Had a blast giving the talk "A tour of error handling" yesterday, where I explore how we can do typed error handling in Scala today. Here are the slides: github.com/jatcwang/tal...

🤖 Many teams don’t live in a Scala-only world. This session shares what it’s like to use Scala inside a Go-first company and where it shines. Check out "Using Scala in a Go-First Company" from Christian Hollinger

The festive season is upon us and we have something special... a Christmas social event on Dec 12th (Fri) at the Science Museum!! 🎄 Come for some drinks (free entry, sign up required) or Power Up and enjoy a night of fun retro games 🎮🤖 (£20). Details below 🧵

Our next #Scala #OpenSource Hack Night on Nov 19th (Wed) will be held at Medidata, starting at 6pm! Come and enjoy a night of fun hacking & learning! Sign up here: 🌟 www.meetup.com/london-scala...

Our next Scala Talks event is happening on Nov 12 (Wed) at Depop! We have some international speakers! Agnès Cardin will share her experience publishing a Scala book, and Maciej Gorywoda will show us how Jetbrain's AI tools can help you write Scala! Sign up here: www.meetup.com/london-scala...

A very educational post on current state of Scala typeclass derivation approaches, why it's bad, and how we can do better. kubuszok.com//2025/sanely...

Enjoy this multi-part series on builder pattern in Scala. Intro to Builder Pattern blog.rhetoricalmusings.com/posts/builder1 Know Your Limitations blog.rhetoricalmusings.com/posts/builder2 Errors Are UX Too blog.rhetoricalmusings.com/posts/builder3

@scalabridgelondon.bsky.social is back in October! Here's the projects we'll be working on: www.scalabridgelondon.org/projects/ Sign up for your choice here: docs.google.com/forms/d/e/1F... (All the details and much more on our website www.scalabridgelondon.org)

🚨You have until the 07/09 to book your regular tickets for ScalaIO ! 👉 scala.io#tickets But you can also buy late birds right now if you want 💰 🗣️For late-uploaders, the CFP is still open

sbt 2.0.0-RC3 is released! sbt 2.0 is a new version of sbt, based on Scala 3 constructs and Bazel-compatible cache system - Plugins published against sbt 2.0.0-RC3 will be bincompat with 2.x - All tasks are cached by default (transient annotation to opt-out) eed3si9n.com/sbt-2.0.0-RC3 #Scala

sbt 2.0.0-RC2 is released! sbt 2.0 is a new version of sbt, based on Scala 3 constructs, and Bazel-compatible cache system - Plugins published against sbt 2.0.0-RC2 will be bincompat with 2.x series - All tasks are cached by default eed3si9n.com/sbt-2.0.0-RC2 #Scala

Doing some benchmarks for Ox, using the excellent Kyo benchmark arena, which already has the code for Kyo, cats and ZIO. I've added Ox & Pekko to a couple of benchmarks - the results are varied. Ox holds well in streaming, in other areas the benchmarks often really test the JVM & virtual threads.

sbt 1.11.3 is released

We have two exciting live-coding talks for you this July! ☀️ Join us on Jul 23rd (Wed) 6pm to see some cutting edge Scala in action from Nicolas Rinaudo and Anton Svirdov! Sign up here: 👇 www.meetup.com/london-scala...

NEVER buy anything Adobe. Adobe is the example of what greed does to a company. No matter how outraged people are; no matter that the FTC is suing Adobe and executives for this practice; Adobe keeps doing it. I got scammed by this same practice in 2020 the same way: I switched to Affinity instead.

Our next #Scala #OpenSource Hack Night on June 25th (Wed) will be held at SiriusXM, starting at 6pm! Come and enjoy a night of fun, learning and friendship! Sign up here: 🌟 www.meetup.com/london-scala...

My first project written in @unison-lang.org ! gvolpe.com/blog/unison-...

Ready, steady, go! Scala Days 2025 program is here 😍 Functional Programming and the Real World 🏁 4 tracks 🗣️ 50+ speakers ♾ Infinite fun scala-lang.org/blog/2025/05...

Travel sustainably to @scaladays.org and enjoy the journey with the Scala Days Train Jam. Join fellow #Scala developers from London and Paris to hack on projects on the train. Find out more at www.meetup.com/london-scala....

Our next #Scala #OpenSource Hack Night on May 21th (Wed) will be held at SiriusXM, starting at 6pm! Come and enjoy a night of fun, learning and friendship! Sign up here: 🌟 www.meetup.com/london-scala...

Our next London #Scala Talks (Wed, Apr 16th) will be all about tooling! 🤩 Come and hear Li Haoyi introduce Mill, and Jędrzej Rochala with a fresh take on using Intellij for Scala! Big thanks to our host The Trade Desk! Don't miss out and sign up now! www.meetup.com/london-scala...

New video! James Ward on Effect Oriented Programming, writing code in the age of AI, good mental models, speaking at conferences and endless curiosity: youtu.be/M8DuVYnsW5A

Just added slides for my talk "Tagless Final for Humans" to my page of talks: noelwelsh.com/landing/talks/ I gave this talk today at @scalar-conf.com. The core is a new encoding for tagless final in Scala, which makes much better use of Scala's features than the standard encoding.

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

There's still a few spots left in our next #Scala #OpenSource Hack Night on March 26th (Wed) starting at 6pm, at Elsevier office! (Thanks @elsevierconnect.bsky.social!) Come and enjoy a night of fun, learning and friendship~ :) Sign up here: 🌟 www.meetup.com/london-scala...

New video, and this time I'm doing something different: a long-form, wide-ranging conversation with none other than Martin Odersky, the creator of #Scala! www.youtube.com/watch?v=tmpP...

Did you know, the CfP for this year’s conference is OPEN. Send in your proposal today and be part of this year’s event in Lausanne, Switzerland! ✍🏼 www.papercall.io/scaladays All levels of expertise on Scala and its application are welcome and encouraged 👍🏼

A great question -- and one that I used as a foundation for an entire talk speakerdeck.com/bcantrill/th...

The next online Scala Tooling Spree will be happening tomorrow! During the event, we will do our best to tackle some Metals and Scala CLI issues. The spree will take place from 17:00 to 19:00 CET. If you’d like to participate, please register use: forms.gle/yUurzS2KiM2....

Scalar agenda is ready! Check: scalar-conf.com website ...and see you in Warsaw in... 22 days Grab your ticket 🛒 sml.io/tickets #scalarconf #scala #itconference #functionalprogramming

hello #Scala. this account will mostly be used to post/retweet release information and blog posts www.scala-sbt.org

Yesterday I gave at talk at Imperial College on the uses of dualities in programming. We look at the dualities between data and codata, calls and returns, and ASTs and stack machines. Slides are at noelwelsh.com/landing/talks/ and the benchmarks are taken from github.com/scalawithcat...

Scala 3 will require JDK 17+, starting from Scala 3.8. This will enable the compiler and ecosystem to move faster and leverage new features and APIs. The decision is in line with similar decisions happening around the whole JVM world. Read about it at www.scala-lang.org/news/next-s...

Significant #scala announcement: after years of idle conversation, and a more-focused discussion over the past couple of months, the decision has formally been made to jump Scala 3's requirements up to JDK 17, as of the next LTS release: https://www.scala-lang.org/news/next-scala-lts-jdk.html

We are proud to announce that Typelevel is a Mentoring Organization for Google Summer of Code 2025!! Check out our blog post to learn more 🎉 typelevel.org/blog/2025/02...

You don't use such language unless you plan to transmit people's data to third parties without the user's knowledge. https://www.mozilla.org/en-US/about/legal/terms/firefox/#you-give-mozilla-certain-rights-and-permissions

Our next Scala talks will be on March 6th at Imperial College! Sign up here! www.meetup.com/london-scala... Don't forget about our #OpenSource hack this week on Feb 26th! (www.meetup.com/london-scala...) as well as ScalaBridge online on the 27th (www.meetup.com/scalabridge-...) See you there! 👋

Flattening a data structure can lead to a host of advantages both with respect to performance and ergonomics. This blog post demonstrates them by writing 2 interpreters - 1 that allocates recursive structures on the heap and one that flattens them out into an array www.cs.cornell.edu/~asampson/bl...

Time to meet again 🥰 🙌 Scala Days 2025 🗓️ 19-21 August 2025 📍Lausanne, Switzerland 🌐 Business-driven ♥️ Community-infused 🦸 Family-friendly Looking forward to welcoming you in August! scala-lang.org/blog/2025/02...

#Scala tooling spree is happening next week!

Hey! We are happy to announce that the second **online Scala Tooling spree** will take place on **Feb 20 at 17:00-19:00 CET**. During the Scala Tooling spree, we will be divided into teams, each tackling a chosen Metals or Scala CLI issue. (1/3)

I have a new blog post up: "Corporate 'DEI' Is An Imperfect Vehicle for Deeply Meaningful Ideals" charity.wtf/2025/02/10/c... I know a lot of people are feeling incredibly scared and demoralized right now. I get it; I am too. (Who knows if my marriage will still be valid in two years?)

toml-scala 0.3.0 is out: now with Scala 3 derivation! github.com/indoorvivant...

Our next #Scala #OpenSource Hack Night is happening on Feb 26th (Wed) starting at 6pm. Come and enjoy a night of fun, learning and friendship :) Sign up here: 🌟 www.meetup.com/london-scala...

Great job! 👏 And I agree that the Tuple.Map deserves more documentation and examples, as it's a powerful feature. #scala #migration https://blog.pierre-ricadat.com/scala-3-migration-report-from-the-field

TIL: S3 FIFO - a smart and efficient caching algorithm, invented in 2023: s3fifo.com

Over many years of explaining programming concepts to others, and learning them myself, I've realized that two different kinds of explanation are useful. I call them operational and denotational explanations and I've written them up here: noelwelsh.com/posts/operat...

So! It's been ages! For releases, 2024 was my 'lost' year as I slogged through the surprisingly hard problem of building a component UI system from scratch. But I'm pleased to announce a raft of new releases. If you want to do some weird stuff with #Scala, look no further..

We just merged a potentially large fix to Metals that should help with cases were metals would just stop compilation. You can test it out with the latest snapshot to see if it helps with stability in your project. (1/2)