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My-Portfolio / frontend / src / constants / useIsMobile.js
import { useState, useEffect } from "react";

const useIsMobile = (breakpoint = 768) => {
  const [isMobile, setIsMobile] = useState(window.innerWidth < breakpoint);

  useEffect(() => {
    const handleResize = () => {
      setIsMobile(window.innerWidth < breakpoint);
    };

    window.addEventListener("resize", handleResize);
    return () => window.removeEventListener("resize", handleResize);
  }, [breakpoint]);

  return isMobile;
};

export default useIsMobile;