We've closed the first round of applications for the Scalar Call for Papers!

We'll be announcing the first speakers for the 2026 edition very soon!

In the meantime, check out our #myscalastory series at sml.io/myscalastory, featuring insights from top Scala and functional programming experts!

A new month, a new version of #YAES 🥳 Version 0.8.0 finally introduces the `YaesApp`. Now, you can develop your direct style #Scala app, and Yaes will take care of the execution of most of the effects 🙌

Plus, we redesigned Channels and added overflow policies! 💪

github.com/rcardin/yaes...

#Scala Effects lovers, here is the Halloween 🎃 release of #YAES. We introduced Channels in the library. Now, fibers can communicate asynchronously through message passing 📨. #Kotlin Channels heavily inspired the feature.

Here are the release notes: github.com/rcardin/yaes...

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 👋

YouTube video by Ticino Software Craft Do You Even Handle Effects?

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...

Do you even handle effects? | LinkedIn Scala’s effect systems have come a long way from Monix and Scalaz, to Cats Effect, ZIO, and now Ox and Kyo. The debate between monadic and direct styles is at its peak or maybe, it doesn’t have to be ...

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...

Do you even handle effects? | LinkedIn Scala’s effect systems have come a long way from Monix and Scalaz, to Cats Effect, ZIO, and now Ox and Kyo. The debate between monadic and direct styles is at its peak or maybe, it doesn’t have to be ...

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...

Scala.IO Scala.IO is a conference for people having interest in the Scala ecosystem or simply being curious about the language, usages

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

From the scala community on Reddit: YAES: Thoughts on context-based capability passing style for state threading and integration into tagless-final application Explore this post and more from the scala community

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? 🙏

YouTube video by SoftwareMill Yo Dawg, Heard You Want To FlatMap Your Direct-Style by Riccardo Cardin | Scalar Conference 2025

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

YouTube video by SoftwareMill Yo Dawg, Heard You Want To FlatMap Your Direct-Style by Riccardo Cardin | Scalar Conference 2025

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! 🙏

Find a different effect definition, something like `Yaes[Random & Raise[E]] ?=> A` · Issue #19 · rcardin/yaes Find a different effect definition, something like Yaes[Random & Raise[E]] ?=> A.

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...

GitHub - funfix/tasks: Task datatype, meant for cross-language interop (Java, Kotlin, Scala) Task datatype, meant for cross-language interop (Java, Kotlin, Scala) - funfix/tasks

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 😜

GitHub - rcardin/scalar-2025: Slides' Deck for the Scalar 2025 Conference Slides' Deck for the Scalar 2025 Conference. Contribute to rcardin/scalar-2025 development by creating an account on GitHub.

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 🎉