gistfile1.js

var util = require('util');

function Parent(arg) {
  console.log('parent constructor: arg=' + arg);
  
}
Parent.prototype.foo = function() {
  console.log('fooing!');
  return this;
};


function Child(arg) {
  console.log('child constructor: arg=' + arg);
  
  Child.super_.apply(this, arguments);
}
util.inherits(Child, Parent);
Child.prototype.foo = function() {
  Child.super_.prototype.foo.apply(this, arguments);
  console.log('child fooing!');
  return this;
};
Child.prototype.bar = function() {
  console.log('baring!');
  return this;
};



new Child('baz').foo().bar();
// child constructor: arg=baz
// parent constructor: arg=baz
// fooing!
// child fooing!
// baring!