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[MartaKurdylo]

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[mateacademy-ai-mentor]

Review Summary

I am approving your solution because it correctly implements createTree(element, data) with recursion, builds the nested <ul>/<li> structure from the object keys, and uses the provided DOM element as required. The core functionality appears sound and meets the task requirements.

There are two robustness improvements you should keep in mind for future work: first, when you iterate over data with for...in, you should either check Object.prototype.hasOwnProperty.call(data, key) or use Object.keys(data) to avoid accidentally including inherited enumerable properties. Second, before calling element.appendChild(ul), it’s safer to ensure element is not null (for example, if document.querySelector('#tree') fails) to prevent a runtime error. As an additional small enhancement, you could also guard the initial call, e.g. only calling createTree(tree, food) if tree exists. Overall, the solution is clear, functional, and only needs these minor safety checks for production-grade robustness.

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[mateacademy-ai-mentor]

Using for...in over data can iterate inherited enumerable properties. Consider filtering with Object.prototype.hasOwnProperty.call(data, key) or iterate Object.keys(data) instead to ensure only the object's own keys are used.

[mateacademy-ai-mentor]

If element is null (for example document.querySelector('#tree') didn't find the node), element.appendChild(ul) will throw. Add a guard to ensure element is a valid DOM node before appending (or early-return if it's falsy).