what does "->" mean in swift?

Question

I was following a Swift tutorial, and in a function it is declared as:

func clamp (min: CGFloat, max: CGFloat, value: CGFloat) -> CGFloat{}

what does -> mean?

Answer 1

That is called the return arrow and indicates that the function returns a value, whose type follows the ->. It is optional (along with the type that follows it) if the function returns no value.

More info at Defining and Calling Functions