Simple JavaScript subclassing

inheritance.js

/*
 * Simple JS subclassing, shamelessly stolen from 
 * http://kevinoncode.blogspot.com/2011/04/understanding-javascript-inheritance.html
 */

function Super() {
  this.value = 42; 
}

function Sub(parent) {
  function SubClass() {}; 
  SubClass.prototype = parent;
  var child = new SubClass();
  // whatever subclass-specific behavior...
  return child;
}

s1 = new Super();
s2 = new Sub(s1);
s2.value; // returns 42