fargo
1a822493ba
963 markdown files reformatted with the repository's pinned prettier so pnpm format:check covers the folded tree like every other repo file. The formatter's embedded-language pass also normalized code fences (TS semicolons, closed HTML tags in examples, lowercased CSS hex colors, one renumbered list that skipped an index). Alphanumeric token deltas vs the fold commit were audited file-by-file; all are formatter-equivalent markup normalizations plus the four sanitized skills.
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.