Shuffle Array

Array Shuffle.swift

extension Array {
    func shuffled() -> [T] {
        var list = self
        for i in 0..<(list.count - 1) {
            let j = Int(arc4random_uniform(UInt32(list.count - i))) + i
            swap(&list[i], &list[j])
        }
        
        return list
    }
}

// Example

let arr = [1, 2, 3, 4, 5, 6]

println(arr.shuffled()) // -> [6, 3, 1, 5, 4, 2]
println(arr.shuffled()) // -> [5, 2, 1, 4, 6, 3]
println(arr.shuffled()) // -> [2, 3, 4, 6, 5, 1]