Simple Data Warehouse

data_warehouse.js

var Data = function() {
  var warehouse = {};
  var count = 1;
  return {
    reset: function() {
      count = 1;
      warehouse = {};
    },
    set: function (dom, data) {
      if (!dom.__data) {
        dom.__data = "hello" + count++;
      }
      warehouse[dom.__data] = data;
    },
    get: function(dom) {
      return warehouse[dom.__data];
    }
  };
}();

alternative: https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Using_data_attributes