Instruction

Inheritance

Swift has a preference for structs. It recommends you start by using a struct until you need some feature that’s only available for classes. Inheritance is one of these features — it only works with classes.

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Polymorphism

A subclass could also have methods that are relevant and useful for that specific classification. You can override a method in the parent class to do something different, such as using additional properties. Polymorphism translates to “many forms”. It occurs when each subclass object invokes its own version of a method, giving it many forms. You don’t need to write branching code to specify the object’s behavior; each object knows exactly what to do.

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