niw - A way to create new object from a constructor without the 'new' operator, just for fun and to emulate how the new operator works on pure javascript. WARNING - DO NOT USE IT ON YOUR PROJECTS

niw.js

/*
  code snippet by Fabio Miranda Costa
  Its just for the purpose of understanding how the 'new' operator works.
  Should work on gecko and webkit.
  WARNING - DO NOT USE IT ON YOUR PROJECTS
*/

var niw = function(_constructor, args){
  var newObj = {'__proto__': _constructor.prototype};
  var ret = _constructor.apply(newObj, args);
  return (typeof ret == 'object') ? ret : newObj;
};

var Foo = function(){};

Foo.prototype.foo = function(msg){
  console.log('foo', msg);
};

var foo = niw(Foo);

foo.foo('foo');

var Bar = function(){};

Bar.prototype = niw(Foo);
Bar.prototype.constructor = Bar;

Bar.prototype.bar = function(msg){
  console.log('bar', msg);
};

var bar = niw(Bar);

bar.bar('bar');
bar.foo('bar');

a jsbin to change it or see it working http://jsbin.com/apule5/edit