Get reference to a coroutine job in coroutine scope

Question

In kotlin coroutine, most standard builder methods(such as launch) return a reference to a job,

does the design in this is to keep those reference in somethings such as a map/list(manage launched jobs "manually") or is there a way to find a launched job in a given scope?

 scope.launch { /* starting a coroutine in scope */ }

is there a way later to get the launched coroutine reference without keeping a reference for the launched job returned by scope.launch or should we manage this ourselve(eg. keep reference returned by launch)?

Answer 1

you need to save a reference to the parent job

val job = Job()
val scope = CoroutineScope(Dispatchers.IO + job)
scope.launch {
    ...
    job.children // this return all jobs started in this scope
}