Speaker Deck

Domain Driven Design with the F# type System -- F#unctional Londoners 2014

by Scott Wlaschin

Published March 13, 2014 in Programming

Statically typed functional programming languages like F# encourage a very different way of thinking about types. The type system is your friend, not an annoyance, and can be used in many ways that might not be familiar to OO programmers.

Types can be used to represent the domain in a fine-grained, self documenting way. And in many cases, types can even be used to encode business rules so that you literally cannot create incorrect code. You can then use the static type checking almost as an instant unit test — making sure that your code is correct at compile time.

In this talk, we'll look at some of the ways you can use types as part of a domain driven design process, with some simple real world examples in F#. No jargon, no maths, and no prior F# experience necessary.

Code, links to video, etc., at http://fsharpforfunandprofit.com/ddd

NEW AND IMPROVED - added sections on:
* why OO, not FP is scary
* designing with states and transitions