21. Isolate the Problem

Debugging is still one of the most important developer skills—especially now that AI often generates code but rarely debugs it well. The secret: isolate the problem.

Too often I see this:

Start the app → 2) click through menus → 3) fill a form → 4) upload a file → 5) submit → 6) error… Then "tweak something," rebuild, and repeat all steps. ⏱️ Time evaporates—while production is on fire.

My framework: RISE 🔍

• Reproduce — Make the bug reproducible in one click.
• Isolate — Cut everything that isn't needed (steps, data, dependencies).
• Simplify — Reduce to the smallest example that still breaks.
• Explain — Understand why it broke before fixing (and document it in a test).

Practical ways to speed up debugging

• Make it fast to repeat: persist state/URL/fixtures so you land right before the failure.
• Binary-search the stack: split the path (API → service → component) until the faulty layer is obvious.
• Turn off dependencies: use mocks/stubs for network, time, randomness, feature flags.
• Unit tests to run tiny pieces in isolation.
• Breakpoints / step-through to inspect values and control flow.
• Storybook to test components without app noise.
• Playwright to capture the path and reproduce faster.
• Targeted logging/trace: meaningful logs with IDs—not blanket console.log.
• Minimal Repro Project: extract the suspect code into a fresh repo or online sandbox; shareable with the team.

Anti-patterns 🛑

• "Let's try one more build."
• Randomly toggling features.
• Big refactors in the middle of an incident.
• Shipping a fix without understanding → bug returns.

Mini-checklist ✅

• ✅ Can I reproduce in <5 seconds?
• ✅ Have I removed irrelevant steps/dependencies?
• ✅ Do I have a minimal repro (test, Storybook story, sandbox)?
• ✅ Do I understand why it happens?
• ✅ Did I add a test to prevent regressions?

After the fix: add a test. Nothing is more annoying than recurring bugs.

👉 What was your toughest bug—and how did you isolate it? Drop it below. Got a production issue that won't budge? DM me—happy to jump in. 🐛