Suggested approach: Extensions add functionality to specific data types, e.g.
Int. Protocol extensions add functionality to protocols, for example all kinds of integers at the same time –
UInt64, and so on.
For bonus points you could go on to talk about how protocol extensions enable protocol-oriented programming.
Estimated difficulty: Intermediate
guardkeyword in Swift?
finalkeyword do, and why would you want to use it?
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