Swift return type clarification

Question

I see a Swift function written as follows:

func calculation(imageRef: CGImage) -> (red: [UInt], green: [UInt], blue: [UInt]) {

 ...
 ...
}

Answer 1

This method return a tuple

func calculation(imageRef: CGImage) -> (red: [UInt], green: [UInt], blue: [UInt]) {


    return ([],[],[])
}