Safe Navigation Operator “?.” for D2 ?

[Araq]

>
> You have other parts of the OO paradigm as well, which I would 
> consider more important:
>
> 1. Combining data (instance variables) and behavior (methods) 
> as a single entity (object)
>

That's an ADT then, not OOP. (I follow Cook's definition of OO 
here.)

> 2. Encapsulation and information hiding

That's a module system, not OOP.