componentDidUpdate
componentDidUpdate is a lifecycle method in React class components that is invoked immediately after a component's updates are flushed to the DOM. It is used to perform side effects, such as network requests or DOM manipulations, based on changes in props or state. This method receives previous props and previous state as arguments, allowing developers to compare them with the current values.
Developers should learn componentDidUpdate when working with React class components to handle side effects that depend on prop or state changes, such as updating a chart when data changes or fetching new data when a prop updates. It is essential for scenarios where you need to respond to component re-renders, but it has been largely replaced by the useEffect hook in functional components for modern React development.