Mucking about with javascript objects

objects.js

var a = function(y) {
    var z    = 1; //shared between instances, accessible via prototype method
    var x    = 2; //shared between instances
    var self = this;
    this.y   = null; //not shared

    var impl = function(y) {
    };
    
    var init = function(y) {
        if (y !== undefined) {self.y = y}
        return impl;
    }
    
    impl.gety = function() {
        return self.y;
    };
    
    impl.sety = function(y) {
        self.y = y;
    }
    
    impl.getx = function() {
        return x;
    };
    
    impl.prototype.getz = function() {
        return z;
    };

    
    return init(y);
}

var b = new a(45);
var c = new a();
var d = new a(10);

var p = Object.create(b);
p.foo = 242;

console.log('p x', p.getx())
console.log('p y', p.gety())
console.log('p z', p.prototype.getz())
console.log('==================');

var q = Object.create(p);
console.log('q z', q.prototype.getz())
console.log('q foo', q.foo)
console.log('==================');

console.log('y from b', b.gety());
console.log('y from c', c.gety());
console.log('y from d', d.gety());
console.log('==================');


console.log('x from b', b.getx());
console.log('x from c', c.getx());
console.log('==================');

console.log('z from b', b.prototype.getz());
console.log('==================')

b.sety(100);
console.log('y from b', b.gety());
console.log('y from c', c.gety());
console.log('==================');

/*var Request = function() {
    // Convenience helpers
    this.endpoints = {
       user: 'user',
       login: 'user/login'
    };
 
    this.apiBase = 'http://myserver.com/api/';
 
    this.make = function(options) {
       var url = this.apiBase;
 
      // resolve URL
      if(this.endpoints.hasOwnProperty(options.endpoint)) {
        url += this.endpoint;
      }
 
      // return a new request object
      return new HTTP(url, options);
    }
    
    console.log('this', this);
    return this;
};

var r = new Request();*/