Sort table rows in JavaScript
JavaScript interview exercise on Practical, difficulty 2 of 3. Solve it in the editor beside a worked example, or cold in Interview mode with the example hidden; the tests run the moment you do.
Write sortRows(rows, key, dir) that returns a new array sorted by rows[i][key]. Numbers sort numerically; strings sort with localeCompare. dir is "asc" or "desc". Don't mutate rows.
Each exercise pairs a worked example with a twin problem to solve in a real editor; the tests run the moment you do. Interview mode hides the example: solve it from memory, without the hint or the solution, and it counts as solved cold. Progress is saved in your browser, and in your account if you sign in.