Function _addRule

codebase/sources/dhtmlxscheduler.es.js:18216–18223

(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");