Simple object pool

objectPool.js

if (!window.myObj) {
	myObj = (function(){
		var aPool = [];
		function obj(x,y) {
			var fX,fY
				,oObj = {
					set:set
					,drop:drop
				}
			;
			set(x,y);
			function set(x,y) {
				fX = x===undefined?1:x;
				fY = y===undefined?0:y;
				return oObj;
			}
			function drop() {
				aPool.push(oObj);
			}
			return oObj;
		}
		return function(x,y) {
			return aPool.length?aPool.pop().set(x,y):obj(x,y);
		};
	})();
}