What is Navigator.pushAndRemoveUntil() in Flutter?
Why Interviewers Ask This
Interviewers ask this to evaluate whether you have the depth of knowledge needed to mentor others and lead technical decisions. The expected answer goes beyond definitions into practical implications and real-world consequences.
Answer
Navigator.pushAndRemoveUntil() navigates to a new route and removes all existing routes from the stack that satisfy a given predicate. To clear the entire stack: Navigator.pushAndRemoveUntil(context, MaterialPageRoute(builder: (_) => HomeScreen()), (route) => false). This is used after logout (to clear the authenticated stack before showing login), after completing an onboarding flow, or after a payment confirmation where you do not want the user to navigate back to intermediate screens.
Pro Tip
This topic has Flutter-specific nuances that differ from general programming. Highlighting those nuances in your answer shows expertise rather than generic knowledge.