hard20 pts · first answer countskotlin-coroutineserror-handling

Polling loop that ignores cancellation

After the ViewModel is cleared, logs show this loop still logging errors over and over. Why?

viewModelScope.launch {
  while (true) {
    try {
      delay(1000)
      poll()
    } catch (e: Exception) {
      log(e)
    }
  }
}

A.viewModelScope is never cancelledB.delay() does not respond to cancellation inside a try block, so the coroutine keeps sleeping and polling until the system kills the process or the user force-stops the appC.A while (true) loop can never be cancelled in KotlinD.catch (e: Exception) also catches the CancellationException thrown by delay(), so the loop swallows cancellation and keeps going; rethrow it or catch only specific exceptions

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Polling loop that ignores cancellation

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