What are the advantages and disadvantages of using the Optional chaining operator in code?

Advantages of Optional chaining:

• Allows safe access to nested optional values without the need for multiple unwrapping (if let or guard).
• Code becomes more concise and readable.
• If any element in the chain is nil, the entire chain returns nil, preventing crashes.

Disadvantages of Optional chaining:

• Can hide problems if nil is unexpected — the absence of an error can make debugging harder.
• If different actions are needed for nil and non-nil, Optional chaining is not suitable, as it simply returns nil.
• Sometimes leads to excessive use of optionals, complicating logic.

Example usage:

class Person {
    var residence: Residence?
}

class Residence {
    var numberOfRooms = 1
}

let john = Person()

// Without Optional chaining:
if let roomCount = john.residence?.numberOfRooms {
    print("Number of rooms: \(roomCount)")
} else {
    print("Room information is unavailable")
}

Here, john.residence can be nil, and Optional chaining allows safe access to numberOfRooms.