Lifting State Up

Lifting state up is a common pattern in React where state is moved to the closest common ancestor of two or more components that need to share it. Instead of duplicating state logic in multiple child components, you centralize the state in a parent component and pass it down via props. This helps maintain a single source of truth, which makes applications more predictable and easier to manage.

When to Lift State Up

• When multiple components need access to or control over the same piece of state

• When child components must coordinate or share behavior

• To eliminate duplicate or conflicting states

Example:

function Parent() {
  const [value, setValue] = useState('');
  return (
    <>
      <Input value={value} onChange={setValue} />
      <Preview value={value} />
    </>
  );
}
function Input({ value, onChange }) {
  return <input value={value} onChange={(e) => onChange(e.target.value)} />;
}
function Preview({ value }) {
  return <p>{value}</p>;
}

In this example, both Input and Preview components depend on the same state, which lives in the Parent.

Benefits

• Keeps state in sync across components

• Reduces complexity and duplication

• Makes components easier to reason about

• Encourages a clear, top-down data flow

Why It Matters

"Lifting state up" is a core concept in React’s design philosophy of unidirectional data flow. It helps maintain consistent behavior and improves component composability—especially as applications grow in size and complexity.

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