While I was refactoring my app’s state recently, I noticed that there are virtually no dev logs about The Archive and how I manage state and events in this app. It’s my largest app so far, still the amount of reflection and behind-the-scenes info is pretty sparse. This post outlines my recent changes to the app’s state. It’s a retelling of the past 5 weeks or so.
Instead of writing view model types that expose the input and/or output ports as properties, consider writing free functions that are the transformation. This reminds me of Ken Scambler’s proposal to get rid of test doubles through side-effect free function composition. One of his examples, simplified, goes like this: Instead of testing what customer.pay(amount, wallet) does in your tests by mocking the wallet object, you rewrite Wallet as a value object and change pay to return the effect.