What does Underscore “_” before variable name mean for Flutter

Question

with reference to the Flutter tutorial, I encountered an underscore, _.

I know that in Java, _ is used as a naming convention for a private

Answer 1

From the Dart guide

Unlike Java, Dart doesn’t have the keywords public, protected, and private. If an identifier starts with an underscore (_), it’s private to its library. For details, see Libraries and visibility.