How to Fix undefined When Displaying Grades from a Student Object in JavaScript

Discover how to resolve the issue of `undefined` appearing in your JavaScript functions when looping through an object's array elements to fetch student grades.
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Understanding the Problem: Why Does undefined Appear?

When working with JavaScript and particularly when looping through arrays within objects, you may encounter unexpected behaviors such as displaying undefined. In this guide, we will explore a practical scenario where a student’s grades are being displayed from an object, and we will address why the output includes undefined and how to fix it.

The problem arises with the following code:

[[See Video to Reveal this Text or Code Snippet]]

This code is set up to loop through the grades array of a student object and log each grade. However, the inclusion of an additional line to log the result of the showContent function causes undefined to be printed in the console.

The Solution: Fixing the Code

Step 1: Understanding the Issue

The problem arises from the following line:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Correcting the Code

To resolve this, you can simply remove the last line:

Updated Code

[[See Video to Reveal this Text or Code Snippet]]

Why This Works

Conclusion

In this case, simply executing the function without attempting to log its return value resolved the issue entirely. Happy coding!