gistfile1.js

  // derive from gamecore.Pooled, instead of gamecore.Base
  var Fighter = gamecore.Pooled.extend('Fighter',
  {
      create: function(hp)
      {
           var n = this._super();  // acquire from the pool
           n.hp = hp; // (re)setup the object instance
           return n;
      }
  },
  {
     ...
  });

 var gunship = Fighter.create(100); // use .create not new
 gunship.release();  // hand it back to the pool 

 // get a list of free or used objects (as gamecore.LinkedList's)
 var inUse = Fighter.getPool().usedList;
 var free = Fighter.getPool().freeList;