drop(info) {
    var that = this;
    var startDate = info.date;
    var frequency = this.skippingNumber;

    for (var i = 0; i <= 3; i++) {
      (function (start) {
        that.calendarEvents = that.calendarEvents.concat({
          title: 'Dropped Event',
          start: start,
          allDay: info.allDay
        });
      })(startDate);
      startDate = this.addDays(startDate, frequency);
    }
  }

addDays(date: Date, days: number): Date {
    var passedDate = date;
    passedDate.setDate(passedDate.getDate() + days);
    return passedDate;
  }