Review Summary

Your solution is approved because it correctly implements Array.prototype.sort2 with the required behavior and constraints. You define sort2 via the provided scaffold, use a custom bubble sort algorithm, mutate the array in place, and return the original array reference rather than creating a new one. The default comparison uses String(a) and String(b) and orders based on character codes, which matches the specified behavior, including numeric examples like [3, 12, 2, 11].sort2() producing [11, 12, 2, 3]. When a compareFunction is provided, you correctly use its numeric result to determine when to swap elements, so custom sorting logic works as expected. You also respect the constraints of not overriding Array.prototype.sort and not calling the built-in sort, relying entirely on your own algorithm. As a minor, non-blocking improvement, you could consider storing String(a) and String(b) in local variables inside the comparator to avoid repeated conversions and make the intent slightly clearer, but this is not required for correctness. Overall, you met the functional and technical requirements well—nice work.

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