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Pascual Vila

Pascual Vila

Frontend Instructor // Code Syllabus

Common Pitfalls & Errors

The Error //

Applying an AI-suggested bug fix without verifying it against an actual, reliable reproduction of the bug

// Wrong: applied on faith, never actually re-verified // Correct: verified against the real reproduction case 1. Confirm the bug reproduces with a specific input 2. Apply the suggested fix 3. Re-run the SAME reproduction — does it now actually pass?

The Solution //

An AI's explanation of a bug's root cause is a hypothesis based on pattern-matching the described symptoms, not a guaranteed-correct diagnosis — a plausible-sounding but ultimately incorrect explanation is common enough that the suggested fix needs to be verified by actually re-running the original reproduction case before being trusted and merged.

The Error //

Describing a bug vaguely ("it happens sometimes") instead of providing a specific, reliably reproducible case

// Hard to diagnose or verify a fix for "Orders sometimes fail" // Reproducible — enables actual verification "Reliably fails with: createOrder({ items: [], total: 0 })"

The Solution //

Without a concrete, reproducible case, neither a human nor an AI assistant has a reliable way to confirm a proposed fix actually resolves the issue — diagnosis and verification both depend on being able to consistently trigger the same failure and observe whether it's actually resolved.

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