What is the meaning of the '#' mark in swift language

Question

I have seen code like this:

func hello(name: String, #helloMessage: String) -> String { 
    return \"\\(helloMessa         


        

Answer 1

With previous versions of Swift everything what @ovejka posted was true. In Swift 2.0 and above it looks like # is unused (in this or similar context, not counting #available)