shuffled.swift

extension CollectionType {
    func shuffled() -> [Generator.Element] {
        var source = Array(self)
        var result : [Generator.Element] = []
        while !source.isEmpty {
            let index = Int(arc4random()) % source.count
            result.append(source[index])
            source.removeAtIndex(index)
        }
        return result
    }
}

[1,2,3,4].shuffled()
["key1":1, "key2":2, "key3":3].shuffled()