Which is correct for the following codes?

class Country{ let name: String init(name: String){ self.name = name; } var city: City? } class City{ let name: String init(name: String){ self.name = name; } var country: Country? } var bangladesh: Country? var khulna: City? bangladesh = Country( name: "Bangladesh" ) khulna = City( name: "Khulna" ) bangladesh?.city = khulna khulna?.country = bangladesh bangladesh = nil khulna = nil

Which keyword is used to declare an extension in Swift?

Which of the following statements is true when talking about classes and structures in Swift?

How could we extend String to conform to protocol MyProtocol? Answers:

Which keyword do you use to define a protocol?

Which of these statements declares cityArray as a mutable array?

Which integer literals have a decimal value of 17?

Correct way to declare Decomposed Tuple?

How do you remove items from arrays?

What are the Numeric Integer Literals?

Correct answer for Enumerations?