Code Mosh React 18 Beginners Fco Apr 2026

If two components need same data → move state to closest common parent.

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

No () => unless passing arguments. import useState, useEffect from 'react'; function MovieFacts() const [fact, setFact] = useState(''); code mosh react 18 beginners fco

import MovieIdea from './MovieIdea'; function App() return ( <div> <h1>My Movie Ideas</h1> <MovieIdea /> </div> );

function MovieIdea( title, description ) return ( <div> <h3>title</h3> <p>description</p> </div> ); If two components need same data → move

function MovieIdea() return ( <div> <h2>Inception</h2> <p>A dream within a dream</p> </div> );

✅ 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> ); function MovieList() const movies = [ id: 1,

⚠️ Always use a unique key . function DeleteButton( onDelete ) return <button onClick=onDelete>Delete</button>;