object.watch polyfill

object-watch.js

/*
 * object.watch polyfill
 *
 * 2012-04-03
 *
 * By Eli Grey, http://eligrey.com
 * Public Domain.
 * NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
 */

// object.watch
if (!Object.prototype.watch) {
	Object.defineProperty(Object.prototype, "watch", {
		  enumerable: false
		, configurable: true
		, writable: false
		, value: function (prop, handler) {
			var oldval = this[prop], newval = oldval,
			getter = function () {
				return newval;
			},
			setter = function (val) {
				oldval = newval;
				return newval = handler.call(this, prop, oldval, val);
			};
			if (delete this[prop]) { // can't watch constants
				Object.defineProperty(this, prop, {
					get: getter,
					set: setter,
					enumerable: true,
					configurable: true
				});
			}
		}
	});
}

// object.unwatch
if (!Object.prototype.unwatch) {
	Object.defineProperty(Object.prototype, "unwatch", {
		  enumerable: false
		, configurable: true
		, writable: false
		, value: function (prop) {
			var val = this[prop];
			delete this[prop]; // remove accessors
			this[prop] = val;
		}
	});
}