Functional Programming

When building backend services, it is very easy to start with the framework. Create the controller. Generate the database entity. Add the repository. Then somewhere between HTTP requests and database tables, try to find a place where the business logic fits. I have built many systems this way. It works. Until it doesn’t. Over time I have started moving in the opposite direction: Start with the domain. Everything else is just an adapter. ...

A practical introduction to Railway-Oriented Programming in Kotlin using Arrow’s Either. Learn how to replace exception-driven business logic with explicit, composable error handling.

A talk by Scott Wlaschin changed the way I think about error handling and composing business logic in Kotlin.

Functional programming didn’t change the language I use. It changed the way I think about designing software.