Code Comment Generator — illustrative example

INPUT
Add an intent comment to this JavaScript mapping. Original row IDs must remain available so reviewers can trace comparison results to their sources.
const copied = rows.map(row => ({ ...row }));

RESULT
// Retain source row IDs so reviewers can trace each comparison finding.
const copied = rows.map(row => ({ ...row }));

The comment explains why the IDs remain. The code still makes shallow copies; nested objects are shared.

REVIEW
Comments should explain intent or a non-obvious constraint. Repeating a straightforward line of code in prose adds noise.

This is a teaching example, not a live execution record.