What are the new hooks introduced in React 18, and why are they useful?

React 18 introduced new hooks like useId, useTransition, and useDeferredValue to improve unique ID generation, manage UI transitions smoothly, and defer less urgent updates for a better user experience.

These hooks help developers build more accessible and performant apps by handling complex UI states with ease, enabling smoother rendering during concurrent tasks, and avoiding visual glitches. They are especially useful for handling asynchronous data and interactive interfaces in modern React apps.

Code

import { useTransition, useDeferredValue, useId } from 'react';

function App() {
  const [isPending, startTransition] = useTransition();
  const deferredValue = useDeferredValue(someInput);
  const id = useId();

  // Use startTransition to mark non-urgent updates
  // Use deferredValue to delay rendering high-cost updates
  // Use id for stable unique IDs across server/client
}