Subclassing Functions in Javascript

function SubclassFunction() {
  Function.apply(this, arguments);
  debug("In constructor: " + this);
}
SubclassFunction.prototype = new Function();
SubclassFunction.prototype.toString = function() { return typeof(this.prototype) };

debug("For Function()");
var func = new Function("test", "debug('Function Variable Called')");
var subfunc = new SubclassFunction("test", "debug('Subclass Function Variable Called')");
debug("Types: Sub.proto=" + typeof(SubclassFunction.prototype) +
      " : Func=" + typeof(new Function()) +
      " : func=" + typeof(func) +
      " : subfunc=" + typeof(subfunc));
try {
  func();
  subfunc();
} catch(e) {
  debug(e);
}

debugBreak();

function SubclassString() {
  String(this, arguments);
}
SubclassString.prototype = new String();
SubclassString.prototype.toString = function() { return typeof(this.prototype) + " \"" + String.toString() + "\"" };

debug("For String()");
var string = new String("Test String");
var substring = new SubclassString("Test Subclass String");
debug("Types: Sub.proto=" + typeof(SubclassString.prototype) +
      " : Str=" + typeof(new String()) +
      " : string=" + typeof(string) +
      " : substring=" + typeof(substring));

try {
  debug("String: \"" + string + "\"");
  debug("Subclass String: \"" + substring + "\"");
} catch(e) {
  debug(e);
}

debugBreak();

function SuperclassObject(value) {
  this.value = value;
}
SuperclassObject.prototype = new Object;
SuperclassObject.prototype.toString = function() { return typeof(this.prototype) + " \"" + this.value + "\"" };

function SubclassObject(value) {
  SuperclassObject.apply(this, arguments);
}
SubclassObject.prototype = new SuperclassObject;

debug("For Object()");
var objectone = new SubclassObject("user object one");
var objecttwo = new SubclassObject("user object two");
debug("Types: Sub.proto=" + typeof(SubclassObject.prototype) +
      " : Sup=" + typeof(new SubclassObject()) +
      " : one=" + typeof(objectone) +
      " : two=" + typeof(objecttwo));

debug("Object One: " + objectone);
debug("Object Two: " + objecttwo);