import Foundation

var a = Array<Int>()
var na = NSMutableArray()
for _ in 0 ... 1_000 {
    a.append(0)
    na.addObject(0)
}

let array = Array(a)
let nsArray = NSArray(array: na)

var startArray = NSDate()
for _ in 0 ... 1_000_000 {
    let _: NSArray = array;
}
print("Array to NSArray:", fabs(startArray.timeIntervalSinceNow) * 1000, "msec")

startArray = NSDate()
for _ in 0 ... 1_000_000 {
    let _: Array = array;
}
print("Array to Array:", fabs(startArray.timeIntervalSinceNow) * 1000, "msec")

for _ in 0 ... 1_000 {
    let _: Array<Int> = nsArray as! Array<Int>;
}
print("NSArray to Array:", fabs(startArray.timeIntervalSinceNow) * 1000, "msec")

startArray = NSDate()
for _ in 0 ... 1_000 {
    let _: NSArray = nsArray;
}
print("NSArray to NSArray:", fabs(startArray.timeIntervalSinceNow) * 1000, "msec")