Random console.log() debugging is not a strategy. Here's how professionals find bugs.
1. Reproduce
Can you trigger the bug reliably? If yes, you're 50% done. Find the exact steps, inputs, and conditions that cause it.
2. Isolate
Binary search the code. Comment out half. Does the bug still happen? Now you know which half. Repeat until you find the exact line.
3. Understand
Don't just fix the symptom. WHY does this line cause the bug? What assumption was wrong? Is the same wrong assumption elsewhere?
4. Fix and Verify
Fix the root cause, not the symptom. Write a test that fails before your fix and passes after. Check similar code for the same bug.
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