hard20 pts · first answer countscross-platform-mobiledart

Sealed classes and exhaustive switch

A `sealed class PaymentState` has three subclasses: Idle, Loading and Failed. A switch expression handles only Idle and Loading. What happens?

A.Failed values silently fall through and return nullB.The analyzer reports a compile error because the switch is not exhaustiveC.It compiles, and a runtime error appears only when Failed occursD.Dart automatically adds a default branch that returns Idle

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Sealed classes and exhaustive switch

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