Millist käitumist oodatakse, kui deklareerite muutuja user, kasutades nõrka viidet weak var user = User()?

In Swift, declaring a variable with weak var user = User() creates a weak reference to the User object. This means that the reference does not increase the object's reference count, and if there are no strong references to this object, it will be deallocated (removed from memory).

In this case, if user is the only reference to the User object, then immediately after creating the object, it will be released, and user will become nil.

Example:

class User {}

weak var user = User() // user will immediately become nil, as there are no strong references

print(user) // nil

Therefore, weak references are usually declared as optional (weak var user: User?) and are used to prevent retain cycles, for example, in delegates.