Solution

[PrimaSB]

No description provided.

[mateacademy-ai-mentor]

Review Summary

The implementation has a critical flaw in the comparison logic: the default compare function (a, b) => String(a) > String(b) returns true for equal elements, which violates the expected compare function contract and causes incorrect swapping during sorting. This breaks correct behavior for arrays containing duplicate or equal values. Additionally, there's a medium-severity out-of-bounds access: the inner loop condition j < copy.length allows access to copy[j + 1] when j is at the last valid index, resulting in undefined comparisons. Both issues must be fixed to ensure correctness — specifically, replace the default comparison with String(a).localeCompare(String(b)) or a proper -1/0/1 ternary, and change the inner loop bound to j < copy.length - 1. These are functional blockers, not stylistic preferences, so changes are required before approval.

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[mateacademy-ai-mentor]

Review Summary

Your solution is approved. All critical issues from the previous review have been successfully addressed: the default comparison function now returns -1/0/1 values instead of boolean values, and the inner loop bound correctly prevents out-of-bounds access by using j < this.length - 1. All six checklist items are satisfied, including proper sort2 implementation on Array.prototype, preserved scaffold pattern, in-place sorting with return this, string comparison, custom compare function support, and avoiding the built-in sort method. The implementation correctly handles all test cases for string sorting, numeric sorting, and custom compare functions. Great work implementing the bubble sort algorithm correctly!

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