const Effects = () => { const [count, setCount] = useState(0); useLayoutEffect(() => console.log("chaque rendu 1")); console.log("chaque rendu 2"); useEffect(() => console.log("chaque rendu 3")); return ( <> {count} <button onClick={() => setCount((prevProps) => ++prevProps)}> Incrémenter </button> </> ); }; export default Effects; // 1 rendu: // Après clic: const Effects = () => { const [count, setCount] = useState(0); const [number, setNumber] = useState(0); useEffect(() => { console.log(count); return () => { console.log(count); }; }); return ( <> {count} <button onClick={() => setCount((prevProps) => ++prevProps)}> Incrémenter </button> </> ); }; export default Effects; // 1 rendu: // 2 1 3 // Après clic: // 2 1 3 // return null: // 2 1 3 // // 1: 1, 0 // +: 1, 2 // ++: 2, 2