Sample Edit function
Example code for editing record
function accepts parameter of index which we will use as reference to update record in the array
//edit function sets editMode and currentIndex
function editStudent(index){
editMode = true;
currentIndex = index;
let editStudent = students[index];
document.getElementById('student_name').value = editStudent.student_name;
document.getElementById('username').value = editStudent.username;
document.getElementById('password').value = editStudent.password;
}