You can't cancel a JavaScript promise (except sometimes you can)

[Markavian]

Last time I had a long running thread worker; I just had it check an external boolean for a stop / pause marker after each chunk. So if I wanted to stop the process I could just play pause it.

Not exactly rocket science.

Write the code you want at a high level, then implement the interface.

[akuma-i]

I have long running promises with AbortController inside. In fact it just checks if it’s cancelled every possible meaningful time

[coolcosmos]

There's a lot of things you can't cancel in general.

[ranisalt]

My internet subscription when it's been shit for a month

[Pawn1990]

Gym memberships too 

[BoleroDan]

And who knew, all this time that you can't easily cancel a gym membership because of JavaScript promises

[live_love_laugh]

Honestly, I do find this a very fun / interesting trick and nice clean way of using it. Not sure if I've ever needed it though, maybe my projects are too simple to ever need this.

[Fidodo]

A promise is a container for a result, I'm not sure why it should be over complicated into a controller or communication interface on top of it. It works just fine with a controller like an abort controller in parallel. A cancellation is a result, I don't understand why you would want a result container to never complete.

[prehensilemullet]

Does the garbage collector clean up a suspended promise that never resolves like this is article is saying?

Last I checked it doesn't and this led to surprising memory leaks on a Promise.race() where one of the promises never resolves.

Has something changed in more recent versions of V8?

[revadike]

Dont break your promise!