findAllSubs = function(base) {
  var baseProto = base.prototype,
      ans = []
  for (f in window) {
if (f==String) alert("String!")
    var proto = f.prototype
    if (!baseProto.isPrototypeOf(proto))
      continue
    ans.push(proto)
  }
  return ans
}

xs = []
for (f in window) xs.add(f)
xs

findAllSubs(Object)
Object.prototype.isPrototypeOf(String.prototype) true


Object.prototype.__defineGetter__
Object.prototype.__lookupGetter__

Object.prototype.__defineSetter__
Object.prototype.__lookupSetter__

// not supported in Safari
Object.prototype.watch

obj = {}
obj.__defineGetter__("p", function() { return 5 })
obj.__defineSetter__("p", function(v) { alert("cannot assign into p!") })

obj.__lookupGetter__("p")
obj.__lookupSetter__("p")

// only works in Firefox
obj.__noSuchMethod__ = function(sel, args) {
  alert("dnu: " + sel + " " + args)
  return 1234
}

obj.foo(1, 2, 3)

// not supported in Safari
obj.watch("q", function() { return 1234 })