Subscriptions that end with the component in Angular
Angular interview exercise on RxJS interop, difficulty 2 of 3. Solve it in the editor beside a worked example; the tests run the moment you do.
StopwatchComponent counts `ticks` (a signal) from an interval of 10 ms that starts on start() and is paused by stop(); the subscription must end when the component is destroyed. Render the ticks in <output> with Start and Stop buttons.
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