finalkeyword do, and why would you want to use it?
Suggested approach: Think about the underlying goal here: why would you want to say “you cannot inherit from this class”? Is that a good idea? There are good reasons for using it – sometimes a class does something very precise, and you really don’t want users to override important parts of your code.
Estimated difficulty: Easy
deferkeyword in Swift?
guardkeyword in Swift?
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