Domain Modeling Made Functional

Great book and workshop followed with Scott Wlaschin

Workshop notes

Source code

https://github.com/swlaschin/DmmfWorkshop

Extra Material of the Workshop

• Four Candles -- comedy sketch with lessons for DDD
• Reinventing the transaction script (talk)
• Functional DDD

  • fsharpforfunandprofit.com/ddd
  • “Designing with Types” series on fsharpforfunandprofit.com
  • Serializing a rich domain model to a database, JSON, etc
  • Code from "Domain Modeling Made Functional" book
  • Evolving a DDD design: Microwave example project
  • Functional Domain Modeling (Scala Version)
• Learning F#

  • FSharpKoans
• F# Front end:

  • Elmish -- the Elm Architecture for F# frontends
  • There is a whole (excellent) book on using Elmish
  • Also https://compositional-it.com/blog/2017/09-21-safe-elmish/index.html
• F# web frameworks:

  • https://safe-stack.github.io/
  • Giraffe (uses ASP.NET core)
  • Suave (standalone)
• Working with JSON and databases

  • Serializing your domain model -- how to share algebraic data types with the outside world
• Advanced F#

  • https://fsharpforfunandprofit.com/video/
  • Capability-based design talk and blog post
  • Map, apply, bind and “elevated” worlds
  • Cyclic dependencies are evil
• Event sourcing

  • Event Sourcing - Step by step in F#
  • FsUno - https://github.com/thinkbeforecoding/FsUno
  • A more advanced version of FsUno closer to what would be put in production
• Adopting FP in your company

  • Video: Adopting FP: A Human-First Approach -- how to ensure that new ideas work inside a company
• F# tips and example code

  • F# to C# interop tips
  • C# LINQ -> F# equivalents
  • “Effective F#” gist -- a lot of guidelines for developing in F#
  • DTO validation example
  • AsyncExample.fs -- some examples of Async
  • AsyncResult Workflow Template -- demonstrates async and result workflow
  • Utility.fs -- common classes like NonEmptyList, etc
  • Testutils.fs -- utilities for testing
  • Wrapping(simple) -- AWS + Json wrappers

To go further

Links for if you want to keep going after the workshop :

1. see the link at the bottom of the Google Docs file at

2. For C# compatibility, see code at: DmmfWorkshop/CSharpInterop

3. For monads and more, see slides: F-FP_toolkit.pdf code: DmmfWorkshop/src/F-ImplementingWorkflows/01-Exercises.txt

4. For capability-based design see: https://fsharpforfunandprofit.com/cap/ https://www.youtube.com/watch?v=fi1FsDW1QeY

Read his great book on the topic : Domain Modeling Made Functional