Function _addRule

codebase/sources/dhtmlxscheduler.js:18220–18227

(rrule, collection)

    return RRuleSet2;
  }(RRule);
  function _addRule(rrule, collection) {
    if (!(rrule instanceof RRule)) {
      throw new TypeError(String(rrule) + " is not RRule instance");
    }
    if (!includes(collection.map(String), String(rrule))) {
      collection.push(rrule);
    }
  }
  function _addDate(date, collection) {
    if (!(date instanceof Date)) {
      throw new TypeError(String(date) + " is not Date instance");