Code Mosh React 18 Beginners Fco -

const [selectedMovie, setSelectedMovie] = useState(null); Pass setSelectedMovie as prop to child. Movie Ideas Tracker

⚠️ Always use a unique key . function DeleteButton( onDelete ) return <button onClick=onDelete>Delete</button>; code mosh react 18 beginners fco

React 18’s strict mode mounts/unmounts/mounts in dev – be aware. createRoot (instead of ReactDOM.render) index.js setSelectedMovie] = useState(null)

import createRoot from 'react-dom/client'; import App from './App'; const root = createRoot(document.getElementById('root')); root.render(<App />); function handleClick() setCount(c => c + 1); setFlag(f => !f); // React 18: renders once import App from './App'

✅ React 18 automatically batches multiple setLikes calls. function MovieList() const movies = [ id: 1, title: 'The Matrix' , id: 2, title: 'Gladiator' ]; return ( <ul> movies.map(movie => ( <li key=movie.id>movie.title</li> )) </ul> );