How to randomize the order of an array: shuffle() and shuffled()
Swift has built-in methods for shuffling arrays: shuffle() and shuffled(), depending on whether you want the shuffling to happen in place or not.
For example:
var albums = ["Red", "1989", "Reputation"]
// shuffle in place
albums.shuffle()
// get a shuffled array back
let shuffled = albums.shuffled()Available from iOS 8.0 – see Hacking with Swift tutorial 2
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