matejcerny 8 months ago

There's a good chance you have already used contramap (e.g. when creating a Circe encoder), but understanding the concept can be challenging. This article explains it using a practical example. #scala

A Developer's Experience

Understanding Contramap

A contramap is defined as the converse of the map. I have never been satisfied with the definition. In this post, I will explain the concept in a w...

matejcerny 8 months ago

jsoniter is known as one of the fastest JSON libraries. The latest patch version significantly boosts codec derivation! There are also other new features, such as support for simple opaque types and named tuples. https://www.reddit.com/r/scala/comments/1ng3cn3/meet_new_release_of_jsoniterscala_with_much/ #scala

matejcerny 8 months ago

A nice little Scala 3 badge you can add to your repository 👇 #scala

matejcerny 8 months ago

Sad news, ScalaIO announced its last conference! 😥 Another signal to all of us to put our internal conflicts aside or soon there will be no community left to fight over. https://www.reddit.com/r/scala/comments/1nfznuj/scalaio_organization_latest_news/ #scala

matejcerny 8 months ago

Ok, this MVC framework looks really incredible! It's built on top of http4s but with a focus on developer happiness and productivity. 👏

Architecture

docs

#scala

matejcerny 8 months ago

The importance of making illegal states unrepresentable is even greater in the age of AI agents! 🤖

matejcerny 8 months ago

What is your convention for handling errors: YOLO, full-on defensive, or a separate Either channel?

Random Scala Tip #534: Adopt an Error Handling Convention for `Future` - Daniel Beskin

When working with `Future` be explicit about your error handling convention, and make sure your whole team and codebase are aligned to it.

#scala

matejcerny 8 months ago

So refreshing to read a post about enriching the Scala community, not leaving it! An example of making the ecosystem better for everyone ❤️ #scala

Silva Bytes

Chez: A Scala Library for JSON Schemas, OpenAPI Spec generation & building AI Apps

A brief disclaimer I’m still relatively new to Scala, I picked up Scala around 2 years ago and have not been able to put it down. I built a care...

matejcerny 8 months ago

Good news for those who like to write spaghetti code 😂 #kotlin

Kotlin Help

What

Read the Kotlin 2.2.20 release notes covering new language features, updates to Kotlin Multiplatform, JVM, Native, JS, and Wasm, and build tool sup...

matejcerny 8 months ago

Even though the concept of context functions is pretty simple, I'm still not used to them 🤷 #scala

Nicolas Rinaudo - Effects as Capabilities

matejcerny 8 months ago

I would really appreciate an IntelliJ version just for Scala, without all the Java bloatware. #scala #java

matejcerny 8 months ago

Scala 3.7.3 is out! 🎉 It features a compiler lint that helps when you use a default value for a using parameter and there is also an explicit given in the scope. Also, enum items hashcode is now stable. #scala

Scala 3.7.3 is now available!

matejcerny 8 months ago

"Notably, around 20% of attendees were new to Scala" 😳 #scala

Scalac - Software Development Company - Akka, Kafka, Spark, ZIO

Scala Days 2025 Recap - a Scala community reunion

Scala Days 2025 Recap: Discover key insights on Scala 3, AI, and Akka from Lausanne. The future of tech and community growth.

matejcerny 8 months ago

ZIO+Tapir+Quill combo template with CRUD operations, authentication, routing, pagination, monitoring and more. AKA type-safe, purely functional alternative to the Spring Boot ecosystem. #scala #zio

GitHub

GitHub - softwaremill/realworld-tapir-zio: RealWorld.io with tapir and ZIO

RealWorld.io with tapir and ZIO. Contribute to softwaremill/realworld-tapir-zio development by creating an account on GitHub.

matejcerny 8 months ago

I know Scala is not Haskell, but imagine Haskell introducing direct style to lower the initial learning curve...

matejcerny 8 months ago

A new minor release of Scala.js features bug fixes, performance improvements and support for some new JDK methods! 🎉 #scala

Scala.js

Announcing Scala.js 1.20.1

Harness the Scala and JavaScript ecosystems to develop robust apps for browsers, serverless, and Node.js.

matejcerny 8 months ago

Custom error types in the cats IO without monad transformers! Made possible by the new MTL 1.6.0 release 🎉 #scala https://typelevel.org/blog/2025/09/02/custom-error-types.html

matejcerny 8 months ago

Another sad story about a Scala developer moving away from the language. What is even sadder is how accurate the article is. #scala https://arbuh.medium.com/why-i-am-moving-away-from-scala-7a9d3dca17b9

matejcerny 8 months ago

My apologies, it turns out the description I was looking for is actually on the landing page! 👍 #scala View quoted note →

matejcerny 8 months ago

One would think that in the official Scala toolkit there would be the most widely used libraries. Yet I haven't used MUnit, uPickle, and Cask in my whole career. #scala