gistfile1.js

var ok1, ok2, ok3, ok4, ok5, ok6; 
 
function A(){ 
  ok1 = (this.constructor!=arguments.callee); 
}; 
function B(){ 
  ok2 = (this.constructor==arguments.callee); 
}; 
 
A(); 
new B(); 
 
function Foo(){ 
  if (this.constructor!=arguments.callee) 
    return new arguments.callee({__is_arguments:arguments}); 
  else if(arguments[0] && arguments[0].__is_arguments) 
    return arguments.callee.apply(this,arguments[0].__is_arguments); 
 
  this.init.apply(this, arguments); 
} 
Foo.prototype = {