gistfile1.js

exports.Freelist.prototype.alloc = function(){
  var instance;
  if(this.list.length){
    instance = this.list.shift();
    if(instance.hasOwnProperty("onAlloc")){
      instance.onAlloc.call(instance);
    }
  } else {
    instance = this.constructor.apply(this, arguments);
  }
  return instance;
};