Language Upgrades · interview question

In a pattern matching switch expression involving a sealed class hierarchy, how can you ensure that all possible subclasses are handled?

Multiple choiceHardchapter-12-curatedpremiumlanguage-upgradespattern-matching

Use reflection to dynamically check for subclasses at runtime.Use a default case to broadly capture all unhandled subclasses.Include a case for each subclass explicitly and avoid a default case.Rely on the compiler to automatically handle all subclasses.

Answer and explanation

Correct answer

C. Include a case for each subclass explicitly and avoid a default case.

Why

To ensure all possible subclasses in a sealed class hierarchy are handled, you should include a case for each subclass explicitly in the switch expression. This approach leverages exhaustiveness checking, which avoids the need for a default case.

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In a pattern matching switch expression involving a sealed class hierarchy, how can you ensure that all possible subclasses are handled?

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