function TDBList(el) {
  console.log('Test TDBList. el = ', el);
}

TDBList.prototype.onAddCondition = function (sender) {
  var nCond = {};
  nCond.container = 'my html code';
  return nCond.container;
};

TDBList.prototype.restoreData = function (param = 0) {
  var form = this.onAddCondition();
  console.log('Test restoreData. form = ', form);
}

var list01 = new TDBList('row-01');
list01.restoreData();

Test TDBList. el = row-01
Test restoreData. form =  my html code