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kotlinlang

This week, my version of how to race coroutines in Kotlin. I think the ability to customize the race with operators like `filter()` makes `channelFlow()` an amazing solution for this. <https://medium.com/@sam-cooper/custom-kotlin-coroutine-races-77161141b2ac>

The first place I saw this technique was in <https://github.com/Kotlin/kotlinx.coroutines/issues/2867#issuecomment-1458487275|this comment> from Louis Wasserman—does anyone know if it's been used in the wild before that?

you may already be aware of this, but the Arrow library provides race operations out of the box <https://arrow-kt.io/learn/coroutines/parallel/#racing>

Yeah, I think I have used the Arrow `raceN` function before :+1:. Can it express something like `raceNotNull`, though? That extra customizability is the reason I really love the `channelFlow` method.

I'll add the mention of Arrow to my article either way, that's a good call

&gt; Can it express something like `raceNotNull`, though?
no, but you have given me an idea for a new function :smile:

:smile: maybe you can implement it with a `channelFlow` :wink: