Swift Optionals and `nil`
Optionals play a crucial role in Swift programming. They allow us to handle situations where a value may or may not be present. By declaring a type as optional, we indicate that it may contain a value or be absent. To declare an optional, we add a question mark (?) after its type. For example: var value: Int? = 10 In this case, value is not directly an Int but an optional that wraps an Int value....