var newStafflist = []; for (var i = 0; i < staffdata.length; i++) { var department = staffdata[i][4]; if (depData.flat().includes(department) && department !== "") { newStafflist.push([staffdata[i][2], staffdata[i][3], staffdata[i][4], staffdata[i][5], staffdata[i][8], staffdata[i][9], staffdata[i][10], staffdata[i][7]]); } }