A free, once-weekly Scala news flash. Easy to unsubscribe. Goes out every Thursday.
May 3rd, 2018, ISSUE 220

READING

Better logging with Monix 3, part 1: MDC

Monix 3 has a new feature called “local context propagation”, which is essentially ThreadLocals being tied to an execution of a single Task instead of a thread.
Oleg Pyzhcov
Learning how to code with Scala: Hello, World!

My attempt at a “HelloWorld” tutorial with (hopefully) as few assumptions about your coding knowledge as possible.
Sofia Vaughan-Jones (@SofiaVJones)
Flaky tests

Build tools have the ability to extend functionality with a plugin. I have taken this opportunity and created a plugin for sbt, called sbt-flaky, to automate running the test multiple times, analyze test reports and correlate results with recent changes.
Krzysztof Otrebski (@kotrebski)
Responding to Incoming Text Messages with Scala and Finatra

If you’ve ever wanted to create an SMS bot with Scala, you’re in the right place.
Kelley Robinson (@kelleyrobinson)
Understanding F[_] in Scala

This very abstract syntax comes up all the time in Scala, I will try to give you an intuition of what it means and how to use it.
Daniel Sebban (@dsebban)
Macros: the Plan for Scala 3

One of the biggest open questions for migrating to Scala 3 is what to do about macros. In this blog post we give our current thoughts. The gist is that we are trying to achieve full alignment between macros and Tasty.
Martin Odersky and Nicolas Stucki
Lightbend to ramp up Alpakka

We are very happy to announce that the company behind Akka, Lightbend, has set up a separate team to keep after Alpakka and give the community around it the attention it deserves.
The Akka and Alpakka Teams

PRESENTATIONS

Scala - Your First Programming Language - Part 14 - Seven-Segment Display Clock

In this video we will create a fun little project. It is a console application which will display the current time in the retro seven segment display style.
DevInsideYou (@DevInsideYou)
Full set of talks from Scalar Conference 2018

All the talks are now available.
SoftwareMill (@scalarconf)

EVENTS

WIN a ticket to Scala Days Berlin!

Simply send a blog you have written that you would like featured on our website!
Signify Technology (@Signify_Tech)
Lambda World Seattle, September 17th - 18th

Use promo code STLW18 for Scala Times readers to get 10% discount!
47 degrees (@47deg)
Lambda World Cádiz, Spain, October 25th - 26th, 2018

Use promo code STLW18 for Scala Times readers to get 10% discount!
47 degrees (@47deg)
Scala in the City, May 23rd, 2018, Concentra, London, UK

We will hear from Chris Birchall from OVO on Shapeless and Jamie Pullar from Concentra on Cats.
Signify Technology (@Signify_Tech)

RELEASES

scala-collection-compat

Scala 2.13 Collection Compatibility Library
scala-collection-compat contributors
scalafmt 1.5.1 regression fix

An important fix if you're using 1.5.0.
scalafmt contributors
Dotty 0.7.0 and 0.8.0-RC1

sbt 1 support, kind polymorphism, improved support for SAM type.
Dotty contributors
Scala 2.12.6

Macros work again when compiling on Java 9 or 10 fixing 2.12.5 regression
Scala 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 #231

    Can someone explain to me the benefits of IO? . Shared State in Functional Programming. Demystifying Dependency Injection with Airframe. Scala Wars: FP-OOP vs FP. Lambda World Seattle, September 17th - 18th .


  2. Scala Times Issue #230

    Teaching Evolution With Genetic Algorithms. Rolling Your Own Monad To Deal With Nested Monads In Scala. Case Study - Solve Crosswords Puzzle. Scala Type Level – Part 4 : Way to the HigherKinds. Implicits, type classes, and extension methods, part 2: implicit derivation.


  3. Scala Times Issue #229

    How to turn ugly Java APIs into elegant, type-safe Scala APIs. Analyzing Pwned Passwords with Apache Spark. Understanding Parametricity in Scala. Are Scala Streams really lazy?. Convolutional LSTM for ocean temperature with Deeplearning4j.


  4. Scala Times Issue #228

    Compiling Scala Faster with GraalVM. Scala Compiler Options. Scalable read model updates in Akka Persistence. Are there exceptions in Scala?. Lambda World Seattle, September 17th - 18th .


  5. Scala Times Issue #227

    Compilation safety on Playframework’s i18n with Scala Macros. Reflections on using Typelevel Scala. A simple way to write parsers: using the State monad. Writing a simple Telegram bot with tagless final, http4s and fs2. Lambda World Seattle, September 17th - 18th .


  6. Scala Times Issue #226

    Scala in 2018 - The State of Developer Ecosystem by JetBrains. Combining ScalaCheck generators. Scalaz 8 IO vs Akka (typed) actors vs Monix (part 1). Use the decorator pattern for clean I/O boundaries. Scala - AnyVal meets Pattern Matching.


  7. Scala Times Issue #225

    Speeding Up Compilation Time with `scalac-profiling`. Partitioning Akka Streams for Scalability and High-Availability. Bringing back power assert with Expecty. Hot source dependencies using sbt-sriracha. Running akka-cluster on Kubernetes.


  8. Scala Times Issue #224

    Incorporating FaceNet into Play framework with Silhouette authentication. Futures in Scala Protips (part 5): Try more. Zero-Overhead Tree Processing with the Visitor Pattern. More Readable Code in Scala. Relearn your sbt.


  9. Scala Times Issue #223

    Open Offer: Pair program with me. How well do you know your Akka trivia?. ScalaDays 2018 Berlin Takeaways. Scalar 2018 whiteboard voting results!. Implicit Implications (part 1): Implicit Parameters.


  10. Scala Times Issue #222

    Product with Serializable. Scala Enumerations hell. Running Play on GraalVM. Tagless Final algebras and Streaming. 10 Reasons to Learn Scala and FP - DZone Java.


  11. Scala Times Issue #221

    Akka Typed: Hello World in the new API. No More Transformers: High-Performance Effects in Scalaz 8. Writing Internal DSL in Scala. On Bifunctor IO and Java's Checked Exceptions. Partitioning Akka Streams to Maximize Throughput.


  12. Scala Times Issue #220

    Better logging with Monix 3, part 1: MDC. Learning how to code with Scala: Hello, World!. Responding to Incoming Text Messages with Scala and Finatra. Understanding F[_] in Scala. Macros: the Plan for Scala 3.


  13. Scala Times Issue #219

    A quick tour of build tools in Scala. Towards Scala 3. CoRecursive: Graphql And Sangria. Using Redux with Binding.scala. Testing Play Framework with H2 in-memory database.


  14. Scala Times Issue #218

    Cats: Safe Resource Acquisition and Release. An ode to the kind-projector and to the partial-unification of Scala. Models of Computation - Part 2 - How? (inspired by SICP). ScalaUA, April 20-21, 2018, Kyiv, Ukraine. WIN a ticket to Scala Days Berlin!.


  15. Scala Times Issue #217

    A Functional Interface for Key/Value Store. Defeat your 99th percentile with speculative task. Synchronous or asynchronous, and why wrestle with wrappers?. Running Spark on a Cluster: The Basics. Talks from Scalar Conference 2018.


  16. Scala Times Issue #216

    Boilerplate free testing with Scalacheck and Magnolia. ScalaUA, April 20-21, 2018, Kyiv, Ukraine. Scala Sphere, April 15-17, Kraków, Poland. Blockyard Conference, April 13, Gdańsk, Poland. Scala Native 0.3.7.


  17. Scala Times Issue #215

    Akka anti-patterns: overusing ActorSelection. Twilio guardrail: Principled Code-Generation for Type-Safe Languages. Google Summer of Code 2018 Scala Projects. Sequential Traverse for managing parallel resource usage in Scala. Dependency Inversion | Inversion of Control (IoC) For Absolute Beginners.


  18. Scala Times Issue #214

    Cats Effect: IO. Stepping down as the maintainer of scalamacros/paradise. Accessibility of the Scala Compiler. IO Monad and Monad Transformers for Rookies. Exploring Type Annotations in Scala.


  19. Scala Times Issue #213

    Generic Programming and Shapeless with Miles Sabin. Implementing an event-driven HTTP server with Scala Native. Survey on Swagger with Akka HTTP. AST-free JSON parsing. 5 steps of creating your very first Type Class in Scala.


  20. Scala Times Issue #212

    Scala-view: Animate streams of images. Creating forms on your Play application - Part 2. Typesafe Union-type folding in Scala. ManagedT: Compositional resource management. NeoVim + Scala.


  21. Scala Times Issue #211

    Top 15 Scala Libraries for Data Science in 2018. Static Sorting in Slick. Safe(r) mappings in Slick with Shapeless. Tour of Akka Cluster - Cluster Sharding. Akka cluster on kubernetes. Traps and pitfalls.


  22. Scala Times Issue #210

    New key for signing Scala releases. 3 Tips For Maintaining Your Scala Projects. Literal types: a case study. Comonads for scientific and statistical computing in Scala. Choosing between nub and ordNub? In Scala you don't have to!.


  23. Scala Times Issue #209

    Akka streams detailed scaladoc. On Performance of the New Collections. Who am I? Keycloak Impersonation API. Some advice for Alpakka contributors. In Defense of OOFP.


  24. Scala Times Issue #208

    FString: String lengths at compile time. Comparing Scala relational database access libraries. How Do Implicits Work in Scala?. Some Thoughts about Variance in Scala. 200 issues of Scala Times: a bunch of statistics.


  25. Scala Times Issue #207

    There are more types than classes. Caching With Variable TTL Using Scalacache. Sculpt: dependency graph extraction for Scala. SIP-23 Implementation of literal types by milessabin. Algebraic Domain Modelling using Functions With Debashish Ghosh.


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.