Debouncing scroll events

gistfile1.js

// Sample code from Paul Lewis
// Source: http://www.html5rocks.com/en/tutorials/speed/animations/

var latestKnownScrollY = 0,
	ticking = false;

function onScroll() {
	latestKnownScrollY = window.scrollY;
	requestTick();
}

function requestTick() {
	if(!ticking) {
		requestAnimationFrame(update);
	}
	ticking = true;
}

function update() {
  ticking = false;
	var currentScrollY = latestKnownScrollY;
  console.log("Update!");
}

window.addEventListener('scroll', onScroll, false);