A way to prevent properties to be added to an object if they are null or undefined.

[Rodrigo Carranza]

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> I was about to hit send on a post also suggesting a helper function, but after thinking about it a bit more, Rodrigo's suggestion resembles extending the optional chaining proposal
> https://github.com/tc39/proposal-optional-chaining<https://github.com/tc39/proposal-optional-chaining>
> into the object literal notation. I suggest using the same character pair, "?.", as is proposed for optional chaining, instead of just "?".
> ```js
> let ret = {
>     couldBeNull?.,
>     bar?.: couldBeNull
> }
> ```
>
> The helper function might be best in the case where an empty string value needs the same treatment as null or undefined.

That proposal is awesome, but I think the real operator here is the `?`, in combination with the chaining operator `?.` but it could be anything with the same semantics `?:` for objects `?.` for chaining `?=` for assignment `??` binary comparison. Just like in Dart but with extended functionality.

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