Overview
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 functional programming. You'll do lots of exercises and build some small projects that take you all the way from high-level design to low-level implementation.
By the end of the workshop you'll know how to build working solutions with rich domain models, using only functional programming techniques.
Outline
Overview of DDD Principles
- Building a shared model and representing it in code
- Persistence ignorance
- Domain modeling with AND/OR
Introduction to Functional Programming
- Functions and types
- Composition as the fundamental principle
Domain Modeling with Algebraic Types
- Records, choices, simple types, and functions
- Modeling constraints, options
- Making illegal states unrepresentable
- Modeling states
Error Handling
- Handling domain errors
- Railway oriented programming
- Composing error generating functions with bind (monads!)
- Validation
Functional Architecture
- Keeping IO at the edges
- DTOs versus Domain objects and how to transform between them
Programming a Complete Workflow
- Putting it all together
Requirements
You will be using F# as your development language. No experience with F# needed. Please install the F# compiler and an F# friendly editor such as Visual Studio Code using the instructions at fsharp.org or ionide.io.
About The Trainer
Scott has over 20 years experience in development, design and architecture covering all aspects of business software. He is the creator of F# for Fun and Profit and the book 'Domain Modeling Made Functional'.
He is an excellent communicator and is comfortable with the "soft" skills that many developers dislike, including being a business analyst, writing documentation, interfacing with non-techies, and generally being a champion for the user experience.
