let array = Array(someSet)

let mySet = Set(["a", "b", "a"])  // Set<String>
let myArray = Array(mySet)        // Array<String>
print(myArray) // [b, a]

init<S>(_ s: S) where S : Sequence, Element == S.Iterator.Element

let stringSet = Set(arrayLiteral: "car", "boat", "car", "bike", "toy")
let stringArray = Array(stringSet)

print(stringArray)
// may print ["toy", "car", "bike", "boat"]

let stringSet = Set(["car", "boat", "bike", "toy"])
let stringArray = stringSet.sorted()

print(stringArray)
// will print ["bike", "boat", "car", "toy"]

let stringSet = Set(arrayLiteral: "car", "boat", "car", "bike", "toy")
let stringArray = stringSet.filter { $0.characters.first != "b" }

print(stringArray)
// may print ["car", "toy"]

let intSet = Set([1, 3, 5, 2])
let stringArray = intSet.flatMap { String($0) }

print(stringArray)
// may print ["5", "2", "3", "1"]

let intSet = Set([1, 3, 5, 2])
// alternative to `let intArray = Array(intSet)`
let intArray = intSet.map { $0 }

print(intArray)
// may print [5, 2, 3, 1]

var example:Set = ["a","b","c"]
let makeExampleArray = [example.sorted()]
makeExampleArray

["a","b","c"] or ["b","c","a",] or ["c","a","b"] or ["a","c","b"] or ["b","a","c"] or ["c","b","a"]

for item in myItemSet {
   ...
}

let itemsArray = myItemSet.sorted()

let itemsArray = myItemSet.map { $0 }

var itemsArray : [MyObjectType] = []
if let typedSet = myItemSet as? Set<MyObjectType> {
 itemsArray = typedSet.map { $0 }
}

extension Set {
    var array: [Element] {
        return Array(self)
    }
}

let array = set.array

func getArrayFromSet(set:NSSet)-> NSArray {

return set.map ({ String($0) })
}

var letters:Set = Set<String>(arrayLiteral: "test","test") // your set
print(self.getArrayFromSet(letters))