Simpler Coroutines Scopes

CoroutineScopeAndJob.kt

import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Job

interface CoroutineScopeAndJob : CoroutineScope {
  val job: Job
}

ExampleAfter.kt

class ExampleAfter : CoroutineScopeAndJob by JobBasedScope(Dispatchers.IO)

ExampleBefore.kt

class ExampleBefore : CoroutineScope { 
  private val job = Job()
  override val coroutineContext: CoroutineContext get() = job + Dispatchers.IO
}

JobBasedScope.kt

import kotlinx.coroutines.CoroutineDispatcher
import kotlinx.coroutines.Job
import kotlin.coroutines.CoroutineContext

class JobBasedScope(val dispatcher: CoroutineDispatcher) : CoroutineScopeAndJob {
  override val job = Job()
  override val coroutineContext: CoroutineContext get() = job + dispatcher
}