My first @scaladays.org just finished. Thanks to all the people who attended my talk and took some time to chat with me 🙏 There are a lot of engineers, data scientists, front-enders, and students who do extraordinary things using #Scala every day, and are the heart of our community 💕. Thank you all

Version 0.5.0 of the #YAES effect system is here 🚀 (just in time for @scaladays.org...fiuuu). We added the `State[S]` effect to the #Scala 3 party 🥳. However, be careful that the current version is not thread-safe. Here are the release notes: github.com/rcardin/yaes...

I'm reading @sam-cooper.bsky.social's "Kotlin Coroutine Confidence". It's a masterpiece💫, even if you already know #Kotlin coroutine machinery: It's worth your money 💰: pragprog.com/titles/sckot...

#DropsOf #Kafka: It's possible to force an order on messages read by consumers from a topic by using the same key for all messages to be read in order. Naive, but effective in most cases 😜

#DropsOf #Kotlin: Kotlin was the first language on the JVM implementing continuation passing style (CSP) directly in the compiler 🚄. It rewrites every suspending function using CSP, adding a `Continuation` object to the parameters and rewriting the body accordingly 🪄

#DropsOf #Java: Checked exceptions were a good idea ✨. They are some form of an effect system. You know precisely what kind of effects a function performs. To eliminate the effect, you need to handle it, and the compiler forces this behavior. However, they don't compose with lambdas 🤷‍♂️

#DropsOf #kotlin: Do you know you can implement the race primitive 🚗 for coroutines in just one line of code? The `channelFlow` has its coroutineScope, and when the `first` function cancels the Flow execution, it cancels all the running coroutines that did not win the race. 😍

#Scala lovers, version 0.4.0 of the #YAES effect system is out!🚀 What a journey.🤪 The new `Resource` effect is here, and now you can even zip two different `Flow`. Wow, concurrent programming on flows! 🎉 Here are the release notes: github.com/rcardin/yaes...

Hey, #Scala lovers! I'll give a talk at the next @scaladays.org 2025 🎉. I still can't believe it 🤪. Let's meet in Losanna to share our experiences on direct-style and monadic effect systems! I'll bring my (on-going) knowledge about the former, with my library #YAES ⭐️ See you there 👋

Today, I talked at Ticino Software Craft 🧑‍🔬. We discussed #Scala Effect Systems, both monadic and direct-style (in detail, the #YAES effect system). It was a pleasure to join the Ticino software community. Thanks, guys, for the opportunity 🙏 www.youtube.com/watch?v=PEiM...

Save the date 📅! I will discuss #Scala and Direct-Style Effect Systems this Wednesday at the Ticino Software Craft meetup 🚀. See ya online 👋 www.linkedin.com/events/doyou...

On Wednesday, May 28th, I will join the team from Ticino Software Craft to share some knowledge and ideas about Effect Systems in #Scala ⭐. Everybody's welcome 👋. You can't miss it 💯 www.linkedin.com/events/doyou...

Hello folks 👋 ScalaIO is back for another edition in 2025 🥳 🌐 It will be held at La Grande Crypte, Paris 🇫🇷 on the 17/10/2025 🎟️ Early birds tickets are already open to sales(f: Person => `scala.io`) 🤝 CFP & sponsorships will open very shortly See you soon 😊

Version 0.3.0 of the #YAES library just landed 🚀. No new effects this time, but the porting of the first bunch of methods of the #Kotlin `Flow` type! #Scala has flows now, and they compose well with YAES effects 🙌 Here are the release notes: github.com/rcardin/yaes...

Yesterday I played with the #YAES library to understand what is missing to gain RT. Guess what 🤔? Maybe I managed to introduce some form of RT in a #Scala direct-style approach. I need you 🫵 to join the discussion: github.com/rcardin/yaes... cc @scalatimes.com

Hey, #Scala devs! To celebrate the Liberation Day in Italy 🇮🇹(April 25th), here is a new version of the #YAES library! We added the `Log` effect that does what its name promises 😅 Keep on coding! 🙌 github.com/rcardin/yaes... @scalatimes.com

Someone tried to understand if #YAES can be successfully integrated into a Tagless-Final #Scala application 😍, and the pros and cons. I never thought someone would be interested in my library. I'm so excited 🎉

I’ve been #coding for almost 20 years in the “traditional” way. 💻 Now, it's time to give AI a chance. I use it in its basic form, such as Copilot. Can someone point me to some resources to implement a more complex and effective workflow? 🙏

Yo Dawg, Heard You Want To FlatMap Your Direct-Style by @rcardin.bsky.social Subscribe to our our YouTube channel so you don't miss the rest of #scalarconf videos.

#Scala Effect Systems' lovers 💕, version 0.1.0 of the #YAES library is out! 🎉 We added the `Clock` and the `System` effect. I know, not too much, but it's still honest work 😜 Check it out: github.com/rcardin/yaes... cc @scalatimes.com

The video of my talk at @scalar-conf.com is finally out! 🎉 In the talk, I live-coded a mini effect system using nothing but #Scala 3 context functions, building it up step by step. youtube.com/watch?v=TXUx... Thanks, @softwaremill.com, for this marvelous opportunity! 🙏

I'm trying to use phantom types 👻 to create an alternative definition of the Effect in #YAES. As you know, YAES is a #Scala Effect System trying to use something similar to direct-style (Capability Passing Style). Does anybody want to join the discussion? 👋 github.com/rcardin/yaes...

I'd like to build some libraries that are usable across #Java, #Scala & #Kotlin, but I also want to be free to pick my implementation language & libraries (Project Loom, Cats-Effect, Kotlin coroutines). This helps me expose nice APIs to all devs. Work in progress: github.com/funfix/tasks

On my way to Italy 🇮🇹. Again, thanks to @scalar-conf.com and @softwaremill.com for such a fantastic organization 👏. The talks had an extremely high quality 📈 See ya! Don't forget to leave a star ⭐ to my project, github.com/rcardin/yaes 🙏

The last day of the @scalar-conf.com is over. Oh boy, what an adventure. 🎉 Many thanks to all the people who work to make it happen 🙏 Thanks to @rockthejvm.com for being such a great mentor and friend. Thanks to Martin for all the rest 😜

Yesterday was such a roller coaster! 🎢 I did my first talk ever to @scalar-conf.com, which was terrific. 🎉 Here is the deck: github.com/rcardin/scal... If you are there, let’s meet 🤩

Will there be any Italian 🇮🇹 🤌 🍝engineers at @scalar-conf.com? Let’s meet in Warsaw in about 1 week 🎉

In #YAES, the Async effect lifts a #Scala program to the structured concurrency world. 🚀 We have Fibers to have complete control over the concurrency, but we also provided the standard primitives 🧱 like `race`, `pair` and `racePair`. github.com/rcardin/yaes...

Welcome @warski.org as a next #Scalarconf speaker! Production-ready direct-style Scala Grab your ticket 🛒 sml.io/tickets #scalar #scala #itconference #functionalprogramming

📣Hey, #Scala devs. It's a pleasure my last fatigue: #YAES, a shiny new Effect System library implementing Algebraic Effects. What's different with YAES? Well, you can use a for-comprehension or a capability passing style! 😱 github.com/rcardin/yaes/ See you at the @scalar-conf.com 👋

Here is AI technology that addresses the heart of complex domains, which is where DDD sits. And we don't need to speculate much. Even the LLM technology we have today creates exciting possibilities. Watch this talk: buff.ly/3ZxFOL2 and join us for more at DDD Europe 2025!

🏔️ @scaladays.org Call for Proposal is now open! Deadline to submit your ideas ⏳ 6th of April 2025, 11:30 PM GMT scala-lang.org/blog/2025/03...

It's an honor to share the stage with so many awesome engineers and developers 🤩 I still can't understand how it's even possible. See you in Warsaw!

TDD be like: - I found a bug, and I know how to fix it - But I have to write a test case first - But I have to refactor existing tests first - But I have to write a test utility first - But I have to write a test case for the test utility first - The tests I'm refactoring have bugs too

I wrote up a case study on designing a DSL for terminal interaction. You might find it a good read if you like to see programming theory jargon (codata! monads! composition!) tied to actual use cases. noelwelsh.com/posts/codata...

Do you know that #Scala `Console.println` can't fail with an IOException? It uses #Java `PrintStream` under the hood, and in case of failure, it does so silently. Here is why (it was a design decision): stackoverflow.com/questions/29...

Welcome @romanowski-kr.bsky.social as the next #Scalarconf speaker! How Scala is made and how you can help? Grab your ticket 🛒 sml.io/tickets #scala #functionalprogramming

Thanks for sharing the updates of the #Raise4s library ❤️

#FP hasn't taken over the world yet, as its observable benefits are more subtle, essentially forcing people into proven best practices. Examples: - Clear & observable state modeling; - Testing outputs, not side effects; - Forcing resources to be params (clear deps & lifecycles).

Welcome Riccardo Cardin as the next #Scalarconf speaker! Yo Dawg, Heard You Want To FlatMap Your Direct-Style Grab your ticket 🛒 sml.io/tickets #scala #functionalprogramming #directstyle

Nothing to see here, definitely not a great opportunity for Scala devs. www.reddit.com/r/scala/comm...

A good test should tell us a short story, not drag us through a murder mystery. - Venkat Subramaniam #quotes #quoteoftheday

Java Conferences with closing CFP in the next 15 days: JDConf Closes: 17 January 2025 JPoint Closes: 14 January 2025 Devoxx France Closes: 12 January 2025 Devoxx UK Closes: 10 January 2025 JCON OpenBlend Slovenia Closes: 10 January 2025

#Java architects are so coherent in implementing the new JDK's features 😎. In structured concurrency, thread canceling is still based on Thread interruption. All the parent-child relationships are tailored around it. Cooperative scheduling, the Java way 🙌. rockthejvm.com/articles/str...

Victor Rentea - Unit Testing like a Pro: The Circle of Purity https://www.youtube.com/watch?v=1Z_h55jMe-M

Language Wars 2024: #Python Leads, #Java Maintains, #Rust Rises

released ifdef 0.4.0, a Scala compiler plugin that implements conditional compilation in #Scala ifdef 0.4.0 features - helper sbt plugin cross published to sbt 1.x and 2.0.0-M3 - typo fix of the sbt key name `ifDefDeclarations` eed3si9n.com/ifdef-0.4.0

The better way to close 2024 is with version 0.5.0 of the #Scala #Raise4s library! 🎉 Now, you can enable tracing and print the exact place where an error was raised 😱. In addition, we added integration with Scalameta mUnit 🙌 cc @scalatimes.com github.com/rcardin/rais...

Welcome @kubukoz.mstdn.party.ap.brid.gy as the next #Scalarconf speaker! All the projects I didn't finish, and why it was worth it Grab your ticket 🛒 sml.io/tickets #scala #functionalprogramming

#Java Project Loom introduced the `ShutdownOnFailure` structured policy. It's easy to implement the `par` structured concurrency primitive using it 🥳 Check it out in my last article on the @rockthejvm.bsky.social blog! 🚀 rockthejvm.com/articles/str...