What happens if you combine 2 Flows and one of them throws a kotlinlang #coroutines

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Title

f

Florian

12/07/2020, 10:03 AM

What happens if you combine 2 Flows and one of them throws an exception? Will it be caught in a

catch

operator I add on the resulting (combined) Flow?

✔️ 1

l

louiscad

12/07/2020, 11:52 AM

Yes, you can also just try it on play.kotl.in or in a dummy/playground project

val flow1 = flow<Whatever> { null! }
val flow2 = flow<Whatever> { emit(whatever()) }
val flowToTest = combine(flow1, flow2) { a, b -> stuff(flow1, flow2) }
TODO("test catch operator")

f

Florian

12/08/2020, 9:28 AM

thank you

that play site is useful, I'll use that in the future

l

louiscad

12/08/2020, 9:28 AM

It's quite similar to a brand new project though

f

Florian

12/08/2020, 9:31 AM

well I'm using Android Studio

l

louiscad

12/08/2020, 9:31 AM

You can have IntelliJ next to it, doesn't hurt 🙂

Also, once you created the project I'm pretty sure you can open it in Android Studio if needed.

f

Florian

12/08/2020, 9:32 AM

makes sense, thank you

b

bezrukov

12/08/2020, 12:57 PM

you can just write

fun main() {
}

in any file in Android Studio at the top (below imports, if there are any), to test anything (Run button will appear in the left side bar to

fun main

)

l

louiscad

12/08/2020, 1:05 PM

It will take longer to compile than a blank project though

b

bezrukov

12/08/2020, 1:15 PM

yes, but you will have an access to the project codebase. Plus, if a project modularized enough compile will be quite fast (faster than opening idea 🙂) in leaf module

l

louiscad

12/08/2020, 2:36 PM

Well, I have IDEA open already 😄

f

Florian

12/09/2020, 11:17 AM

@bezrukov that's very cool, thank you

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