debounce.js

// debounce a callback function with delay being the longest acceptable time before seeing an effect
function debounce (fn, delay) {
  var timeout = null;
	return function () {
		if( timeout !== null ){ clearTimeout( timeout ); }
		timeout = setTimeout( fn, delay );
	}
}

// example use:
function callback () { console.log("Called back"); }
window.onresize = debounce( callback, 100 );