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ReactAdvanced#hooks#performance
ReactIntermediate#hooks#refs
What is useRef used for?
useRef holds a mutable value in a box that survives re-renders without causing them. It is used for DOM access, storing timers or previous values, and holding non-render data.
Example
const inputRef = useRef(null);
useEffect(() => inputRef.current?.focus(), []);
return <input ref={inputRef} />;