The State of Developer Ecosystem in 2020 Infographic. Announcing the Moving from Scala 2 to Scala 3 course. Streaming all the way with ZIO, Doobie, Quill, http4s and fs2. Playing With Scala - Slick.


  4. Scala Times Issue #330

    A Beginner's Guide to Scala 3.0. Opening the fridge with ZIO. Writing functional DSLs for business domains. What Functional Programming Is, What it Isn't, and Why it Matters. Dependent Types in Scala 3.


  5. Scala Times Issue #329

    Addendum to Alex N's blog post on Scala warnings. Scalar 2020 whiteboard voting. Stream Processing with Scala by Itamar Ravid, June 15th, Online Workshop. Essential Effects, June 15-16th, Online Course. Microsphere, June 16th, Online Event.


  6. Scala Times Issue #328

    Akka Cluster split brain failures -  are you ready for it?. Defining the server logic for an endpoint: three approaches. Implement Event bus using Akka. Zalando case study: why they chose Scala? . A bloop tour for metals users.


  7. Scala Times Issue #327

    Time traveling in tests with Cats Effect. Lightbend To Contribute Commercial Features To Akka Open Source. Functional error handling with monads, monad transformers and Cats MTL. Akka Stream Coexistence With Akka Typed. Orchestrating startup and shutdown in Scala.


  8. Scala Times Issue #326

    A story about streaming unique batches in Monix. GraalVM Native Image Tips & Tricks. Mu-Scala 0.22: Distributed tracing. Using a remote server to build your Scala projects. Circe - Part 2 - JSON Codecs.


  9. Scala Times Issue #325

    Scala Start Page. Starting with Scala 3 macros: a short tutorial. Implementing Authentication on Play Framework. Lunatech and our commitment to the Scala Center. Scala Native Next Steps.


  10. Scala Times Issue #324

    A simple trick to improve type safety of your Scala code. The Power of Akka Streams. Akka Persistence JDBC 4.0.0 release candidate. Scala Book: Free PDF, Mobi, and ePub versions. Testing Embedded H2 DB with Scala and Scalatest.


  11. Scala Times Issue #323

    ZIO + Http4s: a simple API client. FP for Mortals for Cats!. An Introduction to ZIO Kafka. Akka Typed Fundamentals (PL), Online Workshop, April 27th. Scalar Online, May 15th (Extended CFP).


  12. Scala Times Issue #322

    The Death of Hype: What's Next for Scala. IntelliJ Scala Plugin 2020.1. Data processing with Akka Actors: Part II. Akka-http graceful shutdown. A Brief History of ZIO.


  13. Scala Times Issue #321

    Tapir codecs get an update. Data processing with Akka Actors: Part I. A functional comparer. Data Juggling - Part 11 - Getting Started with Squants. Scalar Online, May 15th (CFP).


  14. Scala Times Issue #320

    New feature: Search!. Bake your bread tagless-final style. User-land compiler warnings in Scala. Zio ZLayer with playframework. Testing background process with ZIO.


  15. Scala Times Issue #319

    From idea to product with ZLayer. Edge to Cloud: Building the Tesla Virtual Power Plant . What's the Point of Applicative?. Using ScalaCheck with MUnit. Monitoring and tracing for Akka applications under kubernetes (k8s).


  16. Scala Times Issue #318

    Akka Cluster application design. Spring to ZIO 101. NE Scala in the Time of Social Distancing. Scala 3 support in IntelliJ Scala plugin. Separate Docker Layers for Dependencies and App JARs.


  17. Scala Times Issue #317

    Using Google Datastore with akka-persistence. Functional Program (Re)Design. Writing native CLI applications in Scala with GraalVM. Data Juggling - Part 8 - Getting Started with refined. Fundamentals of Scala, March 14th-15th, Lagos, Nigeria.


  18. Scala Times Issue #316

    How to publish a Scala library in GitHub. Announcing Cats STM 0.7.0. Baking Peixinhos da Horta with ING’s Baker Library. Fundamentals of Scala, March 14th-15th, Lagos, Nigeria. Stairway to Scala Workshop, March 16th-20th, San Damiano, CA, USA.


  19. Scala Times Issue #315

    ZIO for IntelliJ. Scala 2 community build reaches goals. Cats Effect Ref. Using Dotty Union types with Akka Typed – Part II. Caliban Client: a type-safe GraphQL Client for Scala and Scala.js.


  20. Scala Times Issue #314

    Using Dotty Union types with Akka Typed. My FP Journey. Creating a dead simple CountDownLatch with ZIO. ZIO STM: CountDownLatch in two lines. 2019 Scala Developer Survey.


  21. Scala Times Issue #313

    Building Serverless Scala Services with GraalVM. Alpakka Kafka 2.0 Released | @lightbend. Haskell for impatient Scala developer: Getting into speed. Building useful Scalacheck Generators. Easily create New Sync Types with ZIO STM.


  22. Scala Times Issue #312

    Happy eyeballs algorithm using ZIO. How (not) to use shapeless for cross-layer conversions in Scala. So you want to compose some functions. RESTful error handling with Akka HTTP and the library “endpoints”. MUnit is a new Scala testing library · MUnit.


  23. Scala Times Issue #311

    Introducing error reporting in optics. GraphQL in Scala with Caliban - Part 1. Tidying up your SBT file with Scala. Dependency injection with Reader Monad in Scala. Etcd watch API integration with scala and cats-effect.


  24. Scala Times Top Links of 2019

    January: Scala Best Practices. February: Is your Scala object always a singleton?. April: Did Functional Programming get it wrong?. May: The little gems of Scala standard library. June: The Evolution of a Scala Programmer.


  25. Scala Times Issue #310

    Git hooks in Scala projects  - the easy way!. Testing Doobie programs. Implementing typeclasses in Scala I. Effective testing with ZIO Test. Akka Streams: error handling in event processing pipelines.


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.