swiftでシャッフル関数 - Qiita

func shuffle<T>(inout array: [T]) { for var j = array.count - 1; j > 0; j-- { var k = Int(arc4random_uniform(UInt32(j + 1))) // 0 <= k <= j swap(&array[k], &array[j]) } } func shuffled<S: SequenceType>(source: S) -> [S.Generator.Element] { var copy = Array<S.Generator.Element>(source) shuffle(&copy) return copy }