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const getId = (link) => link.getAttribute('href').replace('#', '')

const observer = new IntersectionObserver(
   (entries) => {
      entries.forEach((entry) => {
         if (entry.isIntersecting) {
            document.querySelectorAll('.menu__link').forEach((link) => {
               link.classList.toggle('menu__link--active', getId(link) === entry.target.id)
            })
         }
      })
   },
   {
      threshold: 0.4,
   }
)
document.querySelectorAll('.section').forEach((section) => {
   observer.observe(section)
})