London Scala User Group

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 to discuss the talks!

🌐 This event has a live stream. Join the webinar here 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 .
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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 and we'll get you started
🏡 Interested in hosting or supporting us? Please get in touch through this form and we can discuss how you can get involved.
📜 All London Scala User Group events operate under the Scala Community Code of Conduct.
We encourage each of you to report the breach of the conduct, either anonymously through this form 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.

Frequently Asked Questions
I am a novice Scala developer, is this the right event for me? 📚
Yes! One of the best ways to improve your Scala skills is by working on Open Source library and projects!
If you're completely new to Scala / programming, ScalaBridge is a great way to get started!

I don't know what projects I should contribute to.. ↔️
We have a list of Scala projects that would love to have some contributions. Other than get-work-done libraries, we have cool projects like game engine, frontend framework, synthesiser!

I have an idea for a Open Source project but it's a bit daunting. Can you help? 🏔️
Yes! We'd love to see more open source Scala projects and contributors! We can help you get started and provide technical guidance whenever you need it.

I can't find SirusXM's office!
The address of the building is 37 High Holborn (Meetup.com sometimes incorrectly display it as 36)
The entrance to the building is right next to Vision Express:
https://imgur.com/a/Q422P85

SiriusXM/Adswizz office is 1st floor in the building.
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📜 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 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.

————————————————————
🗣️ 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 and we'll get you started
🏡 Interested in hosting or supporting us? Please get in touch through this form 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 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.

Are you going to Scala Days ?

🚂 Let's make the trip together on the Scala Days Train Jam!

Join fellow Scala developers and hack on projects on the train. The train jam starts at London, goes via Paris, and ends at Lausanne.

If you're a frequent traingoer or just taking your first steps in sustainable travel, the train jam is the journey for you!

Agenda ​

• 8:15 Assemble at St Pancras
• 9:31 Take the Eurostar to Paris
• 12:58 Arrive in Paris and head to Gare de Lyon
• 14:18 - Take the TGV to Geneva
• 17:29 - Arrive in Geneva
• 17:54 - Leave Geneva
• 18:37 - Arrive in Lausanne 🎉

Questions
How much is the train fare?
If you book now, it’ll be roughly £230 - £250 depending on whether you’re booking a return.

How do I book tickets?
Read our guide for train jammers for a step by step booking process. ​

Is there Wifi on the train?
Yes! There’s Wifi and generally good signal on the Eurostar, TGV, and in Gare de Lyon, where we’ll spend most of our journey.

What will we jam on?
Whatever you like! Along the way we’ll contribute to OSS projects, or hack on fun and interesting ideas.

I’ve never taken the train in Europe. Is it hard?
Not at all! Taking the Eurostar and TGV is very smooth. The difficult bit is booking tickets (see How do I book tickets? above). The most tricky part of our journey is crossing Paris via the metro, and we'll do that as a group.

Why are you going a day early?
We’re going in time for the Scala Days workshops and Scala Bridge. If you’re not attending either of these, we strongly encourage you to spend the day hacking together, or to join in other events. ​

I want to go by train, but can't take this one. Are there other trains I can take?
Of course, although you might not be with other jammers. Our guide for train jammers has some alternative journeys already planned out.

📜 All London Scala User Group events operate under the Scala Community Code of Conduct.
We encourage each of you to report the breach of the conduct, either anonymously through this form 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.