How to fetch last value in the for loop using javascript?

    var new_data = $.parseJSON(data);
        for (var j = 0; j < new_data.all_soa_details.length; j++) {
          var td7_contact = new_data.all_soa_details[j].bal; //100,200,200,50 . here i need to fecth 50 only
          let td77_contact = Math.abs(td7_contact);
        }

i am getting values 100, 200,40,60, 50.. Here i need to fetch 50 becoz its last valuje in the for loop .How to get this last value?

>Solution :

new_data.all_soa_details[new_data.all_soa_details.length - 1].bal

should give you the expected result