grouped by dates

grouped by dates

groupedDates(dates) {
    let groupedDates = dates.reduce((l, r) => {
      let date = r.OppEvents.DueDate;
      let parseDate = new Date(Date.parse(date));
      let d = parseDate;
      let dd = d.getDate();
      let mm = d.getMonth() + 1; //January is 0!
      let yyyy = d.getFullYear();
      var key = yyyy + dd + mm;
      if (typeof l[key] === "undefined") {
        l[key] = [];
      }
      l[key].push(r);
      return l;
    }, {});


    let result = Object.keys(groupedDates).map((key) => {
      return groupedDates[key];
    });

    return result;
  }