Code Mosh React 18 Beginners Fco (2025)
return ( <button onClick=() => setLikes(likes + 1)> 👍 likes </button> );
<MovieIdea title="Interstellar" description="Love across time and space" /> import useState from 'react'; function LikeButton() const [likes, setLikes] = useState(0);
Here’s a structured inspired by the teaching style of Code with Mosh (clear, practical, project-based).
✅ 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> ); code mosh react 18 beginners fco
function MovieIdea( title, description ) return ( <div> <h3>title</h3> <p>description</p> </div> );
import MovieIdea from './MovieIdea'; function App() return ( <div> <h1>My Movie Ideas</h1> <MovieIdea /> </div> );
const [selectedMovie, setSelectedMovie] = useState(null); Pass setSelectedMovie as prop to child. Movie Ideas Tracker return ( <button onClick=() => setLikes(likes + 1)>
React 18’s strict mode mounts/unmounts/mounts in dev – be aware. createRoot (instead of ReactDOM.render) index.js
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(''); function MovieIdea() return ( <
If two components need same data → move state to closest common parent.
function MovieIdea() return ( <div> <h2>Inception</h2> <p>A dream within a dream</p> </div> );
⚠️ Always use a unique key . function DeleteButton( onDelete ) return <button onClick=onDelete>Delete</button>;
