Intersection Observer & Efficient Scroll Handling

let observer = new IntersectionObserver(callback);

// Later in the code
function cleanup() {
  observer.disconnect();
  observer = null;
}

To pause observation temporarily
To remove specific targets
To stop all observations and free resources
The disconnect() method is crucial for proper resource management because it: 1) Stops all observations by the observer instance, 2) Frees up memory and system resources, 3) Prevents memory leaks by cleaning up observer references, 4) Is important when removing components or cleaning up single-page applications. This method should be called when the observer is no longer needed, such as when unmounting components or navigating away from pages.
To reset observer options