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I'm using `Observable.interval` to count down from 30 seconds to zero. After that, I want to use `flatMap` and continue another Rx chain. I'm not sure what the best way is to actually know when `after that` is. Using `flatMap` directly after the `interval` call obviously doesn't work since the `flatMap` gets called after each tick of the interval. RIght now I'm using `materialize` and checking if the notification `isOnComplete`. Is that the best way to handle this?

Maybe you’re looking for `timer` instead?

if you want to accumulate a value `scan` might help too.

It looks like `Timer` only emits once the timer finishes, which is not what I want since I'm using the values that `interval` produces.

`scan` seems unnecessary in conjunction with `interval`...I could theoretically use both `interval` and `timer` in two different chains to accomplish this