Only the latest: switchMap in RxJS
RxJS interview exercise on Flattening, difficulty 2 of 3. Solve it in the editor beside a worked example; the tests run the moment you do.
Write latestResults(query$, search): for each query call search(query) and emit its results; when a new query arrives, drop whatever the previous search would still return.
Each exercise pairs a worked example with a twin problem to solve in a real editor; the tests run the moment you do. Progress is saved in your browser, and in your account if you sign in.