anchor.diff:  // MongoDB connection
   var _mongoDb;
   
  -// World Collection
  +// world Collection
   var _worldCollection;
   
   // Fortunes Collection
   var _fortuneCollection;
   
  -// World table size
  +// world table size
   const _WORLD_TABLE_SIZE = 10000;
  -// Fortune table size used only for generation of data
  +// fortune table size used only for generation of data
   const _FORTUNE_TABLE_SIZE = 100;
   
   final _RANDOM = new Random();
   
  -class Fortune implements Comparable<Fortune> {
  +class fortune implements Comparable<fortune> {
     int id;
   
     String message;
   
  -  Fortune(this.id, this.message);
  -
  -  compareTo(Fortune other) => message.compareTo(other.message);
  -}
  -
  -class World {
  +  fortune(this.id, this.message);
  +
  +  compareTo(fortune other) => message.compareTo(other.message);
  +}
  +
  +class world {
     int id;
     int randomnumber;
   
  -  World(this.id, this.randomnumber);
  +  world(this.id, this.randomnumber);
   
     toJson() => { "id": id, "randomnumber": randomnumber };
   }
  
positive.code:   
    return _fortuneCollection.find().toList().then((fortunes) {
      fortunes = fortunes.map((fortune) {
        return new Fortune(fortune["id"], fortune["message"]);
      }).toList();
      fortunes.add(new Fortune(0, 'Additional fortune added at request time.'));
      fortunes.sort();
      return fortunesView(connect, fortunes: fortunes);
    });
  
negative.code:     return connection
        .query('SELECT "id", "randomnumber" FROM "world" WHERE id = @id;', { 'id': _RANDOM.nextInt(_WORLD_TABLE_SIZE) + 1 })
        .single
        .then((row) =>new world(row[0], row[1]))
        .whenComplete(() {
          connection.close();
        });
  