practical_coroutines_16.kt

fun main() {
    runBlocking {
        launch(Dispatchers.Default) {
            println("Hello1")
            a()
            println("Hello2")
        }
        println("Hello3")
    }
}
suspend fun a() = coroutineScope {
    println("Hello4")
    delay(100)
    println("Hello5")
}

Output:
Hello3 
Hello1
Hello4
Hello5
Hello2

// Note how Hello3 is printed before Hello1 since launch isn't blocking 
// the main thread
// 
// Also note how Hello2 is printed after Hello5 
// since coroutineScope suspends the calling f() execution
// 
// It's just that runBlocking will wait for all it's child to 
// complete before completing itself while 
// it blocks the thread it was called on.