`foo?.bar` and `foo?['bar']` syntax would work too.
However the using both current `?` `:` operator and `?.` might be very
confusing on the same line.
e.g. using `?.` and `?['prop']`
```js
var a = { x: { y: 1 } };
var b = condition ? a?.x.?y : a?.y?.z;
var c = condition ? a?['x']?['y'] : a?['y']?['z'];
```
as opposed to double dots `..` and `..['prop']`
```js
var a = { x: { y: 1 } };
var b = condition ? a..x..y : a..y..z;
var c = condition ? a..['x']..['y'] : a..['y']..['z'];
```
##### Which one does look more clear to you?
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