Function.prototype.bench = function(update){
	update = update || alert;
	var self = this;
	var start, end;
	return this.
		addBefore(function(){start = new Date}).
		addAfter (function(){end   = new Date;update(end - start)})
}

function Profiler(){
	this.keys = [];
	this.records = {};
}
Profiler.prototype = {
	observe : function(object,name){
		var prof = this;
		object.each(function(f,method){
			if(typeof f != "function") return;
			var key = name +"::"+ method;
			prof.keys.push(key);
			prof.records[key] = [];
			object[method] = f.bench(function(time){prof.records[key].push(time)})
		})
	},
	result : function(){
		var prof = this;
		var out = [];
		prof.keys.forEach(function(key){
			var rs = prof.records[key];
			if(!rs.length){return}
			out.push([key
				," count:" , rs.length
				," total:" , rs.sum()
				," mean:"  , Math.floor(rs.mean() * 10) / 10
				," max:"   , Math.floor(rs.max() * 10)  / 10
				," min:"   , Math.floor(rs.min() * 10)  / 10
			].join(""))
		});
		return out;
	},
	alert: function(){
		alert(this.result().join("\n"));
	}
};
Array.prototype.extend({
	sum: function(){
		for(var i = 0, sum = 0; i < this.length; i++) sum += this[i];
		return sum;
	},
	mean: function(){
		return (this.length > 0) ? (this.sum() / this.length) : 0;
	},
	max: function(){
		return (this.length) ? Math.max.apply(null,this) : 0
	},
	min: function(){
		return (this.length) ? Math.min.apply(null,this) : 0
	}
})