Answer to question on SO http://stackoverflow.com/questions/29461926/how-to-transfer-data-from-nsarray-to-string-in-swift/29469719

TableViewController

//
//  MasterViewController.swift
//  HackerNewsTitles
//
//  Created by Jan Gregor Triebel on 06.04.15.
//  Copyright (c) 2015 Jan Gregor Triebel. All rights reserved.
//

import UIKit

class MasterViewController: UITableViewController {

    var titles = [Int]()

    override func awakeFromNib() {
        super.awakeFromNib()
        
        refresh()
    }
    
    func refresh() {
        
        let baseURL = "https://hacker-news.firebaseio.com/v0/topstories.json"
        
        if let url = NSURL(string: baseURL) {
            
            let taskURL = NSURLSession.sharedSession().dataTaskWithURL(url, completionHandler:
                { (data: NSData!, response: NSURLResponse!, error: NSError!) -> Void in
                    
                    if error != nil {
                        println("NSURL-Error: \(error.localizedDescription)")
                    } else {
                        var jsonError: NSError?
                        if let topStories = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &jsonError) as? [Int] {
                            
                            self.titles = topStories
                            
                            self.tableView.reloadData()
                            
                        } else {
                            println("JSON-Error: \(jsonError)")
                        }
                    }
            })
            
            taskURL.resume()
        }
    }

    // MARK: - Table View

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 1
    }

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return titles.count
    }
}