What is React re-rendering and how does it work?

What is React re-rendering and how does it work?

React re-rendering is the process where React updates the UI to reflect changes in state or props. When a component's state or props change, React re-renders that component and its children to ensure the UI is in sync with the underlying data.

What triggers a re-render in React?

Re-renders in React can be triggered by changes in state, changes in props, or when a parent component re-renders. Additionally, using hooks like useState or useEffect can also lead to re-renders.

Can I prevent unnecessary re-renders?

Yes, you can prevent unnecessary re-renders by using React.memo for functional components, shouldComponentUpdate for class components, and optimizing state management.

What is the difference between state and props?

State is managed within a component and can change over time, while props are passed from parent to child components and are immutable within the child.