function Set(){

  this.values = {};

  this.n = 0;

  this.add.apply(this, arguments);

}

​

Set.prototype = {

  constructor : Set,

  add : function(){

    console.log("add " + arguments);

    for(var i=0; i<arguments.lenght; i++){

      var val = arguments[i];

​

      var str = Set._v2s(val);

      if(!this.values.hasOwnProperty(str)){

        this.values[str] = val;

        this.n++;

      }

    }

  },

  get size(){

    return this.n;

  }

};

​

Set._v2s = function(val){

  switch(val){

    case undefined: return "u";

    case null: return "n";

    case true: return "t";

    case false: return "f";

    default: switch(typeof val){

      case "number": return "#"+val;

      case "string": return '"'+val;

      default: return "@" + ObjectId(val);  

      }

  }

  function objectId(o){

    var prop = "|**objectid**|";

    if(!o.hasOwnProperty(prop)){

      o[prop] = Set._v2s.next++;

    }

    return o[prop];

  }

};

​

Set._v2s.next = 100;

​

​

​

set = new Set(1,"2");

​