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whats wrong with this code?
why isActive not detecting the cancel
<https://pastebin.com/UcYmAAJj>

Your `launch` coroutine never suspends, so the `cancelAndJoin` is only ever reached when the `launch` coroutine is complete. This is because you are inside a `runBlocking` context, which means there is only one thread executing all coroutines in an event loop.

If you use `delay(100)` instead of `Thread.sleep` you should see the expected result.

Actually, I am wrong. You are not detecting `isActive == false` because cancellation is handled transparently by `delay`  (or even `Thread.sleep` through interrupts).
If you want to detect cancellation you'd have to use `try-finally`

any example for that?
to handle cancellation

Just surrounding your code with try-catch should make you receive a `CancellationException`

FYI there's also a dedicated <#C1CFAFJSK|> channel for future questions like this