Use closure of stored dictionary data

gistfile1.swift

import UIKit

class Demo: NSObject {
    func clojure() -> (index:Int) -> Dictionary<Int, Int> {
        var dict = [:] as Dictionary<Int, Int>
        var r = { (index:Int) -> Dictionary<Int, Int>  in
            dict[index] = index * 10
            return dict
        }
        return r
    }
}

let demo = Demo()
let x = demo.clojure()

x(index: 1)
x(index: 2)
x(index: 3)

// [1: 10]
// [2: 20, 1: 10]
// [2: 20, 3: 30, 1: 10]