gistfile1.txt

/**                                                                                                                                                  
 * @param {Function} func .                                                                                                                          
 * @param {Function} .                                                                                                                               
 */
function decorator(func, begin, end) {
  return function() {
    var time = begin(arguments);
    var result = func.apply(this, arguments);
    setTimeout(function(){
      end(arguments, time);
    }, 0);
    return result;
  };
}


/**                                                                                                                                                  
 * @param {object} ctor Constructor object.                                                                                                          
 */
function addSingleton(ctor) {
  ctor.getInstance = function() {
    if (ctor.__instance__) {
      return ctor.__instance__;
    }
    return ctor.__instance__ = new ctor();
  };
};


**                                                                                                                                                  
 * @constructor                                                                                                                                      
 */
var Profiler = function() {
  this.logs = [];
};
addSingleton(Profiler);


Profiler.prototype.decorator = function(func, message) {
  var self = this;
  var f = decorator(func, function begin() {
      return Date.now();
  }, function end (args, old) {
      self.logs.push(message);
      self.logs.push(old);
      self.logs.push(Date.now());
  });
  return f;
};


Profiler.prototype.report = function() {
  var buf = [];

  var items = this.logs;

  var i = 0;
  var len = items.length;
  var j = len / 3;
  for (; i < j; ++i) {
    console.log(items[(i * 3)] + " : " +  (items[(i * 3) + 2] - items[(i*3) + 1]));
  }
};

exports.Profiler = Profiler;

//usage                                                                                                                                              
//var f = function() {};                                                                                                                              
//f = Profiler.getInstance().decorator(f, "function f()");                                                                                           
//f();
//Profiler.getInstance().report();