Name: Scala Talks: Modern CLIs with Scala Native & Routing Http Requests with Scala 3
Start: 2025-06-18T18:00:00+01:00
End: 2025-06-18T21:00:00+01:00
Location: The Trade Desk

🎉 Come along to the London Scala Talks! 🎉
In this event you'll hear from Noel Welsh and Anton Sviridov.

**Agenda**
6:00pm - 🥤 Doors open. Come along and grab a drink!
6:40pm - 🗣️ Noel Welsh: Routing Http Requests with Scala 3
7:20pm - 🍕 Intermission: Join us for some free food and drinks! Vegan, vegetarian and gluten-free options are provided. Let us know if you'd like something special - we'd be happy to accommodate.
7:50pm - 🗣️ Anton Sviridov: Modern CLIs with Scala Native
8:30pm - 🥤 Socialising: Grab a drink and let's discuss the talks.
9:00pm - 🍻 Join us in [The Butcher's Hook and Cleaver pub](https://maps.app.goo.gl/xm52SeqQPQwB8Nqh6) to discuss the talks!

🌐 **This event has a live stream. Join the webinar [here](https://thetradedesk.zoom.us/j/99428287189) at 6:40PM.**

🗣️ **Noel Welsh: Routing Http Requests with Scala 3**
Request routing is the problem of choosing a function to invoke based on a HTTP request. All but the simplest web frameworks include routing, but that doesn't mean that routing isn't an interesting problem. I set out to design a request routing library that was all of:

* compositional;
* type safe;
* reversible, meaning clients can be constructed from a route; and
* a delight to use, with great error messages.

Doing requires some interesting design decisions. We'll discuss FP versus OO representations, finite state machine builders (which are a lot simpler than this name implies!), using Scala 3's tuple types for greater type safety and convenience, and designing for dot-driven development. Along the way I'll discuss other routing libraries that made different decisions, to help illustrate the design space and the tradeoffs that can be made.
Did I succeed? Well, you can decide. Either way, I think the journey is interesting and you should learn something you can apply to your own coding.

⭐ Noel Welsh ⭐
Noel is a developer, teacher, and author. He's worked with companies big and small across Europe, the USA, and even once in Africa. He's the organizer of ScalaBridge London, a diversity focused group helping people get better at Scala. When he's not programming Scala he is probably writing about it. His next book, Functional Programming Strategies, is out soon!

🗣️ **Anton Sviridov: Modern CLIs with Scala Native**
In recent years we have seen dramatic changes in the quality of CLI tools we use – many familiar tools have been rebuilt from scratch in new languages, with new interfaces, and colourful output. That shift has in turn raised the expectations for any new tool, shunning complex dependencies, unintuitive interfaces, and difficult distribution methods.
With Scala Native, I believe we have a strong contender in the space of modern CLIs, we just need to build parts of ecosystem that have long been neglected due to low usage of Scala in the world of CLIs.
Join me as I talk in detail about my experience building an important CLI for myself, the libraries I've built along the way, and the improvements I desperately want.

⭐ Anton Sviridov ⭐
Scala enthusiast, open source contributor, and blog author. Worked in Data Science, distributed systems, and programming language tooling. Recently I have been diving deeper into systems programming languages and the lessons we can learn from them to be applicable to Scala Native.

**Frequently Asked Questions**
***I can’t get into The Trade Desk!***
To attend our event hosted by The Trade Desk you will need to be registered with the building. Please provide your name and email address when registering.
Before the event, you’ll receive an email from “One Bartholomew” titled “Your appointment at One Bartholomew”. If this is your first time at The Trade Desk, you will need to fill in an online form. Following this, you will be sent a QR code.
On arrival, enter the building and scan the QR code at the barriers to access and see the lift on the display (A-F). The lift will send you to the 10th floor.
After exiting the lift, make your way to The Trade Desk reception.
You can find detailed instructions [here](https://docs.google.com/document/d/1o3rJid89IVRxIQ48CIQv0a0Q5H-9UK4f5E1_YSYcBYY) .
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🗣️ Would you like to present, but are not sure how to start? Give a talk with us and you'll receive mentorship from a trained toastmaster! Get in touch through [this form](https://forms.gle/zv5i9eeto1BsnSwe8) and we'll get you started
🏡 Interested in hosting or supporting us? Please get in touch through [this form](https://forms.gle/3SX3Bm6zHqVodBaMA) and we can discuss how you can get involved.
📜 All London Scala User Group events operate under the [Scala Community Code of Conduct](https://www.scala-lang.org/conduct/).
We encourage each of you to report the breach of the conduct, either anonymously through [this form](https://forms.gle/9PMMorUWgBnbk1mm6) or by contacting one of our team members. We guarantee privacy and confidentiality, as well as that we will take your report seriously and react quickly.

Zainab Ali

London Scala User Group

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Scala Talks: Modern CLIs with Scala Native & Routing Http Requests with Scala 3

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Scala Talks: Modern CLIs with Scala Native & Routing Http Requests with Scala 3

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