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I like Bernhardt's rendition of this concept too. His talk "Boundaries" is my favourite summary: https://www.destroyallsoftware.com/talks/boundaries https://ww

by theptip 10y ago

I like Bernhardt's rendition of this concept too. His talk "Boundaries" is my favourite summary: https://www.destroyallsoftware.com/talks/boundaries https://www.destroyallsoftware.com/talks/boundaries Note that the Functional Core architecture makes an additional restriction on top of the Clean/Hexagonal architecture, namely that the core should be functional; the OP doesn't make such prescriptions on how you implement the Entities and business logic (though it doesn't discourage you from doing so either of course).

RubenSandwich 10y ago
You are right that the above article doesn't specifically mention the core being functional. I merely interpreted that from one of the stated properties of his and the other architectures he showcases: "2. Testable. The business rules can be tested without the UI, Database, Web Server, or any other external element." If that doesn't scream functional, then I don't know what does. :)