Totals by status in Rust
Rust interview exercise on Structs & Enums, 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 totals_by_status(orders) that sums order totals into a Totals struct, one field per Status. A struct, unlike a map, guarantees all three totals exist, and Default gives you the zeros.
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.