[b123400]

While I agree that many things can be simplified into functions, I would like to point out functional languages don't necessary means you are going to have cleaner code automatically.

I write Haskell for a company that it seems people here like to experiment with extensible-effects-interpreters-whatever pattern, that we end up with some 81 "effects-model-repository-handlers-command-query" packages in a project, the FactoryCommandQueryEffectContextGeneratorRepositoryHandlers type is not limited to Java.

The main reason behind this kind of code seems to be "what if you need <insert a property here>?". As other comments pointed out, using a class over function can help caching the result, save / restore the state, share the state and so on, but do we need these properties? The author is talking about a homework, it's not a piece of code that you run on some very important production servers, there's no need to cache / save / restore or whatever. What if you need it in the future? Update the code.

I somehow start to think maybe this kind of mindset is inevitable in a project's lifetime, until people are confident enough to say "If we need this need code to be cachable / restorable / whatever, give me time, and I can update the code."