Require type and protocol for method parameter

Question

I am playing around with Swift and am stumbling over the following problem: given I have the predefined class Animal:

//Predefined classes
class         


        

Answer 1

<> is in Objective-C: conforms to protocol

<> is in Swift for generics

You can do more with the where keyword

Use where after the type name to specify a list of requirements—for example, to require the type to implement a protocol, to require two types to be the same, or to require a class to have a particular superclass.

Excerpt From: Apple Inc. “The Swift Programming Language.” iBooks.