map and filter in RxJS
RxJS interview exercise on Transforming, difficulty 1 of 3. Solve it in the editor beside a worked example; the tests run the moment you do.
Write squareOdds(source$): keep the odd numbers and emit their squares, in order, at the moment they arrive.
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.