import Foundation

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

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")

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

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