← Stop Losing Promise Errors. `unhandledrejection` Catches Them.Quiz
unhandledrejection: catching swallowed promise errors
Check what actually stuck about silently failing promises: why they don't reach window.onerror, what the unhandledrejection event gives you, its rejectionhandled companion, and what the listener does and doesn't fix.
questions8
pass mark70%
resultsat the end
No account needed. Answer all 8 questions, then see your score with every answer explained and a reference to the spec or MDN — pass and you can claim a certificate.