Day 2: Mimicking Component Lifecycle Methods with useEffect

Exersice 1: Simulate componentDidMount and componentWillUnmount
- In App.jsx, use useEffect with an empty dependency array to simulate componentDidMount.
- Inside this useEffect, log a message that says "Dashboard mounted".
- Add another useEffect to simulate componentWillUnmount by returning a cleanup function that logs "Dashboard unmounted".
- Show Solution
Exersice 2: Test Lifecycle Simulation
- Toggle the UserInfo component on and off and observe the console for mount and unmount messages.
- Note how the cleanup function from useEffect behaves like componentWillUnmount.
Exersice 3: Simulate componentDidUpdate
- Use useEffect with specific dependencies (like count or age) to simulate componentDidUpdate.
- Log a message each time the count or age updates.
```
useEffect(() => {
  console.log(`Count updated to: ${count}`);
}, [count]);

useEffect(() => {
  console.log(`Age updated to: ${user.age}`);
}, [user.age]);
```