swanky closures and defaults

why-swift-is-pretty.swift

import UIKit
import Foundation


// how to make it
func timing(name: String, start: NSTimeInterval = NSDate().timeIntervalSince1970)() {
    println("\(name): \(NSDate().timeIntervalSince1970 - start)")
}


// how to use it
let x = timing("sup")
x()

output:

sup: 0.004318[...]