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  • How to shuffle an array

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    Hi all,

    Shuffling an array means randomly re-arranging the content of an array .Shuffling algorithm can be used in many places now days like in card games, music player , media player etc.

    Shuffling of an array can be done in two ways.

    • Using GameplayKit framework but it is only for iOS 9.0 or above. For Example:-
    let unShuffledArray = [Int](1...100)
    var arr:AnyObject = [0,0]
    if #available(iOS 9.0, *) {
         arr = GKRandomSource.sharedRandom().arrayByShufflingObjectsInArray(unShuffledArray)
    }
    print(unShuffledArray)
    print(arr)
    • Using native code function.For Example:-
    func convertToShuffledArray<T>(var array: Array<T>) -> Array<T>
    {
         for var index = array.count - 1; index > 0; index--
         {
                let j = Int(arc4random_uniform(UInt32(index-1)))
                swap(&array[index], &array[j])
          }
          return array
    }

    an above function can be used as following:-

    let unShuffledArray = [Int](1...100)
    print("strings: \(convertToShuffledArray(unShuffledArray))")

    Thanks for reading.

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