How do Custom Hooks encapsulate stateful logic and promote code reuse?

import { useState, useEffect } from "react";

// Custom hook to detect window dimensions
export function useWindowDimensions() {
  const [dimensions, setDimensions] = useState({
    width: typeof window !== "undefined" ? window.innerWidth : 0,
    height: typeof window !== "undefined" ? window.innerHeight : 0
  });

  useEffect(() => {
    function handleResize() {
      setDimensions({ width: window.innerWidth, height: window.innerHeight });
    }
    window.addEventListener("resize", handleResize);
    return () => window.removeEventListener("resize", handleResize);
  }, []);

  return dimensions;
}

// In any component:
// const { width } = useWindowDimensions();