Which of these is an appropriate syntax for dispatching a heavy operation to a background thread?

What is the name of the deinitializer in a Class declaration?

Which of these is an appropriate syntax for declaring a function that takes an argument of a generic type?

Which of these is not a valid property declaration in Swift?

Which is the wrong definition of a protocol in Swift?

Which of the following structures has both computed and stored properties?

What is the value of test in this code? var test = 1 == 1

What is the value of y? let x = ["1", "2"].dropFirst() let y = x[0]

What is this code an example of? let val = 5; print("value is: \(val)")

Why is dispatchGroup used in certain situations?

What is the raw/underlying type of this enum? enum Direction {case north, south, east, west}