A free, once-weekly Scala news flash. Easy to unsubscribe. Goes out every Thursday.
May 30th, 2019, ISSUE 276

READING

Small & fast Docker images using GraalVM’s native-image

We can use native-image to build a Docker image containing our application, which will not only be much more compact, but also starts faster.
Adam Warski (@adamwarski)
SystemFw FP blog

This page lists various writings from Gitter, Reddit or Github, in their raw form.
Fabio Labella
IO monad: which, why and how

Learn how it is better than your standard imperative approach, how it helps reason, encapsulate side-effects and design more elegant programs.
Mateusz Kubuszok (@MateuszKubuszok)
Counting at compile time

Counting at compile time is one of the world’s simple pleasures. We have taken the scala compiler and hacked something in to it to make it do things it really doesn’t look like it should be doing.
James Phillips
Why I'm Stepping Back from Scalaz

After many wonderful collaborations with some of the most talented Scala developers I know, I have decided to step back from Scalaz, and pull ZIO, my most significant work, into a separate organization—one that is not associated with Scalaz in any way.
John A De Goes (@jdegoes)
ZIO and Cats Effect: Reactive Streams for Functional Scala

Let’s take a look at my top 12 reasons why ZIO and Cats Effect are a match made in heaven!
Mike Gates

PRESENTATIONS

Cats by example

A beginner video series, begin by learning about Either, Validated and State.
Thomas Höfer (@TomTriple)
Monads - Part 3 - Applicative Programming - Manual / Point Kleisli Composition

In this video we will see how Monads help with the manual composition of Kleisli arrows. We will also learn about related constructs like Functors, Applicatives and more.
DevInsideYou (@DevInsideYou)

EVENTS

Reactive Horizons, Orlando, FL, 31st May

Jump into the future of reactive microservices, use promo code FLASHSALE for 25% discount for our readers!
Reactive Horizons
LX Scala & Reactive, Lisbon, Portugal, 4th - 5th July

Use promo code scalatimes_ to get a 40% discount for our readers!
LX Scala & Reactive (@lx_scala)
CFP for Lambda World, Cádiz, Spain, October 17th - 18th

Deadline for submissions is June 1st.
Lambda World (@lambda_world)
BeeScala, Ljubljana, Slovenia, November 21st - 21rd

Don't miss your ticket for this unique conference!
BeeScala (@BeeScalaConf)

RELEASES

Hepek 0.4.0

Static site generator for developers, now with Play suppport.
Sakib Hadžiavdić (@sake_92)
scio v0.8.0-alpha1

A Scala API for Apache Beam and Google Cloud Dataflow. This release brings a lot of bug fixes, improvements and new things like Beam 2.12, BeamSQL and BigQuery Storage API support.
scio contributors
Dotty 0.15.0-RC1

The most exciting thing in this release is the full bootstrap for Dotty, we now always compile Dotty with Dotty itself!
Dotty contributors

VARIA

Scala Times banners?

Want one? Click here
THE INTERNET
Scala Times stickers?

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





  1. Scala Times Issue #300

    How an Optimizing Compiler Works. TMWL October’19  - Scala Steward, DB index and a React hack. Working with HTTP in Polynote. How I learned to stop worrying and love FP in Scala. A real life example of isomorphisms in Scala: POST request.


  2. Scala Times Issue #299

    Kleisli Category - From theory to Cats. Presto with Doobie. Lambda World 2019. Speeding up time with Zio TestClock. Simulating IoT Events - with Zio Streams.


  3. Scala Times Issue #298

    Scala application lifecycle, from pure Scala to FS2. Top 5 things that slow down your Scala build - Triplequote. ZIO, Http4s, Auth, Codecs and zio-test. Magnolia typeclass generation for Avro. Bird Operator in Scala.


  4. Scala Times Issue #297

    Websockets in Scala using sttp. Vim with Dotty (using coc vim). Sizeof in Scala. Scala Classes - Syntax, Declaration, Use case, Examples. How to structure your Scala application?.


  5. Scala Times Issue #296

    Travis Continuous deployment for your open source library. Publish open source project to Maven with Sonatype. My Way to Scala - part 1. Scala Tuples - Syntax, Declaration, Use case, Examples. Better management of transitive dependencies and conflicts.


  6. Scala Times Issue #295

    Tour of Akka Typed: Event Sourcing. Optional Is the New Mandatory. Visitors - a tale of generalization. Working with Databases using Scala and Quill. Proving Primality with GADTs.


  7. Scala Times Issue #294

    Scraping Websites using Scala and Jsoup. A quiet, attractive new programming language. Domain-driven event sourcing with Akka Typed. Crushing Design Patterns! - Chain of responsibility (Scala). Crushing Design Patterns! - Unnecessary Patterns.


  8. Scala Times Issue #293

    Painlessly passing message context through Akka Streams. Simple Web and Api Servers with Scala. From @Transactional to type-safe, reasonable transactions. 3 Layer Scala Cake. Illustrated guide to Types, Sets and Values.


  9. Scala Times Issue #292

    Human-readable case class diffs. Cats 2.0 migration guide. Top 10 Scala Libraries For Data Science. Kenji Yoshida receives community award. Kelley Robinson receives community award.


  10. Scala Times Issue #291

    Squeezing extra productivity out of Ammonite Scala REPL. Akka family build infrastructure. Learning Akka Typed from Classic. On Eliminating Error in Distributed Software Systems. Error Handling in Functional Applications - from Monad Transformers to ZIO.


  11. Scala Times Issue #290

    Easy Parallel Programming with Scala Futures. Permutive Community Engineering, August 2019. Key things I picked up while working with Scala. Typing the technical interview in Scala. Why Try? - Scala Error Handling.


  12. Scala Times Issue #289

    Dotty (Scala 3) adoption report: easy so far. Scraping and Storing Crypto-currency Prices with Scala and PostgreSQL. Scala Almost Succeeded. Allow significant indentation syntax. Jailbreak Oozie Spark action.


  13. Scala Times Issue #288

    Bootzooka 2019: functional Scala and React. The Science of Functional Programming book. Scala's isInstanceOf is an Anti-Pattern. A Scala “functional programming style” To-Do List application written with Cats. Minutes of the 13th meeting of the Scala Center, Q2 2019.


  14. Scala Times Issue #287

    When do you need Akka Cluster?. Hangman in FP Scala. Make your Google Spreadsheets Scala-ble. Understanding Monoids using real life examples. Scala in the City, London, Simply Business, August 28th.


  15. Scala Times Issue #286

    Tic-tac-toe in FP Scala. How to create Build Pipelines in Scala. Tour of Akka Typed: Message Adapters, Ask Pattern and Actor Discovery. Promise for better Future. Streaming data with Apache Kafka and Akka Streams.


  16. Scala Times Issue #285

    Monad Transformers and Cats MTL. Ratelimiter4s : A functional rate limiting library. A way out of the Jar Hell. Wrapping impure code with ZIO. XXE Attacks in Scala and Play Framework.


  17. Scala Times Issue #284

    Cross-compiling In Scala. IntelliJ Scala Plugin 2019.2. Introducing Scala Cypher DSL. Tame your config. A rate-limiter in 15 lines of code with cats-effect.


  18. Scala Times Issue #283

    Python vs. Scala: a comparison of the basic commands. Keep your projects up-to-date with Scala Steward. My favorite new features of Scala 2.13 standard library. Implementing a server for the Language Server Protocol. Homegrown Scala Collections: Testing Streams.


  19. Scala Times Issue #282

    Read Pure functional HTTP APIs in Scala | Leanpub. Combining ZIO and Akka to enable distributed FP in Scala. Rethinking Streaming Workloads with Akka Streams: Part II. ES/CQRS the Akka way - Krunoslav Uzelac - Medium. Tour of Akka Typed: Protocols and Behaviors.


  20. Scala Times Issue #281

    Abstracting Over Effect Types. Reusable pre-commit hooks in Scala projects. Functional Highlighting for Functional Programming. Top Link of June: The Evolution of a Scala Programmer. Lambda World, Cádiz, Spain, October 17th - 18th.


  21. Scala Times Issue #280

    Comonads for Life. TypeSafe journey using Scala. Scala programming language wins SIGPLAN award. Shapeless' HLists and how to traverse them. How to work with JSON in Scala.


  22. Scala Times Issue #279

    Thread shifting in cats-effect and ZIO. How to work with HTTP JSON APIs in Scala. ZIO with http4s and doobie. Optimizing CI build times for Scala projects. The False Hope of Tagless-Final in Scala.


  23. Scala Times Issue #278

    Counting to infinity at compile time. Vectos - A functional ecosystem. Scala 2.13.0 for the Akka family. The place of applicative style in today's Scala. This Month We've Learned - May’19 .


  24. Scala Times Issue #277

    Final Free Structures with Subtyping. Exploring the STM functionality in ZIO. The Evolution of a Scala Programmer. How to work with Files in Scala. Top Link Of May: The little gems of Scala standard library.


  25. Scala Times Issue #276

    Small & fast Docker images using GraalVM’s native-image. SystemFw FP blog. IO monad: which, why and how. Counting at compile time. Why I'm Stepping Back from Scalaz.


Organizing an event?
Promote it with
Scala Times.
The Scala Times reader?
Get a banner!
Got a tip? Send it in!
Follow us on Twitter.
Curated by SoftwareMill.
We are hiring.
And taking on projects.