Minimal Implementation of Eric Elliot's Stampit

OBJ.js

var OBJ = {
	create:function(obj) {
		return (function() {
			var priv = {};
			var pub = {
				__proto__:obj ? obj.__proto__ : {},
				setPriv:function(name, value) {
					priv[name] = value;
				},
				getPriv:function(name) {
					return priv[name];
				}
			};
			return pub;
		})();
	},
	state:function(obj, name, value) {
		obj[name] = value;
	},
	method:function(obj, name, func) {
		obj.__proto__[name] = func;
	},
	enclose:function(obj, name, value) {
		obj.setPriv(name, value);
	},
	clone:function(obj) {
		return OBJ.props(obj, OBJ.create(obj));;
	},
	compose:function(arr) {
		if (arr.length === 0) return;
		var obj = OBJ.clone(arr[0]);
		for (var i = 1; i < arr.length; i++)
			obj = OBJ.props(arr[i], OBJ.protos(arr[i], obj));
		return obj;
	},
	props:function(obj1, obj2){
		for (var name in obj1)
			if (name !== 'setPriv' && name !== 'getPriv') obj2[name] = obj1[name];
		return obj2;
	},
	protos:function(obj1, obj2) {
		for (var name in obj1.__proto__)
			obj2.__proto__[name] = obj1.__proto__[name];
		return obj2;
	}
};

var a = OBJ.create();
a.name = 'matt';
OBJ.method(a, 'foo', function() {
	console.log(this.name);
});

var b = OBJ.clone(a);
b.age = 32;

var c = OBJ.create();
c.last = 'lock';

var d = OBJ.compose([a, b, c])

console.log(d.name);
console.log(d.last);
console.log(d.age);
d.foo();

Wrote this after watching Eric Elliot's talk from JSConf EU.

Basically, you can
create objects
enclose and use private values through setPriv and getPriv
set methods
set properties
clone
and compose objects from multiple objects