Why comment this line15 ,also get the same output?

# coroutines

[Tong Zhang]

Why comment this line15 ,also get the same output?

[Tong Zhang]

https://kotlinlang.org/docs/cancellation-and-timeouts.html#cancelling-coroutine-execution
I follow offical doc,I don't known why already call cancel() method then call join(),Why not join() first then cancel(), What is the point of calling the join() method after cancel()

[ephemient]

.join() blocks the current coroutine until the job is completed
.cancel() asynchronously cancels the job. it may continue running if it is in the middle of blocking code or withContext(NonCancellable) { }

`.cancel()`+`.join()` will cancel the job and wait for it to end. there is a .cancelAndJoin() convenience extension function which is equivalent
.join() + .cancel() will wait for the job to complete, and then cancel nothing. this is not useful