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ah ok, I was thinking there might be major reworking of code needed..

Nope, there is almost no work (only fix new warnings if you want), but in general it should be backward compatible
But migration of old coroutines may be not so straight forward

what is old coroutines? what version is old?

I'm talking about Kotlinx.coroutines library

Versions after 0.26 introduced a lot of changes, such as Structured concurrency

But in general it's more about library update, not language itself. But it requires If you use some old version of kotlinx.coroutines and want to migrate to 1.3

&gt; Nope, there is almost no work (only fix new warnings if you want),

this is not accurate if you're on a version of kotlinx.coroutines prior to 0.26. As you mentioned, the structured coroutines change is not small. Cancellation semantics are different, and I got a bunch `implementation should be intrinsic` errors from `suspendCoroutineOrReturn`, as that function seems effectively depricated and scheduled for removal sooner rather than later.

<https://github.com/Kotlin/kotlinx.coroutines/blob/master/COMPATIBILITY.md#migration-to-100-version-with-kotlin-13>

<@U0ZFBBUBU> yes, and I mentioned this on my next message, that it's not so easy with very old kotlinx.coroutines

ok I'm a little confused, my import packages start with kotlinx.coroutines.experimental, so that is not what you guys are talking about, right? my coroutine usage code is only from 2017.. for me it should be little effort to upgrade to the latest, correct?

this is kotlinx.coroutines with experimental package, correct. Which version do you use?

Check version of dependency `org.jetbrains.kotlinx:kotlinx-coroutines-*`

`org.jetbrains.kotlinx:kotlinx-coroutines-core:jar:0.22.5`

so if it seems to work, better for me to leave it alone for now?

yes I would do that eventually, I was just trying to determine if i needed to do this soon

Biggest difference is strucutred concurrency
<https://github.com/Kotlin/kotlinx.coroutines/releases/tag/0.26.0>

I'm not entirely sure what that is, I'll have to read up on it

I use coroutines mostly with `future { }` in my kotlin code

I also have some javascript code with coroutines but I don't know when I will need that again, are there much changes in regards to them with javascript?

Even to use with future you need CoroutineScope now

See details in this blog post
<https://medium.com/@elizarov/structured-concurrency-722d765aa952>