I said stay calm

I should have given an alternative solution in the last blog post. This uses Switch so that the timer is only subscribed to once. Switch is rather neat int hat it takes a sequence of observables and propagates the value of the latest element of this sequence.

var ticktock = Observable.Interval(TimeSpan.FromSeconds(1));

var clock =
         tick => Observable.Interval(TimeSpan.FromSeconds(0.1))
                 .Select(tenths => new { Tick = tick, Tenths = tenths })))
    .Select(anon => anon.Tick + "." + anon.Tenths);

clock.Subscribe(x => Console.WriteLine(x));

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