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| extension Array { | |
| var shuffled:[Element] { | |
| var clone = self | |
| for index1 in 0..<count { | |
| let index2 = Int(arc4random_uniform(UInt32(count))) | |
| guard index1 != index2 else { continue } | |
| swap( &clone[index1], &clone[index2] ) | |
| } | |
| return clone | |
| } | |
| } |
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