What is the purpose of the two arrows in the user defined chooseStepFunction() in Swift?

Question

What do the double arrows indicate in the return type of the last function here?

Are they used to indicate two different return values?

If so, how do you kno

Answer 1

The -> (Int) -> Int in

func chooseStepFunction(backwards: Bool) -> (Int) -> Int{
return backwards ? stepBackward: stepForward
}

means that the function returns a function that takes an Int as a parameter, and also returns an Int.

You can see it as func chooseStepFunction(backwards: Bool) -> [ (Int) -> Int ] {