as described in the title, the requirement is to make a page similar to making a phone call, which requires a countdown, which needs to be terminated in three cases:
in any case, I can"t figure out how to isolate side effects.
is there any code or pseudo code to refer to?
call the function in the timer to take the state, and then deal with it accordingly. What exactly does the side effect refer to?
it would be tedious to isolate the side effects with native ones. I wrote a simple one with RxJS for inspiration
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