Scala ecosystem - Dublin Scala Meetup, Oct 2018

Oct 24, 20180 likes104 views

This document provides an overview of personalities, learning resources, tools, libraries, and frameworks in the Scala ecosystem. It discusses influential Scala figures like Martin Odersky, Roland Kuhn, John De Goes, and Daniel Spiewak. Popular learning resources mentioned include courses on Coursera and websites like Scalacenter. Libraries and tools highlighted are Play Framework, Akka, Cats, ScalaZ, Shapeless, Scalatest, and IDEs like IntelliJ and Eclipse.

Scala ecosystem
Mikhail Girkin
Software engineer
HBC
@mike_girkin

Agenda
- Personalities
- Learning resources
- Libraries
- Tools

Scala language designer
2 courses on Coursera
Youtube conference talks and lectures
Martin Odersky

● Reactive streams
● Akka
“Reactive design patterns”
“Principles of reactive programming” (et al)
Roland Kuhn

Eric Meijer
● C# and LINQ
● Reactive extensions
● Haskell
“Principles of reactive programming” (et al)

Learning resources
Scalacenter https://scala.epfl.ch
Exercises by “47 Degrees” https://www.scala-exercises.org
Coursera - free courses
Scastie https://scastie.scala-lang.org
Awesome scala https://github.com/lauris/awesome-scala

IDE
IntelliJ IDEA
Eclipse/ScalaIDE
Emacs + Ensime

Play framework
Full-fledged web framework:
● Http handling
● Templates
● Json
● Dependency injection
● WebSockets
● SQL databases access - slick or anorm

Akka*
Actor-based distributed platform
● Akka-actors
● Akka-streams
● Akka-http
● Alpakka

Unit testing
Honorable mentions
● Scalatest
● Specs2
● Scalacheck
● Scalamock
● Mockito

Cats
You are enlightened!
From OO-world into shiny functional programming
Typeclasses everywhere
Semigroups, functors and monads awaiting

Cats ecosystem
Do the job in a functional way
● fs2
● Http4s
● Circe
● Doobie
● Hammock
● cats-effect
Free book - “Scala with Cats” https://underscore.io/books/scala-with-cats

ScalaZ
Where Scala FP has started
● Category theory implemetation
● Streams
● ZIO and effects
Pay what you want book - ”Functional Programming for Mortals”
https://leanpub.com/fpmortals

Shapeless
Advanced generic programming
Let the compiler do the boilerplate for you!
● Polymorphic functions
● HList - tuples on steroids
● Discriminated unions - “either for more then 2”
● Lenses
● Many more

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Join Ajay Sarpal and Miray Vu to learn about key Marketo Engage enhancements. Discover improved in-app Salesforce CRM connector statistics for easy monitoring of sync health and throughput. Explore new Salesforce CRM Synch Dashboards providing up-to-date insights into weekly activity usage, thresholds, and limits with drill-down capabilities. Learn about proactive notifications for both Salesforce CRM sync and product usage overages. Get an update on improved Salesforce CRM synch scale and reliability coming in Q2 2025. Key Takeaways: Improved Salesforce CRM User Experience: Learn how self-service visibility enhances satisfaction. Utilize Salesforce CRM Synch Dashboards: Explore real-time weekly activity data. Monitor Performance Against Limits: See threshold limits for each product level. Get Usage Over-Limit Alerts: Receive notifications for exceeding thresholds. Learn About Improved Salesforce CRM Scale: Understand upcoming cloud-based incremental sync.

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Tests, especially unit tests, are the developers’ superheroes. They allow us to mess around with our code and keep us safe. We often trust them with the safety of our codebase, but how do we know that we should? How do we know that this trust is well-deserved? Enter mutation testing – by intentionally injecting harmful mutations into our code and seeing if they are caught by the tests, we can evaluate the quality of the safety net they provide. By watching the watchmen, we can make sure our tests really protect us, and we aren’t just green-washing our IDEs to a false sense of security. Talk from SciFiDevCon 2025 https://www.scifidevcon.com/courses/2025-scifidevcon/contents/680efa43ae4f5

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Software testing plays a crucial role in the contribution process of open-source projects. For example, contributions introducing new features are expected to include tests, and contributions with tests are more likely to be accepted. Although most real-world projects require contributors to write tests, the specific testing practices communicated to contributors remain unclear. In this paper, we present an empirical study to understand better how software testing is approached in contribution guidelines. We analyze the guidelines of 200 Python and JavaScript open-source software projects. We find that 78% of the projects include some form of test documentation for contributors. Test documentation is located in multiple sources, including CONTRIBUTING files (58%), external documentation (24%), and README files (8%). Furthermore, test documentation commonly explains how to run tests (83.5%), but less often provides guidance on how to write tests (37%). It frequently covers unit tests (71%), but rarely addresses integration (20.5%) and end-to-end tests (15.5%). Other key testing aspects are also less frequently discussed: test coverage (25.5%) and mocking (9.5%). We conclude by discussing implications and future research.

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Scala ecosystem - Dublin Scala Meetup, Oct 2018

1. Scala ecosystem Mikhail Girkin Software engineer HBC @mike_girkin

2. Agenda - Personalities - Learning resources - Libraries - Tools

3. Scala language designer 2 courses on Coursera Youtube conference talks and lectures Martin Odersky

4. ● Reactive streams ● Akka “Reactive design patterns” “Principles of reactive programming” (et al) Roland Kuhn

5. John De Goes ● scalaz ● decent talks

6. Daniel Spiewak ● cats ● decent talks

7. Eric Meijer ● C# and LINQ ● Reactive extensions ● Haskell “Principles of reactive programming” (et al)

8. Learning resources Scalacenter https://scala.epfl.ch Exercises by “47 Degrees” https://www.scala-exercises.org Coursera - free courses Scastie https://scastie.scala-lang.org Awesome scala https://github.com/lauris/awesome-scala

9. Tools, Libraries and frameworks

10. IDE IntelliJ IDEA Eclipse/ScalaIDE Emacs + Ensime

11. Play framework Full-fledged web framework: ● Http handling ● Templates ● Json ● Dependency injection ● WebSockets ● SQL databases access - slick or anorm

12. Akka* Actor-based distributed platform ● Akka-actors ● Akka-streams ● Akka-http ● Alpakka

13. Unit testing Honorable mentions ● Scalatest ● Specs2 ● Scalacheck ● Scalamock ● Mockito

14. Cats You are enlightened! From OO-world into shiny functional programming Typeclasses everywhere Semigroups, functors and monads awaiting

15. Cats ecosystem Do the job in a functional way ● fs2 ● Http4s ● Circe ● Doobie ● Hammock ● cats-effect Free book - “Scala with Cats” https://underscore.io/books/scala-with-cats

16. ScalaZ Where Scala FP has started ● Category theory implemetation ● Streams ● ZIO and effects Pay what you want book - ”Functional Programming for Mortals” https://leanpub.com/fpmortals

17. Shapeless Advanced generic programming Let the compiler do the boilerplate for you! ● Polymorphic functions ● HList - tuples on steroids ● Discriminated unions - “either for more then 2” ● Lenses ● Many more

18. And many more

Scala ecosystem - Dublin Scala Meetup, Oct 2018

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