Hey guys, whats the difference between ```fun CoroutineScope.foo() = launch{//some stuff} vs fun foo...

# coroutines

[viralshah]

Hey guys, whats the difference between

fun CoroutineScope.foo() = launch{//some stuff}
vs
fun foo() = CoroutineScope { launch{//some stuff}}
vs
fun foo(){ coroutineScope { launch { // some stuff } } }

? Thanks

[CLOVIS]

The first reuses an existing CoroutineScope, the second and the third ones create a new one. Not sure what the differences are between those though.

[viralshah]

Is it possible to know which scope is being reused in the first one?

[Mark Murphy]

it is whatever you call foo() on

[Dico]

None of these are the same.
1. Is a signature to start a coroutine and return immediately, with structured concurrency pattern.
2. I am not sure this even compiles.
3. Needs to be suspend, creates a derivative coroutine scope and doesn't return until all children of that scope have died.

[rkeazor]

The 3 one Creates a CoroutineScope that inherits the context that was used at the call site. Its good to use in classes that don't have a coroutineScope. Simiarly the first one is a extension function, of CoroutineScope, so you will have access to things like launch within that function. . Never seen the second one before 😅