solution

[Vitalii120296]

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[mateacademy-ai-mentor]

Review Summary

I am approving this submission because your Jest tests clearly cover all the core behaviors required for restoreNames, including restoring firstName when it is missing or undefined, preserving existing firstName values, and confirming that the function mutates the original users array rather than returning a value. You also explicitly test the two specified examples (Jack Holy with firstName: undefined and Mike Adams with no firstName), which aligns well with the task requirements. There are no critical blockers: the tests, as written, would allow a correct implementation to satisfy all checklist items.

For future improvement, consider aligning the import/export style with the implementation (e.g., module.exports = { restoreNames } vs. default export) so tests and code integrate smoothly. You could also refine one test description (e.g., change “should return firstName if it was undefined” to “should restore firstName if it was undefined”) to avoid suggesting the function returns that value. If you want to go further, adding a couple of edge-case tests (empty array, null firstName, or fullName with middle names) would make the specification even more robust. Overall, this is solid, requirement-compliant test coverage—nice work.

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