A free, once-weekly Scala news flash. Easy to unsubscribe. Goes out every Thursday.
September 10th, 2020, ISSUE 343


Underscores are Overloaded in Scala!

In this article I'll share almost all the places where you might see an underscore, so that you don't freak out when you see yet another one in a different context.
Daniel Ciocîrlan (@DanielCiocirlan)
Scala, React, and SSR (part 2)

This article will explain how to reclaim the speed, once again, by using scala-graal.
David Barri (@japgolly)
Scala Africa Development Program Has Launched

Designed to bring free, high-quality education to JVM and Scala developers on the African continent.
Ziverge (@zivergetech)


Tagless Final - Part 9 - persistence-postgres-skunk (The Big Rewrite - Part 5)

In this video we will begin bolting a postgres database on top of our todo app. We will use the Skunk library to accomplish that. This video discusses only commands & queries. The next video will finish the postgres layer.
DevInsideYou (@DevInsideYou)


Scala micro.sphere.it, September 15th

An evening with 3 great Scala presentations, including Martin Odersky!
VirtusLab (@VirtusLab)
Essential Effects EU, September 14th-16th, Online Course

Essential Effects introduces Cats Effect as a tool for building resource-safe and concurrent applications. If you self-identify as underrepresented or unemployed, we're happy to offer a 50% discount. Use discount code "scalatimes" for an additional 15% off.
Inner Product (@InnerProductLLC)
Functional Effects, September 23rd-24th, Online training

In this course, Scala developers will learn how to solve complex problems in asynchronous, concurrent programming using the ZIO library. Use code "ScalaTimes10" to receive 10% off at the checkout.
John A. De Goes (@jdegoes)
Virtual Scala, September 24th, Online Meetup

Talks: "Multi-Tenancy at Scale" by Sahil Anand, and "Using Aspects to transform your codes with ZIO Environment" by Adam Fraser. The meetup will take place online via GoToWebinar on the 24th of September, 2020 at 19:00 GMT+2.
Ziverge (@zivergetech)
Functional Scala CFP

The CFP closes on October 15th
Ziverge (@zivergetech)
Functional Design, October 20th - 22nd, Online training

In this course, developers will learn how to write simple functional solutions to everyday business problems, without jargon and without type classes. Use code "ScalaTimes10" to receive 10% off at the checkout.
John A. De Goes (@jdegoes)
The Rise of Loom and the Evolution of Reactive Programming, October 22nd, Online meetup

On Thursday, October 22nd at 5:00 PM John A. De Goes will be giving a talk to the online meetup of ZIO London.
John A. De Goes (@jdegoes)
Functional Data Modeling, November 18th - 19th, Online training

In this course, developers will learn how to use functional Scala to construct simple, precise, and flexible models of any business domain. Use code "ScalaTimes10" to receive 10% off at the checkout.
John A. De Goes (@jdegoes)
ZIO Hackathon, November 20th-21st, online event

Attendees of ZIO Hackathon 2020 will be able to attend talks on ZIO projects from leading open source contributors, as well as receive expert mentorship in contributing features, bug fixes, and documentation enhancements to the ZIO ecosystem of libraries.
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)
Scala 3 for Scala 2 developer, December 8th - 10th, Online training

In this course, developers who are already familiar with Scala 2.x will get a high-speed introduction to all the changes coming in Scala 3, including semantic changes, syntactic changes, new features, and dropped features. Use code "ScalaTimes10" to receive 10% off at the checkout.
John A. De Goes (@jdegoes)
Functional Scala Megapack (4 workshops)

Functional Effects + Functional Design + Functional Data Modeling + Scala 3 for Scala 2 developers. Use code "ScalaTimes10" to receive 10% off at the checkout.
John A De Goes (@jdegoes)


cats v2.2.0

This is the seventh major release in the Cats Effect 2.x lineage. Asyncrhonous tracing, Bracket Forwarders, Performance Improvements in Deferred, and no more import cats.implicits._!
cats contributors
cats-mtl 1.0.0

This release contains a full rewrite of… everything. It is not binary compatible with 0.7.x or any of the previous releases, nor is it source-compatible, but most of the changes should be relatively straightforward to adapt to on the usage side.
cats-mtl contributors
sbt 1.4.0-RC1

Build server protocol (BSP) support, sbtn: a native thin client for sbt, build caching and more!
sbt contributors

ninny-json is an experiment to look at what JSON type classes would look like if they made a distinction between absent JSON fields, and fields with null values.
Nathaniel Fischer
Weaver Test

A lean test-framework built on top of cats-effect and fs2
weaver-test contributors


Scala Times banners?

Want one? Click here
Scala Times stickers?

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

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

  1. Scala Times Issue #345

    Tour of Scala. Polynote, A better notebook for Scala. Single command Scala setup. Dotty becomes Scala 3. Functional Effects with ZIO.

  2. Scala Times Issue #344

    Can we build better?. Algebra and Parametricity. How to Deploy a Scala Application to AWS Lambda. 5 lessons learned from my continuing awesome journey with ZIO. Scala 3 - A community powered release.

  3. Scala Times Issue #343

    Underscores are Overloaded in Scala!. Scala, React, and SSR (part 2). Scala Africa Development Program Has Launched. Scala micro.sphere.it, September 15th. Essential Effects EU, September 14th-16th, Online Course.

  4. Scala Times Issue #342

    What’s coming up in sttp client 3?. FP in the City Virtual Conference, September 10th. Scala Castle, September 14th-17th. Scala micro.sphere.it, September 15th. Essential Effects EU, September 14th-16th, Online Course.

  5. Scala Times Issue #341

    Concurrency In Scala with Cats-Effect. Scala, React, and SSR (part 1). More Algebra of Algebraic Data Types. Akka HTTP 10.2 Release - Q/A with the Akka team. Type-Level Programming in Scala, Part 3.

  6. Scala Times Issue #340

    SoftwareMilling around OSS - Scala Love. More Intuition on Optics. Type-Level Programming in Scala, Part 2. An Introduction to Functional Design. VimtelliJ: All the best of Vim in IntelliJ.

  7. Scala Times Issue #339

    Scala Knowledge Bits Archives. Functional Effects with ZIO. Experiment with Loom. Auto publish sbt plugin from Travis CI. Scala String Interpolation.

  8. Scala Times Issue #338

    ZIO 1.0 Released. Retry Failing Tasks with Cats and Scala. An Intuition for Optics. Evoneering - Scala Bootcamp. How Does "20 seconds" Work in Scala?.

  9. Scala Times Issue #337

    Thinking With Types. IntelliJ Scala Plugin 2020.2 is released!. Announcing Dotty 0.26.0-RC1. A Dive into Configuring Metals · Metals. Life with fatal warnings.

  10. Scala Times Issue #336

    IntelliJ Scala Plugin 2020.2: Auto-import for Implicits. "First Class" Types in Scala 3. What is an Effect?. Writing Angular Services in Scala. Tagless Final - Part 4.2 - Why The F[_].

  11. Scala Times Issue #335

    Actors using Scala & Akka  - Part 2: AskPattern and SpawnProtocol. Railway Oriented Programming in Scala. Mocking endpoints with ZIO sttp. Top Link Of June: A Beginner's Guide to Scala 3.0. Tagless Final - Part 4.1 - Power to the Interpreters!.

  12. Scala Times Issue #334

    Scaling Event Bus. One-click install for Scala. Visual Scala reference. Functional, Type-safe, Testable Microservices with ZIO gRPC, July 16th, Online Webinar. Configuration management in Scala using zio-config, July 23rd, Online Webinar.

  13. 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.

  14. 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.

  15. 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.

  16. 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.

  17. 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.

  18. 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.

  19. 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.

  20. 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.

  21. 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.

  22. 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.

  23. 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).

  24. 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.

  25. 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).

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.