Today I found there are two functions in coroutine package;

coroutineScope

or

supervisorScope

. When should we use it instead of using

CoroutineScope(SupervisorJob())

? How do we cancel

coroutineScope

or

supervisorScope

?

Have you checked documentation of those functions?

coroutineScope

and

supervisorScope

will also share the same context as the caller (they just replace the Job), so eg the same dispatcher will be used for coroutines launched inside them.

CoroutineScope()

will have an otherwise empty context, containing only the Job. The former calls will also create jobs that are children of the caller's job, so if the caller is cancelled any coroutines launched inside them will also be cancelled. The latter creates a "root" job so you might leak coroutines.

CoroutineScope(coroutineContext + SupervisorJob(parent = coroutineContext[Job]))

is closer, although it still won't automatically join on any new coroutines as Andrey pointed out.