Local CSV validation workbench
Preview, then export. Everything runs in your browser and original files are not modified.
Check three boundaries
- Change c to a and check duplicate rejection.
- Change 6 to oops and check invalid-number rejection.
- Restore the input: count 3, mean 4. Any edit requires a fresh preview before export.
Reload clears this temporary workbench input; save data and observations in your lesson artifact. Browsers may rename downloads; exports never append to originals.
Return to the task and save test evidenceHow do I retain independent judgment when using AI here?
Keep your own answer before consulting an AI candidate. Check sources, calculations, inference and conditions; explain adoption or rejection. Then solve a new-context task independently and apply the checks to this lesson.
Practice the verification workflow and keep a recordMy learning status
Mark statuses manually; visits do not establish mastery. Languages share statuses while lessons keep their own answers. This backup contains statuses only, not answers or notes.