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React / Beginner

Keep state close to the interaction

Local state avoids unnecessary parent renders and keeps component intent obvious.

Why this matters

The production reason.

State that lives too high in the tree forces unrelated UI to rerender and makes components harder to reason about.

Place state beside the button, input, modal, or tab that actually changes it. Lift it only when another component truly needs the value.

This makes refactors easier because the behavior travels with the component.

Copy-ready example
function FilterPanel() {
  const [open, setOpen] = useState(false);

  return (
    <section>
      <button type="button" onClick={() => setOpen((value) => !value)}>
        Filters
      </button>
      {open ? <FilterOptions /> : null}
    </section>
  );
}

Platform notes.

How this applies outside a perfect demo, including frameworks, CMS platforms, stores, and builder workflows.

React: Start local, then lift state when a sibling needs it.

Next.js: Keep this inside small client components instead of making the whole page client-side.

Forms: Use native form state or server actions when the state is only needed on submit.

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