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

let string = String()

print(string.isEmpty)

What is the syntax for single-line and multi-line comments in Swift, respectively?

Which of the following is an invalid operation in Swift?

What will be the output of the following Swift code?

func test(_ label: String) -> String {

 return "Hello" + label

}

What will be output of the following line of code ?

let string = "String"

print(#"The output will be \(string).”#)

What happens if the programmer does not provide a body for a function declared in a protocol?

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

let greeting = "Guten Tag!"

for index in greeting.indices {

 print("\(greeting[index])", terminator: ".")

}

What will be the output of the following Swift code?

let name: String? = nil

if let someVar = name {

  print(someVar)

} else {

  print("There is nil in optional")

}

What are the default integer values associated with the cases of the following enumeration in Swift?

enum CompassPoint {

 case north

 case south

 case east

 case west

}

What will be the output of the following code?

var airports: [String: String] = ["YYZ": "Toronto Pearson", "DUB": "Dublin"]

airports["LHR"] = "London Heathrow"

for (airportCode, airportName) in airports {

  print("\(airportCode): \(airportName)")

}