simple nsurlsession playground

nsurlsession.swift

import UIKit
import XCPlayground

XCPlaygroundPage.currentPage.needsIndefiniteExecution = true

NSURLSession.sharedSession().dataTaskWithURL(NSURL(string: "http://www.cocoanutmobile.com")!)
    { data, response, error in
        guard error == nil else {
            print(error?.localizedDescription)
            return
        }
        guard let data = data else {
            print("No data")
            return
        }
        let str = NSString(data: data, encoding: NSUTF8StringEncoding)
    }.resume()