Hypothetical question: What happens if you add a new genre and you don’t want the default banner to be returned?
What I’m getting at is that it’s much safer to throw in a default. Or if it’s typescript it’s safer to return a never type. That way you can exhaustively consider enum values or any union of types. I describe that technique here.
Good point, for sure a switch statement should have a default.
I didn't include it in this case for brevity, and this is just an example. For something slightly more evolved I would actually resort to the factory pattern to create my return types and simplify the creation logic even more
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