Debug like a pro
Definition and example
Debug like a pro is the focus of this lesson. Reproduce, isolate, fix, then confirm — in that order. The task asks you to apply that idea in a small example: What is the first debugging step. Before you run the code, predict what should happen. Then Inspect the browser output and the value your code produces and compare it with your prediction. If the result differs, change one relevant line and run it again. Testing one change at a time makes the cause of a result easier to understand.
Run your code to see the output and the checks.
Submit your code to see results
Write your code in the middle column and press Run code.
Why this works
Checks on this task:
- The output must include “debug”.
The task and step-by-step instructions are written as comments at the top of the editor. Change one relevant line, run it, and compare the result with these checks.
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Incorrect attempts before answer: 0 / 3
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Worked answer
You have made three incorrect attempts. Review this example, close the window, and continue practising.