The Reflex Architecture (Combo Workshop)

schedule May 14th 01:45 - 03:15 PM place Red Room people 29 Interested

This workshop needs some pre-setup as I'll only have 5 thumbdrives with vms on them. It's around 3GiB to download with virtualbox/docker and about 700MiB with nix: https://github.com/qfpl/reflex-realworld-workshop/blob/master/SETUP.md.

Reflex-dom is a remarkably awesome way to write frontend web applications in Haskell. Reflex DOM is built from Functional Reactive Programming (FRP) primitives defined in a library called Reflex.

Writing apps in reflex-dom is a little weird at first because it's a whole brand new paradigm to structuring your programs. Just like the jump from imperative programming to FP, jumping into FRP is a tricky process of rewiring your brain to fit the new model of thinking. It can be very difficult to appreciate the power and architectures that you can from this transition while you are still learning the basics, which naturally makes it difficult to be motivated to put in the work.

In this workshop we will implement parts of the "real world demo", a demo blogging application designed as a way to test frontend frameworks with things like backend calls and frontend routing. There will be a lot of skeleton and example code already written and be very directed, so it's -- as with the talk -- it is going to be more getting a high level feel than learning all of the fundamentals. It is the hope that the fast paced guided intro will allow you to do the rest of the learning at your own pace later.

 
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Target Audience

Frontend deveopers that feel like another fundamental upgrade is needed. Anyone that wants to live the dream of fullstack haskell apps!

Prerequisites for Attendees

  • You will need a laptop. It's ideal to have an internet connection, but following the guide will mean that you'll do the big downloads before the workshop.
  • Follow the instructions here to get a VM, docker image or set it up with nix: https://github.com/qfpl/reflex-realworld-workshop/blob/master/SETUP.md
  • You may prohibitively struggle if you aren't used to programming with Functor/Applicative/Monad/Foldable/Traversable/Monoid.
  • Having some exposure to mtl type constraints will definitely help.
schedule Submitted 3 months ago

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    Sean Chalmers / Jack Kelly - Property Base Your State Machine (Combo Workshop)

    90 Mins
    Workshop
    Intermediate

    PREPARATION - A clone or copy of this repository https://github.com/qfpl/state-machine-testing-course/ and completion of the initial setup steps contained therein.

    Types are great, but in most languages we use, they can't cover everything.
    Testing tries to fill that gap. Property-based testing generates bizarre
    examples and finds minimal reproductions that break your tests - a significant
    improvement over writing test cases by hand. But what if you have a thorny
    stateful system to test?

    State Machine Testing extends property-based testing to randomly test stateful
    systems. The actions performed against the system are modeled as commands, and
    the usual property-based test machinery, generates test cases, and shrinks
    failing tests to their minimal counter-examples.

    In this workshop we will build on the earlier talk and begin building up a state-machine test suite for a small imperative system.