I saw that the library supports ```<http://Dispatchers.IO|Dispatchers.IO> { println("Foo") } ```...

# coroutines

[CLOVIS]

I saw that the library supports

<http://Dispatchers.IO|Dispatchers.IO> {
    println("Foo")
}

which is the same as

withContext(<http://Dispatchers.IO|Dispatchers.IO>) {
    println("Foo")
}

Any idea why there are multiple ways to do it, and which one is preferred?

[Sam]

Huh! I never knew that. A bit of digging reveals this thread: https://github.com/Kotlin/kotlinx.coroutines/issues/428

[Sam]

I don't love that there are two ways to do the same thing 😞 I think I'll stick to withContext

[CLOVIS]

Ahah it's really weird to read about the Coroutines design from before structured concurrency.

[jw]

The first API is cursed

[Tgo1014]

is this from kotlin 2? The first option doesn’t work for me 🤔

[jw]

It's not tied to Kotlin version. it's an invoke operator in the kotlinx.coroutines library

[CLOVIS]

No, it's old. IDEA doesn't import it by default though, it's kotlinx.coroutines.import if you want to try it out.

(or, spell it out entirely:)

Dispatchers.IO.invoke {
    …
}

[Tgo1014]

This did the tricky! I kinda like it 👀

[jw]

I filed https://github.com/Kotlin/kotlinx.coroutines/issues/4199