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

In swift 3

extension Set {
    public func randomObject() -> Element? {
        let n = Int(arc4random_uniform(UInt32(self.count)))
        let index = self.index(self.startIndex, offsetBy: n)
        return self.count > 0 ? self[index] : nil
    }
}