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JavaScript Errors and Defensive Control Flow Quiz

Check your understanding of throwing, catching, cleanup, error categories, causes, and defensive boundaries.

10 questions ~8 min Intermediate

Knowledge check

JavaScript Errors and Defensive Control Flow Quiz

Check your understanding of throwing, catching, cleanup, error categories, causes, and defensive boundaries.

Stuck? Each question has an optional hint.
Skip a hard question and review it before your results.
Questions and answer options can shuffle between attempts.

You can retake this quiz whenever you like.

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What does throw produce?

throw produces a throw completion.
When does catch execute?

catch handles a throw completion from the protected try evaluation.
What is finally commonly used for?

finally provides completion-independent cleanup.
Why use Error cause?

cause preserves the lower-level error while adding context.
Why create an Error subclass?

Subclasses provide recognizable categories.
What does AggregateError represent?

AggregateError carries an errors collection.
What does Error.isError test?

It checks the language Error object model.
What is good when a layer cannot recover?

Unrecoverable failures should reach an appropriate boundary.
Why avoid return in finally?

finally completion can replace an earlier return or throw.
What is defensive error handling?

Defensive design preserves failure meaning and ownership.

Back to lesson Next: JavaScript Promises