150 XP
CODEX · PUT IT TO WORK Plus lesson 15 min

Find the cause before you fix a bug

Trace the missing penny, decide who pays it and check the fix with new amounts.

New to Codex? Start with the first lesson in this guide.

What this lesson covers

  1. Describe the symptom, not a fix
  2. Ask for the cause first
  3. Decide who pays the extra penny
  4. Fix it and test with new amounts
  5. Commit with a clear message

You’ll come away with: Describe the symptom, get the cause explained before any edit, make the human decision yourself, and test the fix with new amounts.