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  • I depend on external services. Each one need to be call on a specific service. It is related to our customer internal architecture/information system. Even if I do not create a doStuffWithFoo, I will need to process a collection of Foo so in any case the switch will be done somewhere. Commented Mar 22, 2022 at 10:27
  • I know polymorphism can do it for me at run time, but only if I place my business logic inside my object. If I want to place it outside, then I do procedural programing and polymorphism do not apply. It is what I understood by reading about Anaemic vs Rich domain model thanks to @Philip Kendall reply. I also understand having 2 functions doing the same thing but with different implementations seems to be irrelevant. Actually it is but it is not on my scope, I need to deal with it :/ Commented Mar 22, 2022 at 11:12
  • Ok, I think I see your problem and may be able give you an example how to approach this. Commented Mar 22, 2022 at 11:31
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    Where do you decide which of the instances (Bar, Baz) to create? If a conditional check should be anywhere, it should be confined there. What's the reason you didn't implement doStuff() directly in Bar and Baz? "doStuff is business logic and not class behavior" - what do you mean? High-level class behavior (which is different from implementation details of a function) should be an expression of the business logic, that's the whole point. Commented Mar 23, 2022 at 0:22
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    To me, this hinges on the details of the actual case -- in what ways are the operations in doStuff the same/different between Bar/Baz instances? What is the Foo interface? etc. IMHO, Just thinking about the problem in the abstract won't lead to a conclusion. Commented Mar 23, 2022 at 17:32