What does ?. do in Dart?

Question

What does "?." syntax do in Dart language? I have here an example from Flutter's scaffold.dart code:

_drawerKey.currentState?.open();

Answer 1

It's a null safe operator.

Use ?. when you want to call a method/getter on an object IF that object is not null (otherwise, return null).

_drawerKey.currentState?.open();

Call open() only if it's not null.

More info: https://medium.com/@thinkdigitalsoftware/null-aware-operators-in-dart-53ffb8ae80bb