React 19 · State and effects
Run an effect
Run code after render, here when the id changes, and clean up before the next run.
useEffect(() => {
const sub = subscribe(id);
return () => sub.unsubscribe();
}, [id]);
Official React 19 documentation
React 19 · State and effects
Run code after render, here when the id changes, and clean up before the next run.
useEffect(() => {
const sub = subscribe(id);
return () => sub.unsubscribe();
}, [id]);
Official React 19 documentation
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