How to get a random element from an array using randomElement()
Swift’s arrays, sets, and dictionaries have a randomElement() method that returns one random item from the collection. Because your collection might be empty, the return type will be optional and you’ll get back nil if the collection had nothing in it.
For example:
let numbers = [100, 80, 85]
if let winner = numbers.randomElement() {
print("The winning number is \(winner).")
}Available from iOS 8.0
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