Efficient callback management for window.onresize

watchResize.js

(function(window){
	window.watchResize = function(callback)
	{
		var resizing;
		callback.size = 0;
		function done()
		{
			var curr_size = window.innerWidth;
			clearTimeout( resizing );
			resizing = null;
			// only run on a true resize
			if ( callback.size != curr_size )
			{
				callback();
				callback.size = curr_size;
			}
		}
		window.addEventListener('resize', function(){
			if ( resizing )
			{
				clearTimeout( resizing );
				resizing = null;
			}
			resizing = setTimeout( done, 50 );
		});
		// init
		callback();
	};
}(window));

watchResize.min.js

(function(a){a.watchResize=function(d){var c;d.size=0;function b(){var e=a.innerWidth;clearTimeout(c);c=null;if(d.size!=e){d();d.size=e}}a.addEventListener("resize",function(){if(c){clearTimeout(c);c=null}c=setTimeout(b,50)});d()}}(window));