Making asynchronicity explicit

As you saw in the previous chapter, it is very easy to create an asynchronous function in Kotlin. Here is an example:

fun CoroutineScope.getResult() = async { 
   delay(100) 
   "OK" 
}

However, this asynchronicity may be an unexpected behavior for the user of the function, as they may expect a simple value.

What do you think the following code prints?

println("${getResult()}")

For the user, the preceding code somewhat unexpectedly prints the following instead of "OK":

> Name: DeferredCoroutine{Active}@...

Of course, if you have read Chapter 6, Threads and Coroutines, you will know that what's missing here is the await() function:

println("${getResult().await()}")

But it would have been a lot more obvious if we'd named our function accordingly, by adding an async suffix:

fun CoroutineScope.getResultAsync() = async { 
   delay...