Wait for multiple async calls and do something after that (Swift)

async-calls

let url = NSURL(string: "https://www.google.net")
let request = NSURLRequest(URL: url!)
let group = dispatch_group_create()

for index in 1...100 {
    dispatch_group_enter(group)
    NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) {(response, data, error) in
        println("\(index) complete")
        dispatch_group_leave(group)
    }
}

dispatch_group_notify(group, dispatch_get_main_queue()) {
    println("All tasks are done")
}