The latest value per window in RxJS
RxJS interview exercise on Timing, difficulty 3 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 latestEvery(source$, ms): a value opens a window of ms milliseconds; when it closes, emit the most recent value seen (which may be a later one), then wait for the next value to open another. A window still open when the source completes closes first, then the stream completes.
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.