Can we get a Job that is already completed?

What do you mean? Are you asking if we can still use a completed Job?

Oh sorry for ambiguous. I meant like the follow

val job = // some way
assert(job.isCompleted)

@wcaokaze Still unclear what you want to do, your code doesn't make sense in regards to what you told first

For example, I want to make a button to download some data.

private var fetchingJob: Job

fun onButtonClicked() {
   if (!fetchingJob.isCompleted) return

   fetchingJob = launch (UI) {
      // ...
   }
}

I still don't understand what you're trying to do @wcaokaze

private var fetchingJob: Job? = null

fun onButtonClicked() {
    if (!fetchingJob?.isCompleted == true) return

    fetchingJob = launch(UI) { ... }
}

Do you mean something like this?

Yep, currently I use it.

@wcaokaze Could you explain in English what you're trying to do? My mental compiler has bugs and inference to what you're trying to do exactly doesn't work

As I understand you are trying to create Job instance that already completed, with isCompleted=true by default. There is no such implementation now, you can write your own (job is just an interface), but I would just use

null

as default value

@gildor Thanks!!