Time: 0:00
Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).
This bug belongs to the mutation and copying bugs pattern
Assignment does not copy, a shallow copy still shares its contents, and mutating methods return None.
What went wrong: new Array(3) makes 3 empty slots. map() skips empty slots, so nothing is filled in.
The fix: return Array.from({ length: count }, (_, i) => i + 1);
Remember: use Array.from({ length: n }, fn) to build a list of n items.
The pattern behind it: mutation and copying bugs.
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