code: public  static <T> T at(int i, T[] args)
  	{
  		if(args == null || i < 0)
  			return null;
  		
  		if(i>= args.length)
  			return null;
  		
  		return args[i];
  	}
docs: Get element by index
  @param <T> the input type
  @param i the index
  @param args the input argument
  @return the object at the index