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JavaScript

My solution to the Student Record Search Challenge

Here is my solution. When printing out two or more students, I get a comma between each student record data, can you figure out why?

var message = [];
var student;
var nameSearch;
var studentNames = [];
var nameIndex;

function print(message) {
  var outputDiv = document.getElementById('output');
  outputDiv.innerHTML = message;
}

function getStudentReport(student) {
  report = '<h2>Student: ' + student.name + '</h2>';
  report += '<p>Track: ' + student.track + '</p>';
  report += '<p>Points: ' + student.points + '</p>';
  report += '<p>Achievements: ' + student.achievements + '</p>';
  return report;
}

while(true){
  nameSearch = prompt('Search student records: type a name (or type "quit" to end.');
  if(nameSearch === null || nameSearch.toLowerCase() === 'quit'){
    break;
  }
  for (var i = 0; i < students.length; i += 1){
     student = students[i];
     studentNames[i] = student.name.toLowerCase(); // collecting the names from the objects
    if(nameSearch === studentNames[i]){
      var record = getStudentReport(student);
      message.push(record); //stored the report of existing students in the message array
    } 
  }
  print(message);
  //Use the studentNames array to search for the an index, if not then alert will pop up
  nameIndex =studentNames.indexOf(nameSearch);
  if(nameIndex < 0){
    alert('There is no ' + nameSearch + ' in the student record. Try another name.');
  }
}