#React

What strategies would you employ to optimize a React application? Mention techniques such as avoiding unnecessary renders, code splitting, and leveraging memoization.

List all the hooks you are aware of in React and explain the difference between 'useRef' and 'useState'.

Implement a timer application. Explain the use of 'useState(prevTime => prevTime + 1)' while coding a timer. Additionally, convert the timer functionality into a custom hook.

Apart from component unmounting, when else does the return function inside useEffect get invoked in React? Discuss scenarios.

What is React.memo? How does its second parameter work, and how can it prevent unnecessary re-renders when prop values change?