Class(A,["acorn count"]); 
function A() 
{ 
  this.konstructor = function(p1){ this.a = p1; } 
  this.sayHi       = function(){ alert("Howdy!"); } 
  this.sayBye      = function(){ alert("Bye!"); } 
  this.dumpvars    = function(){ return " a="+this.a; } 
  this.dump        = function(){ return "["+this.dumpvars()+" ]"; } 
} 

Class(B,["acorn portion","bananas"]).Extends(A); 
function B() 
{ 
  this.konstructor = function(p1,p2){ this.souper(p1); this.b = p2; } 
  this.dumpvars    = function(){ return this.souper()+" b="+this.b; } 
  this.sayBye      = function(){ alert("Aloha!"); } 
} 

Class(C).Extends(B); 
function C() 
{                                       //invoke B constructor directly 
  this.konstructor = function(p1,p2,p3){ this.B(p1,p2); this.c = p3; } 
  this.dumpvars    = function(){ return this.souper()+" c="+this.c; } 
  this.sayHi       = function(){ this.souper(); alert("Y'all"); } 
} 

var gA  = new A(1); 
var gB  = new B(2,3); 
var gC  = new C(4,5,6); 

var gX; 

// test not passing enough constructor arguments (which is not legal) 
try      { gX = new B(2); } 
catch(e) { alert("caught:["+e+"]"); } 

// test passing null to required constructor argument (which is legal) 
try      { gX = new B(2,null); } 
catch(e) { alert("caught:["+e+"]"); } 

// test undefined required constructor argument (which is not legal) 
try      { gX = new B(2,undefined); } 
catch(e) { alert("caught:["+e+"]"); } 

function dumpObjects() 
{ 
  var s = "gA:("+gA.name+")" + gA.dump() + "[br/]" 
        + "gB:("+gB.name+")" + gB.dump() + "[br/]" 
        + "gC:("+gC.name+")" + gC.dump() + "[br/]"; 

  document.getElementById("OutputArea").innerHTML = s; 
}