Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript JavaScript Loops, Arrays and Objects Tracking Data Using Objects The Build an Object Challenge, Part 2 Solution

Josie Nagy
Josie Nagy
14,992 Points
Posted by Josie Nagy
Josie Nagy
14,992 Points

Undefined issue

Hi everyone! I'm stuck trying to understand what's going on here.

My issue: instead of displaying the name, as it should, it just shows me this in the browser:

Student: undefined

Here is my solution so far:

var message = "";
var student;

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

for (var i = 0; i < students.length; i += 1) {
  var student = students[i]; 
  message += '<h2>Student: ' + students.name + '</h2>';
}

print(message);

My JSON file:

var students = [
  {
    name : "Josie",
    track : "Python Development",
    achievements : 108,
    points : 11500
  },
  {
    name : "Caleb",
    track : "iOS Development with Swift",
    achievements : 68,
    points : 18099
  },
  {
    name : "Andal",
    track : "Design Thinking",
    achievements : 73,
    points : 9960
  },
  {
    name : "Tara",
    track : "Front End Development",
    achievements : 530,
    points : 40021
  },
  {
    name : "Jonathan",
    track : "JavaScript Basics",
    achievements : 44,
    points : 2504
  }
];

My index.html file:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Students</title>
    <link rel="stylesheet" href="css/styles.css">
  </head>
  <body>
    <h1>Students</h1>
    <div id="output">

    </div>
    <script src="./js/student-records.js"></script>
    <script src="./js/students.js"></script>
  </body>
</html>

1 Answer

anthony amaro
anthony amaro
8,686 Points

one issue is that you are trying to get the name from the array not the object

var student = students[i]; 
 message += '<h2>Student: ' + students.name + '</h2>';
// it should be student.name

you are storing the objects in student variable. students is the array. hope this helps

Josie Nagy
Josie Nagy
14,992 Points
Josie Nagy
Josie Nagy
14,992 Points

Thanks a lot Anthony, yes that was the issue. I understand the difference now.