Time: 0:00
Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).
This bug belongs to the logic errors pattern
The wrong operator, an inverted condition, a formula the right way round but backwards.
What went wrong: indexOf returns a position. Position 0 counts as false, and -1 (not found) counts as true, so the answers are backwards.
The fix: return items.includes(name);
Remember: never use a position as a yes/no answer.
The pattern behind it: logic errors.
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