A free, once-weekly Scala news flash. Easy to unsubscribe. Goes out every Thursday.
May 7th, 2020, ISSUE 325

READING

Scala Start Page

Finally, a tailored website with all the resources needed for a proper start with Scala!
SoftwareMill (@softwaremill)
Starting with Scala 3 macros: a short tutorial

See how the flagship "principled metaprogramming" feature of Scala 3 works in action.
Adam Warski (@adamwarski)
zio-properties: A ZIO alternative to Spring Properties

I have built a library called zio-properties (on top of zio-config and magnolia) that checks multiple sources and retrieves properties based on a standard resolution order.
Adrian Filip (@realAdrianFilip)
Implementing Authentication on Play Framework

User authentication is a sensitive topic: everyone expects to work flawlessly, and if there’s any security issue it can easily take the full company down.
Pedro Rijo (@pedrorijo91)
Lunatech and our commitment to the Scala Center

In the coming months, we’ll be keeping you updated on the work that we’re doing to continually support the Scala Center. We’re excited for the upcoming release of Scala 3 and to continually see the Scala tooling ecosystem improve.
Chris Kipp
Scala Native Next Steps

Read the summary of short-term, mid-term, and long-term goals.
Ergys Dona (@ergysdona)
Building the Death Star with ZIO Stream

Building space stations has never been easier. Using a few ZStream operations - zip, map, mapConcat, group, collect, via, take and runCollect - we managed to build a space station the size of a moon, combining different sources, dealing delays and unexpected random events, easily making them work together.
Juliano Alves (@vonjuliano)
Import Suggestions in Scala 3

This article shows these improvements in action in concrete examples of code.
Julien Richard-Foy (@julienrf)
Effect Tracking Is Commercially Worthless

There's zero value in pursuing the illusive "effect tracking"!
John A. De Goes (@jdegoes)
Thoughts on Recent Online-Only Conferences

Online-only conferences will be the new normal, and they can be as good, or even better in some regards, than the traditional in-person form.
Adam Rosien (@arosien)
cached compilation for sbt

An exciting update, allowing a very significant build time speedup!
Eugene Yokota (@eed3si9n)

PRESENTATIONS

Circe - Part 1 - Introduction to working with #JSON in #Scala

This video is an introduction to working with JSON in a statically typed language like Scala with a prominent library called circe which is powered by Cats.
DevInsideYou (@DevInsideYou)

EVENTS

Scalar Online, May 15th Agenda is live!)

Agenda is live now! Get ready for Scalar!
SoftwareMill (@scalarconf)
Scala Swarm, June 18th-23rd, Porto, Portugal

Ticket sale is now open, come quick and grab your ticket to this unique event!
ScalaSwarm (@ScalaSwarmConf)
Scalar Workshops, October 8th-10th, Warsaw, Poland

Get ready for the workshop-driven FP event in Poland!
SoftwareMill (@scalarconf)
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)
Virtual Scala in the City Conference, May 28th

Call for Speakers is open! Scala in the City Conference is for anyone who is passionate about learning and sharing their Scala and Functional programming knowledge.
Signify Technology (@Signify_Tech)

RELEASES

sort-imports 0.5.0

Now with smarter than "just ascii" sorting!
sort-imports contributors
ZIO for IntelliJ

Lots of new features and bugfixes in this release!
ZIO plugin contributors
onnx-scala 0.3.0

An ONNX (Open Neural Network eXchange) API, Code Generator and Backend(s) for Typeful, Functional Deep Learning in Scala. Featuring a new backend based on ONNX Runtime.
Alex Merritt
Dotty 0.24.0-RC1

2.13.2 standard library, better error messages and more.
Dotty contributors
Alpakka 2.0 Released

This release brings some serious updates to many connectors, make sure to check it out!
Alpakka contributors (@akkateam)
Akka Persistence Cassandra 1.0

Major upgrade of the Cassandra driver, Now built on top of Alpakka Cassandra, Shared database connection pool between all parts of the plugin, and many more updates.
Akka Persistence Cassandra contributors
Metals v0.9.0 - Lithium

Metals is a language server for Scala that works with VS Code, Vim, Emacs, Sublime Text, Atom and Eclipse. Main focus is introducing support for Scala 3 starting with versions 0.23.0 and 0.24.0-RC1. We also added support for Scala 2.13.2 and a number of other useful improvements.
metals contributors

VARIA

Scala Times banners?

Want one? Click here
THE INTERNET
Scala Times stickers?

Want one? Let us know or tweet @scalatimes.
THE INTERNET
Scala experts?

Need some? SoftwareMill is here, ready to talk and dive deep into your code.
SoftwareMill





  1. 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.


  2. 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.


  3. 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.


  4. 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.


  5. 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).


  6. 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.


  7. 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).


  8. 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.


  9. 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).


  10. 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.


  11. 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.


  12. 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.


  13. 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.


  14. 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.


  15. 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.


  16. 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.


  17. 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.


  18. 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.


  19. 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.


  20. Scala Times Issue #309

    Towards more functional Play — Part 2. TMWL’ Dec 19 — Scala 3 overview, Scala hacks and DevOps hints. Scala etcd client with etcd4s and cats-effects. Boilerplate-free type class definition. GCP Cloud Functions with Scala.js in 10 lines(ish).


  21. Scala Times Issue #308

    Towards more functional Play  -  Part 1. ZIO environment meets constructor-based dependency injection. How-to run tests in parallel with sbt. Learn myself some Scala 3, episode 4: strict equality. 5 pitfalls to avoid when starting to work with ZIO.


  22. Scala Times Issue #307

    Standardizing IO Interfaces for Scala Libraries. WebSocket Streaming with Scala. State of Monocle. Scala tooling in 2019. How to Work with Scala Collections in Java.


  23. Scala Times Issue #306

    2019 Scala Developer Survey . Lessons Learned Building a Van Laarhoven Lens Library. A Glossary of Functional Programming. Tips for moving from tut to mdoc. Notes on Category Theory in Scala 3 (Dotty).


  24. Scala Times Issue #305

    Beyond Liskov: Type Safe Equality in Scala. Scala 2 Roadmap Update: the Road to Scala 3. Explicit nulls are in!. Functional Scala London 2019: Day 1. Leveraging Monoids for More Powerful Summarization.


  25. Scala Times Issue #304

    Akka references serialization with Protobufs (up to Akka 2.5). TMWL November’19 — ScalaTest, Medusa, PW-Sat2 cubesat. Implement your future with ZIO. Decouple the Program from its Implementation with ZIO modules. ZIO environment and modules pattern: zio, scala.js, react, query management.


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.