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https://github.com/kjanat/livedash-node.git
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Kaj Kowalski
cd05fc8648
- Fix syntax errors in skills markdown files (.github/skills, .opencode/skills) - Change typescript to tsx for code blocks with JSX - Replace ellipsis (...) in array examples with valid syntax - Separate CSS from TypeScript into distinct code blocks - Convert JavaScript object examples to valid JSON in docs - Fix enum definitions with proper comma separation
1.1 KiB
1.1 KiB
title, impact, impactDescription, tags
| title | impact | impactDescription | tags |
|---|---|---|---|
| Extract to Memoized Components | MEDIUM | enables early returns | rerender, memo, useMemo, optimization |
Extract to Memoized Components
Extract expensive work into memoized components to enable early returns before computation.
Incorrect (computes avatar even when loading):
function Profile({ user, loading }: Props) {
const avatar = useMemo(() => {
const id = computeAvatarId(user);
return <Avatar id={id} />;
}, [user]);
if (loading) return <Skeleton />;
return <div>{avatar}</div>;
}
Correct (skips computation when loading):
const UserAvatar = memo(function UserAvatar({ user }: { user: User }) {
const id = useMemo(() => computeAvatarId(user), [user]);
return <Avatar id={id} />;
});
function Profile({ user, loading }: Props) {
if (loading) return <Skeleton />;
return (
<div>
<UserAvatar user={user} />
</div>
);
}
Note: If your project has React Compiler enabled, manual memoization with memo() and useMemo() is not necessary. The compiler automatically optimizes re-renders.