In Swift if I do: ``` class A { var b = B() } ...

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[mzgreen]

In Swift if I do:

class A {
    var b = B()
}

class B {
    var value = 5
}

let a: A? = A()

let foo = a?.b.value // I don't have to put ? after b and whole expression has Int type

In Kotlin I would have to do val foo = a?.b?.value and the whole expression would be an Int?. Is any of these approaches better? And why if so?