Swift Advanced Quiz 3

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Quiz 3
1. A way to define methods that can be called on a protocol itself.
2. Used to make a closure execute after the scope exits.
3. Defining an initializer that may return nil.
4. Ensuring that a class is the only instance.
5. Used to define a generic function.
6. Defining a method that takes a variable number of parameters.
7. A collection type that only contains unique items.
8. Defining a custom subscript.
9. Used to observe property changes.
10. Accessing a value safely.
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