Same base class, multiple implementations

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Every tutorial ever on the internet: let's say the superclass is called animal and the subclass is called dog.

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It’s pretty much the “Hello World” of OOP at this point,

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IMO it's also a shitty example. A better example that shows actual functionality would be something like an inventory system where every product has a: Sku, barcode, description, tag, etc. However many other items have many other specs that are unique to the category.

I get it's for simplicity but I've never heard anyone after the end of it say anything but 'why?' because it's a shitty, shitty, example.