kaleb/jsbin.puqalu.html

## jsbin.puqalu.html
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>

</body>
</html>

## jsbin.puqalu.js
/**
 * Wrap JavaScript properties with before and after methods
 */
function wrapPropertySetter(before, after, obj, propName) {
  var propDescr = Object.getOwnPropertyDescriptor(obj, propName);
  var set = propDescr.set;
  var value = propDescr.value;

  if('value' in propDescr || 'writable' in propDescr) {
    delete propDescr.value;
    delete propDescr.writable;
    propDescr.get = function() {
      return value;
    };
    set = function(val) {
      value = val;
    };
  }
  propDescr.set = function(val) {
    before(val);
    set(val);
    after(val);
  };
  Object.defineProperty(obj, propName, propDescr);
}

function wrapPropertySetters(obj, props) {
  for(var name in props) {
    var prop = props[name];
    wrapPropertySetter(prop.before, prop.after, obj, name);
  }
}
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>JS Bin</title>
	</head>
	<body>

	</body>
	</html>
	/**
	* Wrap JavaScript properties with before and after methods
	*/
	function wrapPropertySetter(before, after, obj, propName) {
	var propDescr = Object.getOwnPropertyDescriptor(obj, propName);
	var set = propDescr.set;
	var value = propDescr.value;

	if('value' in propDescr \|\| 'writable' in propDescr) {
	delete propDescr.value;
	delete propDescr.writable;
	propDescr.get = function() {
	return value;
	};
	set = function(val) {
	value = val;
	};
	}
	propDescr.set = function(val) {
	before(val);
	set(val);
	after(val);
	};
	Object.defineProperty(obj, propName, propDescr);
	}

	function wrapPropertySetters(obj, props) {
	for(var name in props) {
	var prop = props[name];
	wrapPropertySetter(prop.before, prop.after, obj, name);
	}
	}