For example, let's say that you want to have a coroutine running in a specific thread, and at the same time you want to set an exception handler for it. To do this, you can combine both by using the plus operator:

main(args: Array<String>) = runBlocking {
    val dispatcher = newSingleThreadContext("myDispatcher")
    val handler = CoroutineExceptionHandler({ _, throwable ->
        println("Error captured")
        println("Message: ${throwable.message}")
    })

    launch(dispatcher + handler) {
        println("Running in ${Thread.currentThread().name}")
        TODO("Not implemented!")
    }.join()
}

In this case, we are combining a single thread dispatcher with an exception handler, and the coroutine will behave accordingly:

You can, of course, create a variable to hold the combined contexts, to avoid having to use the plus more than once:

val context = dispatcher + handler

launch(context) { ... }