A free, once-weekly Scala news flash. Easy to unsubscribe. Goes out every Thursday.
January 24th, 2019, ISSUE 258

READING

Scala Days 2019 - Celebrating Collaborative Success

This blog aims to answer various questions we’ve been asked in the last 6 months.
Darja Jovanovic (@darjutak)
Scala community build grows, adds Scala 2.13 and JDK 11

This post highlights the progress the community build has made in the last year.
Seth Tisue (@SethTisue)
Type-checked triple equals: Scala test

Learn how to use this custom way for equality checks.
Ayush Mittal
Using Scala Plugins From Gradle

A short example of how to do this outside sbt.
Damian Reeves
Exploring Explicit Nulls in Dotty

This project seeks to make it illegal to put null into a reference type unless you explicitly say that there might be one there.
Mark "Justin" Waks (@jducoeur)
Efficiently Compiling Spark Jobs Built in Scala and SBT on Build Machines

Finding ways to make the deployment efficient can greatly improve the process, and that can be achieved with a few simple strategies.
Adel Helal
What does Haskell do better than Scala?

This is a serious question, and there are quite a few serious and interesting answers!
hmemcpy

PRESENTATIONS

Homegrown #Scala Collections - Part 22 - FORmidable Comprehensions in Depth

In this video we will learn about for comprehensions and see what exactly they desugar to.
DevInsideYou (@DevInsideYou)

EVENTS

Scalar, Warsaw, Poland April 5-6, 2019

Join the next edition of the largest Scala conference in central Europe!
SoftwareMill (@softwaremill)
Lambda Days, Kraków, Poland, February 21-22, 2019

Use promo code SCALArlz10 for a 10% discount for our readers!
LambdaDays (@LambdaDays)
flatMap(Oslo), May 8-9, 2019

Use promo code SCALATIMES for a discount for our readers!
flatMap(Oslo) (@flatmaposlo)

RELEASES

seed

Build tool for Scala projects.
Tim Nieradzik (@timnieradzik)
univeq

Safer universal equivalence (==) for Scala.
David Barri (@japgolly)
Lightbend Orchestration 1.6.0

Lightbend Orchestration is a suite of tools that helps you deploy Lagom applications to OpenShift and Kubernetes. Lightbend Orchestration 1.6.0 is a maintenance release to catch up with Akka Management updates.
Eugene Yokota (@eed3si9n)
newtypes

Better newtypes for Scala.
Alexander Konovalov (@alexknvl)
scala-native-wasm

Running Scala in WebAssembly through Scala Native.
Shadaj Laddad (@ShadajL)
cats-effect 1.2.0

This release is binary compatible with 1.1.0 and the 1.x series. Adds new operations on Resource, fixes bugs, updates Scala to 2.12.8.
cats-effects contributors
Announcing Dotty 0.12.0-RC1

Extension Methods, TASTy Reflect goodies, Alignments with the Scala Improvement Process, Improvements to GADT support.
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 #262

    Is your Scala object always a singleton?. Freer doesn’t come for free. Maintaining Binary Compatibility in Scala. Anatomy of functors and category theory. A little Scala 'sed' class.


  2. Scala Times Issue #261: from Scala with love

    Aecor — Purely functional event sourcing in Scala. Part 5. Homegrown #Scala Collections - Foldable Maps. Kubernetes Liveness and Readiness Probes Revisited. Streams and Resource Safety | Akka. Assemble messages from Akka Actors.


  3. Scala Times Issue #260

    Cats Ecosystem Community Survey 2018 Results. Thread Pool Best Practices with ZIO. Purely functional parallelism in Scala. Finatra meets Ammonite. Typed Supervision: why the changes?.


  4. Scala Times Issue #259

    State of Scala compilation time in 2018. Low-memory symbol indexing with bloom filters. Finally: Top-level Definitions. Why you should think about functional programming. Toward a polyglot James server….


  5. Scala Times Issue #258

    Scala Days 2019 - Celebrating Collaborative Success. Scala community build grows, adds Scala 2.13 and JDK 11. Type-checked triple equals: Scala test. Using Scala Plugins From Gradle. Exploring Explicit Nulls in Dotty.


  6. Scala Times Issue #257

    High-Performance Functional Programming Through Effect Rotation. Trampolines for Everything. This month at SoftwareMill we’ve learned — December’18. A Guide to Scala Collections: Exploring Monads in Scala Collections. Spark Custom Stream Sources.


  7. Scala Times Issue #256

    Where is the llama for FS2?. Scala Best Practices - Foreword. Aecor - Purely functional event sourcing in Scala. Part 4b. Postgresql from Spark, how to query?. Error Handling in Akka Actor (with Future).


  8. Scala Times Issue #255

    ADT through the looking glass - lenses, prims and other optics. Hpc with scala and akka Actors. Scala Type Classes - The Name Printer. Evolutionary Algorithms on the JVM via Scala  -  a minimal introduction. Aecor - Purely functional event sourcing in Scala. Part 4a.


  9. Scala Times Issue #254

    Cats Ecosystem Community Survey 2018. Scala Developer Suvey Results 2018. Minutes of the 11th meeting of the Scala Center, Q4 2018. Software as a Reflection of Values With Bryan Cantrill. Dotty: An Alternative to Implicits.


  10. Scala Times Issue #253

    Scala Variables - Syntax, Declaration, Use case, Examples - Leo Benkel. Fast goto definition with low memory footprint · Metals. New Akka Getting Started Guide. Different ways to understand a monad. MOOC: Introduction to programming with dependent types in Scala.


  11. Scala Times Issue #252

    The F-words: functor and friends. Grafter  -  a take on yet another DI library. Anatomy of a Scala quirk. Creating Work Queues with Apache Kafka and Apache Pulsar. Terminus - Cross Platform Terminal Emulator for Sublime Text.


  12. Scala Times Issue #251

    Scala Numerical Performance with Scala Native and Graal. SBT Plugin - How to make it, debug it, improve it?. Better than IO, part 1. Scala and Slick - An Introduction. Category Theory for Programmers: Scala Edition 1.1-RC.


  13. Scala Times Issue #250

    Correlation IDs in Scala using Monix. Further enhance `new` syntax to reduce boilerplate. Counting type inhabitants. Variances in Scala. SIP Meeting Minutes - November 1-3 2018.


  14. Scala Times Issue #249

    How To Exclude Scala Tests With Tagging?. Explore Witnesses as an Alternative to Implicits. Build code analyzers with Scalameta and Scalafix. Immutable State in Real World. A streaming library with a superpower: FS2 and functional programming.


  15. Scala Times Issue #248

    Minutes of the 10th meeting of the Scala Center, Q3 2018. Scala - faster and slimmer with GraalVM. 5 themes for Scala programming in 2019. Beyond the conference: Q&A with The Guardian’s Maria-Livia Chiorean. Homegrown Scala Collections - Part 13 - Growing Binary Search Trees.


  16. Scala Times Issue #247

    Getting started with recursion schemes using Matryoshka. Friendly Functional Programming. Building the Hangman Game using ScalaZ ZIO. Anatomy of semigroups and monoids. The Scala 2.12 / 2.13 Inliner and Optimizer.


  17. Scala Times Issue #246

    Don’t get mixed. Typed Functional Programming and Software Correctness. Scala compiler phases with pictures. A tale on Semirings. Scala Programming  -  A Skeptic’s Journey.


  18. Scala Times Issue #245

    Scala Center highlights June - October. Fastparse 2: Even Faster Scala Parser Combinators. God’s Programming Language With Philip Wadler. Algebraic Data Types in four languages. Finch Performance Lessons.


  19. Scala Times Issue #244

    Achieving stack and heap safety in recursive functions. A comprehensive introduction to Cats-mtl. Using Akka Http to create a test server. Skoda's new hatchback is called 'Scala'. Are you sure your AnyVals don’t instantiate?.


  20. Scala Times Issue #243

    Introducing Scaladoc Tables. This month at SoftwareMill we’ve learned. Backoff and Retry Error-Handling for Akka Streams. Anatomy of functional programming. Anatomy of an algebra.


  21. Scala Times Issue #242

    Using Monix with Kafka, Avro and Schema Registry. Scala is now on Apache License Version 2.0. Just Enough Scala for Spark Programmers. Giter8 Scala Microservice template. Homegrown Scala Collections - Part 7 - Parametric Polymorphism aka Generics.


  22. Scala Times Issue #241

    Model correctly and write less code, using Akka Streams. Elevator Control System using ZIO. Easing Into Cats, And The Case For Category Theory Inspired Abstractions. Get considered harmful. IO & Logging Capabilities.


  23. Scala Times Issue #240

    2018 Scala compilation time survey. How to Dockerise a Scala and Akka HTTP Application. Using Machine Learning to Predict the Weather in Basel. How We Found a Missing Scala Class. New proposal for extension method.


  24. Scala Times Issue #239

    Functional Programming for Mortals. Strings are not the type you are looking for. Choose Primitives for Typelevel and Meta Programming in Scala 3.0. To tag a type. Parallelize tests in SBT on Circle CI.


  25. Scala Times Issue #238

    How to translate your API with Shapeless. A case to introduce Scala in a Java world. Are Scala Futures the past?. Effect Extensions Pattern. Dotty Type classes.


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.