code: function(year, month, day) {
      var dayOfWeek = this.createDate(year, month, day).getDay();
      return dayOfWeek === this.SATURDAY || dayOfWeek === this.SUNDAY;
    }
docs: Checks if a date falls on a weekend.
  @param {number} year
  @param {number} month
  @param {number} day
  @return {boolean}