swift4RandomizeArray.swift

import Foundation

extension Array {
    mutating func randomize() {
        for i in 0..<self.count {
            let r = Int.random(in: 0..<Int(self.count - i))
            (self[i], self[i+r]) = (self[i+r], self[i])
        }
    }
}

var intArray:[Int] = (0..<99).map{$0}
var stringArray:[String] = (0..<25).map{String(Character(UnicodeScalar(Int(("A" as UnicodeScalar).value) + $0)!))}
var stringArray2:[String] = "jmangia".map{String($0)}

print(intArray)
print(stringArray)
print(stringArray2)

intArray.randomize()
stringArray.randomize()
stringArray2.randomize()

print(intArray)
print(stringArray)
print(stringArray2)