How to get random element from a set in Swift?

Question

As of Swift 1.2, Apple introduces Set collection type.

Say, I have a set like:

var set = Set(arrayLiteral: 1, 2, 3, 4, 5)
         


        

Answer 1

extension Set {
    func randomElement() -> Element? {
        return count == 0 ? nil : self[advance(self.startIndex, Int(arc4random()) % count)]
    }
}