ReactJSInterviewQ.md

1. React Virtual DOM
2. React Profiler
3. Error boundery
   • static getDerivedStateFromError - update the state with error, so that component will render fallback component.
   • componentDidCatch - can log error message.
4. React Lifecycle
5. React Context --> Communication channel, doesn't bother about data organization.
6. controlled (component is controlled by parent component props) vs uncontrolled Component
7. lazy loading --> React.lazy() and React.Suspense fallback={
   Loading...
   }
8. Performance Optimization
   • use shouldComponentUpdate.
   • Not mutate state or props, use spread operator and provide new object everytime.
   • avoid accesing dom directly.