If you need to have two items in an array change places, the
swapAt() method is exactly what you want: provide it two indexes inside your array, and the items at those positions will be swapped.
For example, consider this array:
var names = ["Paul", "John", "George", "Ringo"]
If I wanted John and Paul to swap places, I’d swap positions 0 and 1, like this:
swapAt() will trigger a fatal error if you try to swap beyond the length of the array.
Available from iOS 8.0
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