Quiz 5
1. A way to define methods that can be implemented differently.
2. Used to prevent a class from being subclassed.
3. Defining a custom operator's precedence.
4. Accessing elements in a collection using square brackets.
5. Used to define a property that doesn't hold memory.
6. Used to define a custom type that holds a single value.
7. A way to create a thread-safe property.
8. Defining a method that can take a variable number of arguments.
9. Used to observe property changes from an external source.
10. Using an initializer that might fail.
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