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UserCard.jsxbefore
// Unoptimized component
function UserCard({ userId }) {
const [user, setUser] = useState(null);
const [posts, setPosts] = useState([]);
useEffect(() => {
fetch(`/api/users/${userId}`)
.then(res => res.json())
.then(setUser);
fetch(`/api/users/${userId}/posts`)
.then(res => res.json())
.then(setPosts);
}, [userId]);
const formatName = (user) => {
return user?.firstName + ' ' + user?.lastName; // [!code highlight]
};
return (
<div>
<h2>{formatName(user)}</h2> // [!code highlight]
<p>Posts: {posts.length}</p> // [!code highlight]
</div>
);
}UserCard.jsxafter
// Optimized component
function UserCard({ userId }) {
const [user, setUser] = useState(null);
const [posts, setPosts] = useState([]);
useEffect(() => {
const controller = new AbortController(); // [!code ++]
Promise.all([ // [!code ++]
fetch(`/api/users/${userId}`, { signal: controller.signal }), // [!code ++]
fetch(`/api/users/${userId}/posts`, { signal: controller.signal }) // [!code ++]
]).then(async ([userRes, postsRes]) => { // [!code ++]
setUser(await userRes.json()); // [!code ++]
setPosts(await postsRes.json()); // [!code ++]
}); // [!code ++]
return () => controller.abort(); // [!code ++]
}, [userId]);
const fullName = useMemo(() => { // [!code ++]
return user?.firstName + ' ' + user?.lastName; // [!code ++]
}, [user]); // [!code ++]
return (
<div>
<h2>{fullName}</h2> // [!code focus]
<p>Posts: {posts.length}</p>
</div>
);
}VS
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