Intersection Observer & Efficient Scroll Handling

How should you implement efficient scroll-based parallax effects?

const parallaxObserver = new IntersectionObserver((entries) => {
  entries.forEach(entry => {
    if (entry.isIntersecting) {
      const ratio = Math.min(Math.max(entry.intersectionRatio, 0), 1);
      const yOffset = (1 - ratio) * 100;
      entry.target.style.transform = `translateY(${yOffset}px)`;
    }
  });
}, {
  threshold: Array.from({ length: 50 }, (_, i) => i / 49)
});

Use scroll event with requestAnimationFrame
Calculate positions on interval
Use Intersection Observer with multiple thresholds
Implementing parallax effects with Intersection Observer provides several advantages: 1) It's more performant than scroll event listeners as it's optimized by the browser, 2) Multiple thresholds allow smooth transitions without constant calculations, 3) The intersectionRatio provides a natural progress value for animations, 4) It automatically handles different scroll speeds and devices. The code demonstrates creating smooth parallax movement based on intersection ratio, with 50 threshold points for fluid animation.
Update all elements continuously

Next Question (17/20)