This is an AI generated text, an answer to a ChatGPT question that is just too interesting to throw away.
Projections: Creating Read-Optimised Data
Data continuously flows through organisations, and on its way, it's transformed many times to serve different purposes. Functional design emphasises data transformation—projections— rather than repeatedly mutating state in a single database. One particularly useful form of projection is the creation of read-optimised data structures tailored to well-defined use cases.
Code structure – The House Metaphor
In a legacy system, what is it that you spend absolutely most time on? I would say, understanding code and finding out where to do a change. Most of us have been in the situation that we spend hours or days looking for exactly one single line that would be changed in a million line code base.
Unit testing with F#
I recently heard about a project where the code was written in C#, but where they implemented the unit tests in F#. They did so because they wanted to learn and evaluate F# in a protected environment. I thought that sounded like a very good idea and wanted to try.
Letter to the coding newbie
Dear Newbie, I know you struggle a bit with your new role and how to become a successful professional programmer. I think the best would be if I just told you, already now at start, what you need to know!
Unit testing – Provide flexible data
As a DDD (Domain-Driven Development) person, I like to be able to read the code as I read a book. This is of course very hard, but something that I strive for. Therefore I often use the builder pattern for unit tests.
What is business logic?
I found it rather common that developers have only a vague idea of what business logic is. I also sometimes find it hard to describe it myself, even though I've spent many hours of my career working with it.