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February 25th, 2021, ISSUE 367

READING

The Coralogix Operator: A Tale of ZIO and Kubernetes

Discover zio-k8s and its capabilities.
Daniel Vigovszky (@dvigovszky)
Pure Functional Stream processing in Scala: Cats and Akka - Part 2

In this post, we find how to create Akka flows from pure functions in a syntactically cleaner way, with the help of some extension classes over Source and Flow. We also see how to construct more complex components and stitch them together using the GraphDSL.
Mihai Safta (@saftacatalin)
Introducing the lihaoyi-scala Github Organization

This is a short blog post to introduce the new com-lihaoyi Github organization: a place for all of my most production-ready projects will live to be easily maintained and discovered. We will discuss the status quo, what is changing, and what I hope to achieve with this change.
Li Haoyi (@li_haoyi)
Why Are Fibers Fast?

An excellent explanation why Cats Effect 3’s scheduler is able to achieve the crazy performance numbers we see in practice, and also why it is that fibers are not only an easier model for writing highly scalable modern applications, they are also a faster and more efficient model for running those applications at scale.
Daniel Spiewak (@djspiewak)
Implementing a CountDownLatch (async and dirty)

Yo dawg, I heard you liked concurrency primitives. Let’s implement our own asynchronous, dirty CountDownLatch.
Alexandru Nedelcu (@alexelcu)
Value Classes in Scala

One of the main rules of functional developers is that we should always trust a function’s signature. Hence, when we use functional programming, we prefer to define ad-hoc types to represent simple information such as an identifier, a description, or a currency. Ladies and gentlemen, please welcome the value classes.
Riccardo Cardin (@riccardo_cardin)

EVENTS

ZIO World, March 11th, online event

Join ZIO users and contributors for the inaugural ZIO World, which reveals ZIO 2.0, providing inspiration and new opportunities to create the most powerful reactive applications on the JVM. FREE of charge for all ZIO Contributors and Users.
Ziverge (@zivergetech)
Production-grade microservices with ZIO, March 24th, online event (GMT)

In this talk, Itamar will share from his experience in running microservices-based on ZIO in production: resilient, Kubernetes-friendly structuring; cloud-native observability with logs, metrics and telemetry, and modern ways of service communication.
Itamar Ravid (@itrvd)
Practical Functional Programming with Typescript workshop, May 5th - 7th

20% off for Scala Times readers!
Matechs, Ziverge
ScalaCon, May 18th - 21st. and Nov. 2nd - 5th, online event

Brought to you by ScalaDays and Scala eXchange, ScalaCon is a series of virtual conferences designed to bring the Scala community closer together.
ScalaCon (@scalacon)

RELEASES

Scala 2.13.5

TASTy reader: add support for Scala 3.0.0-RC1, allow name-based extractors to be irrefutable, better support for JVM 13+, and many more improvements.
Scala contributors
akka-persistence-postgres 0.5.0-M1

This release brings major change for journals partitioned by ordering values. (persistence_id, sequence_number) index is now unique and can be (re)built without taking any locks that prevent concurrent inserts, updates, or deletes on the table. In other words migration can be lockless.
akka-persistence-postgres contributors
Metals v0.10.0

Metals is a language server for Scala that works with VS Code, Vim, Emacs, Sublime Text and Eclipse. New version brings type decorations for definitions, insert inferred type refactoring, configuration option for the default Scala version, improved short names when importing and many more updates!





  1. Scala Times Issue #367

    The Coralogix Operator: A Tale of ZIO and Kubernetes. Introducing the lihaoyi-scala Github Organization. Why Are Fibers Fast?. Implementing a CountDownLatch (async and dirty). Value Classes in Scala.


  2. Scala Times Issue #366

    GraphQL Overview  -  Part2  -  Libraries. Scala's List has a Secret. Preventing Version Conflicts with versionScheme. Scala 3 Survey: The Conclusion. Upgrade your Tagless Final with Tofu.


  3. Scala Times Issue #365

    Coding Adventures with Party Parrot Game . Scala Cats Contravariant Functors. From First Principles: Why Scala?. Idiomatic Error Handling in Scala. Stop Letting Your Tests “Make” Your Luck.


  4. Scala Times Issue #364

    Why we need yet another Akka Persistence plugin?. Match Types in Scala 3. A Metals Retrospective (Part 1) · Metals. Making the Spark DataFrame composition type safe(r). Type driven API development using Scala and Tapir.


  5. Scala Times Issue #363

    How to Sort Lists in Scala with Tail Recursion. Image editing with Functors. Tail Recursive Functions (in Scala). Algebraic Data Types (ADT) in Scala. Ep 6: Functional error handling with applicative in Scala 3.


  6. Scala Times Issue #362

    5 Blogs for Scala's Birthday. Monocle 3 Roadmap. Higher-kinded data in Scala. Objects and Companions in Scala. Essential Effects, 27th-29th January, Online Event.


  7. Scala Times Issue #361

    Scala 3: Dependent Types, Part II. Configuring and suppressing warnings in Scala. Threading best practices in Cats Effect. Scala 3 Metaprogramming by Example by Adam Warski. What the Functor?.


  8. Scala Times Issue #360

    Scala 3: Dependent Types, Part I. Publish Scala 2 and Scala 3 macros together. Concurrent state machines. Wire Signals - Yet Another Event Streams Library. Scala Love CFP.


  9. Scala Times Issue #359

    Implementing Type classes in Scala 3. Finite-State Machines + FS2 streams: A match made in heaven. Scala Compiler Options, Fatal Warnings and Linting Guide. ZLayers by example. Scala 3 type classes.


  10. Scala Times Issue #358

    VirtusLab’s Scala 3 cooperation update. Scala 3.0.0-M3: developer's preview before RC1. How to Use Thread.sleep Without Blocking on the JVM. New in Scala 3. Scala Love CFP.


  11. Scala Times Issue #357

    Join the Scala Discord Server!. Enforcing Semantic Versioning with sbt-strict-update. Kafka Cron using wix/greyhound. Scala Filesystem Operations (paths, move, copy, list, delete) . Metals 2020 Review.


  12. Scala Times Issue #356

    Scala 3 Developers' Survey. Tapir vs Endpoints4s. Opaque Type Aliases and Open Classes. Akka Platform Guide. Type classes with Scala 2.


  13. Scala Times Issue #355

    Scala 3 Developers' Survey. Four new features of Scala 2.13 releases that you probably missed. Scala 3: Path-Dependent Types, Dependent Methods and Functions. Message-based Parallelism with Actors. IntelliJ Scala Plugin 2020.3 Is Out!.


  14. Scala Times Issue #354

    Scala 3 Developers Survey. A case for akka-coordination lease. Monad transformers and cats  -  3 tips for beginners. Forward Compatibility for the Scala 3 Transition. Mirror, Mirror on the Wall, Who’s the Genericioust of Them All?.


  15. Scala Times Issue #353

    Scala 3 Developers Survey. Managing Database Migrations in Scala. One year with Akka 2.6. Best practice for natural Ordering. Event-driven railway network based on Pulsar.


  16. Scala Times Issue #352

    Domain-Driven Design with FP in Scala. Explicit term inference with Scala 3. Keep alive for JMS connections. Why You Should Learn Scala in 2020?. A step-by-step guide for debugging memory leaks in Spark Applications.


  17. Scala Times Issue #351

    Autorecovery for (JMS) Streams. ZIO-AWS with ZIO Query. Implementing Scala.js Support for Scala 3. Let’s Talk About the Scala 3 Indentation. Concurrency in Cats Effect 3.


  18. Scala Times Issue #350

    Designing tapir’s WebSockets support. BSP Support in sbt 1.4. Streaming With Probabilistic Data Structures: Why & How. Scala 3 Migration guide. ScalaZONE - Scala 3 Programming Language Courses.


  19. Scala Times Issue #349

    Generic IOApp alternative. Let's build a Scala mock library. How To Make Integration Tests Less Flaky. Option  - the null of our times. Top Link of September: Polynote, A better notebook for Scala.


  20. Scala Times Issue #348

    Java 15 through the eyes of a Scala programmer. Functional Design, October 20th - 22nd, Online training. Scale By the Bay, November 12th - 14th, online event. Functional Data Modeling, November 18th - 19th, Online training. ZIO Hackathon, November 20th-21st, online event.


  21. Scala Times Issue #347

    A short guide to Blocker. Using: Did they forget something?. The assignment operator is broken!. Attending a hackathon with Scala and Akka (Streams) on Microsoft Azure. Programming Scala, Third Edition.


  22. Scala Times Issue #346

    Getting Started with Knative in Scala. Tagless Final - Part 12 - delivery-http-http4s (The Big Rewrite). Programming in Scala for beginners - week 5: classes. Eyjafjallajökull Lecture 2019. Scala 3: Enums.


  23. 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.


  24. 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.


  25. 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.


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