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Hey. I’m going through the Coroutines docs and I’m a bit confused about the `.cancelAndJoin()` method. What is it good for? Why would I want to wait until the coroutine actually finishes the cancellation? I bet there is a pretty clear use case, but I just can’t see it.

You might want to make sure a coroutine releases a resource before you access it?

You can call `cancel()` on a Coroutine that's already completed exceptionally. 

Suppose user have clicked a button started a long task.

Now user comes back after some time to app . Now he/she forgot that he has already started a long task and again clicks the button. 

Now in this case *.cancelAndJoin()* method can come I handy . You can cancel the already running coroutine , start again and wait for it until it finishes

Otherwise it would have launched another coroutine