What is the main advantage of optional chaining?

Which feature in the list below does Swift not support?

Which of the following is a valid overriding operation in Swift?

What is the name of the following type of range in Swift?

1. ..<someValue

2. someValue…

3. …someValue

Which type of computed property in Swift cannot have a property observer added to it?

What is the conventional naming practice for a protocol in Swift?

What will be the output of the following lines of code?

struct Test {

var x: Int = 0

mutating func mutatingFunction() {

x += 1

}

}

let test = Test(x: 10)

test.mutatingFunction()

print(test.x)

What will happen if you run the following lines of code?

class OtherClass {

}

class SomeClass {

unowned let reference: Any? = nil

}

How do we interpolate the values of variables in a string in Swift?

What will be the output of the following lines of code ?

func arithmeticMean(_ numbers: Double...) -> Double {

  var total: Double = 0

  for number in numbers {

  total += number

  }

  return total / Double(numbers.count)

}

print(arithmeticMean(1,2,4,5,9,8,7954546))

The options are:

1: For error 2: For the output 1136367.857142857