As a student, there are many debugging tools available in your Code Editor.

Use the Docs in the Code Editor to see examples of all of the most important coding concepts that you've learned in the course so far. It's a great place to look for examples and check code syntax!

The History tab can be found under More in the Code Editor. Here you can view every previous version of your program. If a program was working but now isn't, reviewing an earlier version is a great way to spot changes that might have caused an error.

Adjust the Speed Slider to run code more slowly so you can pinpoint where the program gets off-track. You can also use the Next and Last buttons at the top of the Code Editor to run code one line at a time. This allows you to zero in on the exact line of code causing the error.

Comment out different sections of code, then re-run the code. When the code runs, the commented-out portions will be skipped, allowing you to use process of elimination to target the portion of code that is causing an error.

As much as possible, we always try to make error messages as informative as we can. If you're seeing an error message, check if it references a specific function, syntax error, or line of code that can be fixed before re-running the code.

Click here to learn more about the most common error messages you may run into when working on Karel assignments.

As a student, you can also click the red Test Code button to see where your program passes or does not pass the CodeHS Autograder. The progress bar at the top tells you how many tests you have passed.

Don't forget! You can always rewatch the lesson video, and go back over the lesson slides to review all of the example code. This is a great way to refresh your memory if you forget a specific programming concept or proper syntax.

Every CodeHS lesson includes an example, which shows the lesson concept in a live code editor. Review the example code at any time and compare your own work.