how to give top in reactjs in js code example

Example 1: toggle class onscroll hook react

const [scroll, setScroll] = useState(0)

  useEffect(() => {
    document.addEventListener("scroll", () => {
      const scrollCheck = window.scrollY < 100
      if (scrollCheck !== scroll) {
        setScroll(scrollCheck)
      }
    })
  })

Example 2: how to make page scroll to the top jsx

componentDidMount() {
  window.scrollTo(0, 0)
}