solution

[blabunch]

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[mateacademy-ai-mentor]

Review Summary

I am requesting changes because the core requirement of the task is not yet fulfilled: Array.prototype.sort is not actually implemented using the predefined [].__proto__.sort2. Right now, src/arrayMethodSort.js only defines sort2 on [].__proto__, so calling [].sort() will still use the native implementation instead of your custom one. To meet the task requirements, you need to install a delegating sort implementation inside applyCustomSort(), for example attaching a function that calls this.sort2(compareFunction) on the array prototype (or [].__proto__). This is a critical blocker because it means the main behavior the tests expect—overriding Array.prototype.sort to use your bubble-sort logic—is missing.

Concretely, inside applyCustomSort(), add something like:

• Array.prototype.sort2 = function(compareFunction) { /* your current bubble sort code */ };
• Array.prototype.sort = function(compareFunction) { return this.sort2(compareFunction); };
  so that running applyCustomSort() configures both methods. As a minor improvement (not a blocker), you could also validate that compareFunction, if provided, is a function and throw a TypeError otherwise, which more closely matches the native sort behavior. Your bubble-sort implementation and default string-based comparison look good, so once you wire up sort to delegate to sort2, you should be in line with the task requirements.

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[mateacademy-ai-mentor]

The task requires implementing Array.prototype.sort using the predefined [].__proto__.sort2. This file only defines sort2 and never adds/overrides Array.prototype.sort. Add a delegating implementation (for example: [].__proto__.sort = function(compareFunction) { return this.sort2(compareFunction); };) inside applyCustomSort() so the exported function installs both methods.

[mateacademy-ai-mentor]

Review Summary

Your solution is approved because it meets the core requirements of the task: you define a custom Array.prototype.sort2 and correctly delegate Array.prototype.sort to use this implementation, and the function behaves like native sort in terms of accepting an optional compareFunction and returning the original array. The validation of the compareFunction and the presence of a default comparator that falls back to string conversion both align well with MDN-style behavior and ensure correct basic functionality. There are no critical blockers such as missing features, broken runtime behavior, or violations of the explicit requirements.

A few aspects could be improved in future iterations: your bubble-sort implementation is O(n^2) and thus not ideal for very large arrays, so if performance becomes important you might consider a more efficient algorithm such as quicksort or mergesort. Also, native Array.prototype.sort has some subtle behaviors (like handling sparse arrays, this coercion via ToObject, and exact error message text) that your version only partially mirrors; these are not required for this task, but they are good areas to explore if you want closer spec parity. Overall, the code is clear, focused, and functionally correct for the assignment—nice work.

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