const vs let vs var

 const workshopsList = this.props.store.filteredWorkshops.map( (workshop) => {

            let formattedRangeDate = getFormattedRangeDate(workshop.StartDate, workshop.EndDate, this.rageDateDelimeter);
            let maxSeats = workshop.maximum;
            let availables = workshop.maximum - workshop.BookingCount;
            let monthDate = getMonthDate(workshop.StartDate);
            
            });