f = function(s){
	//reference to the executing function object
	var self = arguments.callee	
	
	//if the array does not exist create it
	if(self.a ==undefined) self.a = []
			
	//getter
	if(arguments.length <1){
		//pop and item off the array
		var r = self.a.pop()
		trace("Undo : " + r)
		//return the value
		return r
			
	//setter
	}else{
		trace("Do : " + s)
		//push an item onto the array
		self.a.push(s)
	}
}
addProperty('history',f,f)
delete f


history = "Wake Up"
history = "Shower"
history = "Brush Teeth"
history = "Make Bed"
history = "Make Coffee"
history = "Cook Bacon"

// Forgot to get dressed undo 3 steps
history
history
history

history = "Get Dressed"
history = "Make Bed"
history = "Make Coffee"
history = "Cook Bacon"

// I shouldn't have gotten up today
history
history
history
history
history
history
history

/* trace
Do : Wake Up
Do : Shower
Do : Brush Teeth
Do : Make Bed
Do : Make Coffee
Do : Cook Bacon
Undo : Cook Bacon
Undo : Make Coffee
Undo : Make Bed
Do : Get Dressed
Do : Make Bed
Do : Make Coffee
Do : Cook Bacon
Undo : Cook Bacon
Undo : Make Coffee
Undo : Make Bed
Undo : Get Dressed
Undo : Brush Teeth
Undo : Shower
Undo : Wake Up
*/