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Wednesday, December 14, 2022

[FIXED] What does ?. do in Dart?

 December 14, 2022     conditional-statements, dart, flutter, syntax     No comments   

Issue

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

_drawerKey.currentState?.open();

Solution

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



Answered By - Kent
Answer Checked By - David Marino (PHPFixing Volunteer)
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