Domain Modeling Made Functional

Wed, Sept. 25th @ 09:00 AM (Workshop)

Functional programming and domain-driven design might not seem to be a good match, but in fact functional programming can be an excellent approach to designing decoupled, reusable systems with a rich domain model. This workshop will show you why.

This will be a hands-on workshop designed for beginners in F#. We'll do lots of domain modeling exercises starting with some simple models and then enhancing them with constraints, state machines, error handling, commands and events, and so on.

We'll cover these topics in detail:

  • The core concepts of functional programming and how they can be applied to Domain Driven Design
  • How to represent the nouns and verbs of a domain ("the ubiquitous language") using types.
  • Why representing the domain model using types is better than most other documentation (hint: it can never get out of sync)
  • How to capture constraints and business rules in the domain model itself instead of being buried in the implementation
  • How to represent state transitions
  • How to treat errors as a part of the domain
  • How to build a complete business workflow from smaller components using composition

The F#er's Functional Programming Toolkit

Check back soon for scheduling!

The techniques and patterns used in functional programming are very different from object-oriented programming, and when you are just starting out it can be hard to know how they all fit together.

In this talk for F# beginners, I'll present the most common tools that can be found in a functional programmer's toolkit: tools such as "compose", "reduce", "map", "return", "apply", and "bind". What are they? Why are they important? How are they used in practice? And how do they relate to computation expressions and scary sounding concepts like monoids, monads, and functors?

This talk is Bunny level

About Scott Wlaschin

Scott Wlaschin

Scott Wlaschin is a .NET developer, architect and author. He has over 20 years experience in a wide variety of areas from high-level UX/UI to low-level database implementations. He loves learning programming languages, his favorites being Smalltalk, but also Prolog, Python, and more recently, F#, which he blogs about at