Refactor the component that renders a random number (from Promise) and the scroll position. Find the issues and fix them.

The main issues with a component that renders a random number from a Promise and manages scroll position are usually related to:

• Running asynchronous operations directly in the component body, leading to infinite re-renders.
• Not cleaning up event listeners (e.g., for scroll), causing memory leaks.
• Incorrect state management.

An example of a corrected React component with hooks:

import React, { useState, useEffect } from 'react';

function RandomNumberAndScroll() {
  const [randomNumber, setRandomNumber] = useState(null);
  const [scrollPosition, setScrollPosition] = useState(window.scrollY);

  useEffect(() => {
    // Get a random number from Promise once on mount
    const fetchRandomNumber = async () => {
      const number = await new Promise(resolve => {
        setTimeout(() => resolve(Math.floor(Math.random() * 100)), 500);
      });
      setRandomNumber(number);
    };
    fetchRandomNumber();
  }, []); // empty dependency array — called once

  useEffect(() => {
    const handleScroll = () => {
      setScrollPosition(window.scrollY);
    };
    window.addEventListener('scroll', handleScroll);

    return () => {
      window.removeEventListener('scroll', handleScroll);
    };
  }, []);

  return (
    <div>
      <p>Random number: {randomNumber !== null ? randomNumber : 'Loading...'}</p>
      <p>Scroll position: {scrollPosition}px</p>
    </div>
  );
}

export default RandomNumberAndScroll;

Key points:

• The asynchronous call is wrapped in useEffect with an empty dependency array to prevent it from running on every render.
• The scroll event handler is added and removed correctly to avoid leaks.
• States are updated via useState.

This ensures stable and efficient component operation.