Question

Swift language:
Explain the concept of optional-chaining to print "megaPixel" value of camera by using the following example code only
struct Person {
var name: String
var phone: Phone?
}
struct Phone {
var camera: Camera?
}
struct Camera {
var megaPixel: Int
}

Answer 1

sorry too big

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Answer 2

Answer:

struct Person {

var phone: Phone?

}

struct Phone {

var camera: Camera?

}

struct Camera {

var megaPixel: Int = 40

}

var cand = Person()

cand.phone = Phone()

if let megapixel = cand.phone?.camera?.megaPixel {

print("MexaPixel value is \(megapixel)")

}

else {

print("MegaPixel value of Camerae cannot be retreived")

}

Explanation: