A user-defined Object2 object adding the support of multiple prototypal inheritance.

Object2.js

function Object2() {
  this.prototypes = arguments;
  this.attributes = {};
}; Object2.prototype.get = function(key) {
  return this.attributes[key] || (function(array) {
    for(var i = 0, l = array.length, result; !result && i < l; i++)
    result = array[i].get(key); return result;
  })(this.prototypes);
}; Object2.prototype.set = function(key, value) {
  this.attributes[key] = value;
  return this;
};

/*

 var a = new Object2().set("a", 1).set("b", 2);
 var b = new Object2().set("c", 3).set("d", 4);
 var c = new Object2(a, b).set("e", 5);

 c.get("a") + c.get("b") + c.get("c") + c.get("d") + c.get("e") === 15

*/