Time: 0:00
Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).
This bug belongs to the scope and closure bugs pattern
Every callback reports the last value, a counter never increments, UnboundLocalError on a variable you can see.
What went wrong: let total inside the if makes a second, separate total. The outer total never changes.
The fix: total = price * 0.9; without let.
Remember: to change an existing variable, don't write let again.
The pattern behind it: scope and closure bugs.
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<iframe src="https://trybughunt.com/embed/e77c669b-4fa3-4f8f-8d74-f3135c092d01" title="Debugging challenge: Member discount never reaches the total" width="100%" height="580" loading="lazy" style="border:1px solid #d4d4d8;border-radius:12px;max-width:760px"></iframe>
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