anchor.diff:    return Future.wait(new List.generate(queries, (index) {
         return _mongoQuery()
             .then((world) {
  -            world["randomnumber"] = _RANDOM.nextInt(_WORLD_TABLE_SIZE);
  +            world["randomNumber"] = _RANDOM.nextInt(_WORLD_TABLE_SIZE);
               return _worldCollection.update( { "_id": world["_id"] }, world)
                   .then((_) => world);
             });
  
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();
  
negative.code: 
    World(this.id, this.randomnumber);
  
    toJson() => { "id": id, "randomNumber": randomnumber };
  }
  
  main() {
  