Search across fields in C#
C# 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 SearchRows(rows, query) that returns the indexes of the (Name, City) rows where either field contains the query, ignoring case and surrounding whitespace in the query. An empty query matches every row.
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.