Flyweight.ts

function Flyweight(make, model, processor) {
  this.make = make;
  this.model = model;
  this.processor = processor;
}

var FlyWeightFactory = (function () {
  var flyweights = {};

  return {
    get: function (make, model, processor) {
      if (!flyweights[make + model]) {
        flyweights[make + model] = new Flyweight(make, model, processor);
      }
      return flyweights[make + model];
    },

    getCount: function () {
      var count = 0;
      for (var f in flyweights) count++;
      return count;
    },
  };
})();

function ComputerCollection() {
  var computers = {};
  var count = 0;

  return {
    add: function (make, model, processor, memory, tag) {
      computers[tag] = new Computer(make, model, processor, memory, tag);
      count++;
    },

    get: function (tag) {
      return computers[tag];
    },

    getCount: function () {
      return count;
    },
  };
}

var Computer = function (make, model, processor, memory, tag) {
  this.flyweight = FlyWeightFactory.get(make, model, processor);
  this.memory = memory;
  this.tag = tag;
  this.getMake = function () {
    return this.flyweight.make;
  };
  // ...
};

var computers = new ComputerCollection();

computers.add('Dell', 'Studio XPS', 'Intel', '5G', 'Y755P');
computers.add('Dell', 'Studio XPS', 'Intel', '6G', 'X997T');
computers.add('Dell', 'Studio XPS', 'Intel', '2G', 'U8U80');
computers.add('Dell', 'Studio XPS', 'Intel', '2G', 'NT777');
computers.add('Dell', 'Studio XPS', 'Intel', '2G', '0J88A');
computers.add('HP', 'Envy', 'Intel', '4G', 'CNU883701');
computers.add('HP', 'Envy', 'Intel', '2G', 'TXU003283');

console.log('Computers: ' + computers.getCount());
console.log('Flyweights: ' + FlyWeightFactory.getCount());