A free, once-weekly Scala news flash. Easy to unsubscribe. Goes out every Thursday.
August 2nd, 2018, ISSUE 233

READING

Akka HTTP and TCP streaming

An interesting under-the-hood analysis of how TCP streaming in Akka HTTP works
Richard Imaoka (@richardimaoka)
Guardrail book

Combining Swagger/OpenAPI with Scala isn't an easy task. Here's how to use a code-generation approach, Guardrail
Devon Stewart (@blast_hardchese)
The Infamous Cake Pattern for Dependency Injection in Scala - Part 2

This is the 2/3 part of the video series in which we are going to learn about the infamous cake pattern, which is commonly discussed in the context of dependency injection. In order to explore the intricacies of this pattern we are going to write a massively over-engineered todo app with a terminal delivery mechanism and an in-memory persistence layer.
DevInsideYou (@DevInsideYou)
Play Framework Action Composition

How Play ActionBuilders work, and how do they compose? Consolidated knowledge of Play Actions!
Carlos Teixeira
Scala 3 as a new Programming Language

All the best Sam, we'll miss you! In other news, the position of Chief Scala Emacs evangelist is now vacant!
Sam Halliday (@fommil)
[SPARK-14220] Build and test Spark against Scala 2.12 - ASF JIRA

A long-standing issue to make Spark work with Scala 2.12 is now closer to being resolved!
Sean Owen (@sean_r_owen)
How Curalate uses MXNet on AWS for some Deep Learning Magic

AWS, Deep Learning and Scala inference API
Louis K
Keep your domain clean in Event Sourcing

Is combining technical details of persistence (e.g. Akka Persistance) with the business logic a good idea? And how to avoid it?
Andrzej Ludwikowski (@aludwikowski)
My issues with Swagger

Swagger + Scala again: this time, what's wrong with the existing annotation-based approach of integrating Swagger with Akka HTTP?
Mateusz Kubuszok (@MateuszKubuszok)
Scala – Imitating Case Class Apply

How to implement your own apply() we all know and love from case classes? And while we are at it, learn about how these translate to Java's bytecode
Paweł Chorążyk
Apache Kafka 2.0

Apache Kafka 2.0 is here, including Scala APIs for streams!
Apache Kafka Contributors

EVENTS

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 Wave, September 6th - 8th, 2018, Gdańsk, Poland

Use code scalatimes_10, registration with special 10% off discount, to use on the conference day, ends on June 30th!
Scalac (@scalawavepl)
Scala Italy, September 14th-15th, Florence

Use promo code SCALATIMES_U2N for a 10% discount for Scala Times readers!
Scala Italy (@ScalaItaly)
LambdAle, London, September 1st

Use promo code SCALATIMES for Scala Times readers to get 10% discount!
LambdAle (@lambd_ale)
Win a ticket to Scala Italy!

Enter the competition to win a free ticket.
Signify Technology (@Signify_Tech)

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 #234

    Reverse State Monad in Scala. Is it possible?. Typedapi or how to derive your clients and servers from types. Testing in the wild. Akka HTTP request/response scope operations, vs. Deferred operations. Akka anti-patterns: too many actors.


  2. Scala Times Issue #233

    Akka HTTP and TCP streaming. Play Framework Action Composition. Scala 3 as a new Programming Language. [SPARK-14220] Build and test Spark against Scala 2.12 - ASF JIRA. How Curalate uses MXNet on AWS for some Deep Learning Magic.


  3. Scala Times Issue #232

    Akka anti-patterns: Java serialization. Practical Cats: Functor and Applicative. Why Scala Implicits. Implicits, type classes, and extension methods, part 4: understanding implicits. Scala FUD FAQ for newbies.


  4. 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 .


  5. Scala Times Issue #232

    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 .


  6. 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.


  7. 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.


  8. 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 .


  9. 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 .


  10. 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.


  11. 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.


  12. 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.


  13. 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.


  14. 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.


  15. 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.


  16. 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.


  17. 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.


  18. 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!.


  19. 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.


  20. 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.


  21. 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.


  22. 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.


  23. 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.


  24. 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.


  25. 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.


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.