Scott Wlaschin

Domain Modelling with the F# Type System

Date: This event took place live on March 24 2015

Presented by: Scott Wlaschin

Duration: Approximately 90 minutes.

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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 webcast, 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.

About Scott Wlaschin

Scott has over 20 years experience in software development, design and architecture, covering all aspects of business software. He is the creator of the popular F# web site,, and has done many F# presentations at conferences and user-groups around the world.