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April 11th, 2019, ISSUE 269

READING

Scalar 2019 whiteboard voting

Is tagless final dead? What's your favourite Scala effect wrapper? What's the biggest Scala problem? See the results!
Adam Warski (@adamwarski)
38 lines of code towards better data validation in Scala

In this article I will show the problem with the validation over nested monads, when the code explodes with boilerplate and it is difficult to separate different levels of abstraction.
Jakub Dzikowski
Scala: Internals and Intermediates

In this guide, we aim to explore Scala’s toolchain and internals.
Alex Heres
How the Lagom framework enables scalable, reactive Microservices in Java and Scala

The pitch for the Lagom framework is that its programming model and architecture allow developers to write microservices that effectively scale across large deployments, that provide desirable application quality-of-life characteristics such as robust error tolerance and application responsiveness, and that take full advantage of the today’s massively-multicore computer hardware.
Jonathan West
Beyond unit tests: an intro to property and law testing in Scala

Learn about the power of property-based testing and law testing.
Daniel Sebban (@dsebban)
Hacker News API Part 5

ZIO is easy to use and very powerful, a great combination. Even though the applications are built using solid pure fp concepts such as the Reader and State monads, these are beneath the surface of the API, and the user can concentrate on building the application.
justinhj (@justinhj)

PRESENTATIONS

Scala Ordering Crash Course

In this video we are going to learn about Ordering - arguably the most known typeclass in Scala.
DevInsideYou (@DevInsideYou)

EVENTS

ScaLATAM, Montevideo, Uruuguay, May 2nd - 3rd

Don't miss the first Scala Conference in Latin America. Use promo code "scalatimes" to get 25% discount for our readers!
ScaLATAM
flatMap(Oslo), Oslo, Norway, May 8th - 9th

Use promo code SCALATIMES for a discount for our readers!
flatMap(Oslo) (@flatmaposlo)
Reactive Horizons, Orlando, Florida, May 31st

This conference is a unique opportunity to learn about top trending topics from today's Fast Data experts!
Reactive Horizons
CFP for LX Scala & Reactive, Lisbon, Portugal, July 4th - 5th

Don't miss the CFP deadline which is May 1st!
LX Scala & Reactive (@LX_Scala)
CFP for Lambda World, Cádiz, Spain, October 17th - 18th

Deadline for submissions is June 1st.
Lambda World (@lambda_world)
CFP for Scala Italy, Bologna, Italy, September 20th - 21st

Submit your proposal before May 5th.
Scala Italy (@ScalaItaly)
Scala in the City - Thursday 25th of April

Automatic differentiation in Scala by Xiayun Sun & Descriptions, APIs and Tapirs by Adam Warski
Scalainthecity (@Scalainthecity)

RELEASES

http4s 0.20.0-RC1

Headers is no longer an Iterable[Header], several changes related to 2.13 support, also some enhancements and bugfixes.
http4s contributors
Scala 2.13.0-RC1

Scala 2.13 is almost here! We are delighted to present the first 2.13 release candidate.
Scala contributors

VARIA

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