Lending Management Process, Random Responder Selection

main();

function main(){

const staffList = engine.findDataByVarName("q_management_staff");
const arrStaffs = staffList.split('\n');
let arrValidStaffs = [];
if( arrStaffs.length === 0 ){
  throw new Error( "\n AutomatedTask UnexpectedStaffListError:" +
                   " Population is Zero \n" );
}
for (var i=1; i < arrStaffs.length; i++){
    let staffAttributes = arrStaffs[i].split("\t");
    if (staffAttributes[1] === 0){
        arrValidStaffs.push(staffAttributes[0]);
    }
}
if( arrValidStaffs.length === 0 ){
  throw new Error( "\n AutomatedTask UnexpectedValidStaffListError:" +
                   " Population is Zero \n" );
}

let numRand = Math.floor(Math.random() * arrValidStaffs.length );
engine.log(" numRand: " + numRand + "\n arrValidStaffs.length: " + arrValidStaffs.length);
let quserSelected = quserDao.findByEmail(arrValidStaffs[ numRand ]);
//// == Data Updating / ワークフローデータへの代入 ==
engine.setDataByVarName("q_Manager",quserSelected);
}