medium10 pts · first answer countsreacteffectsevents

Cleaning up a window listener in an effect

Which effect correctly adds and removes a keydown listener?

A.add (e) => onKey(e); return () => remove (e) => onKey(e)B.add onKey in the effect; remove it in a separate effectC.const h = (e) => onKey(e); add h; return () => remove hD.add onKey; no cleanup, since React removes it

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Cleaning up a window listener in an effect

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