gistfile1.txt

// What does this program print?

import Foundation

for (var i = 0; i < 5; i++) {
    let delayTime = dispatch_time(DISPATCH_TIME_NOW, Int64(1 * Double(NSEC_PER_SEC)))
    dispatch_after(delayTime, dispatch_get_main_queue()) {
        print(i)
    }
}

NSRunLoop.currentRunLoop().runUntilDate(NSDate(timeIntervalSinceNow: 5.0))