← You've been deep-cloning objects with a JSON hack. `structuredClone` does it right.Quiz
structuredClone vs the JSON hack
Six questions on what structuredClone actually preserves versus JSON.parse(JSON.stringify(obj)) — Dates, Maps, Sets, circular references, class instances, and the transfer option.
questions6
pass mark70%
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No account needed. Every answer is explained as you go, with a reference to the spec or MDN — pass and you can claim a certificate.