wrapping natives.js

(function($G)
{
  var _extend = 
    Object.getOwnPropertyNames && function(from, to)
    {
      var keys = Object.getOwnPropertyNames(from);
      
      var i = keys.length; while(i--)
      {  
        var key = keys[i];
        
        to[key] = from[key];
      }
    } ||
    function(from, to)
    {
      for(var i in from)
      {
        if(from.hasOwnProperty(i))
          to[i] = from[i];
      }
    }
  ;
  
  var defaultThis = (function(){ return this; })();
  
  var _wrap = function(name, _wrap)
  {
    var Old = $G[name];
    var toString = String(Old);
    var Wrapper = _wrap(name);
    
    _extend(Old, Wrapper);
    Wrapper.toString = function(){ return toString };
    Wrapper.prototype = Old.prototype;
    Old.prototype.constructor = Wrapper;
    $G[name] = Wrapper;
  };
  
  var _newAndCast = function(name)
  {
    var Old = $G[name];
    
    return function()
    {
      console.log(name);
      
      if(this === defaultThis) // cast
        return Old.apply(null, arguments);
      else // new
        Old.apply(this, arguments);
    }
  };

  var _new = function(name)
  {
    var Old = $G[name];
    
    return function()
    {
      console.log(name);
      
      return Old.apply(null, arguments);
    }
  };

  
  _wrap('Object', _newAndCast);
  _wrap('Function', _new);
  _wrap('Boolean', _newAndCast);
  _wrap('Number', _newAndCast);
  _wrap('String', _newAndCast);
  _wrap('RegExp', _new);
  _wrap('Date', _new);
})(this);