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iOS Swift Closures Functions as First Class Citizens Capturing Variables

Adrian Yeow
Adrian Yeow
13,866 Points

Return Void

func printerFunction() -> (Int) -> () { var runningTotal = 0 func printInteger(number: Int) { runningTotal += 10 println("The running total is: (runningTotal)") } return printInteger } The () has shown that this function is returning void. If it's returning void, than why is return printInteger is required?

1 Answer

Hi Adrian,

In fact, printerFunction is not returning Void, it's returning a function that has one parameter of type Int, and that returns a value of type Void.

The second -> is part of the statement of printerFunction's return type.

Hope it helps.