The Deferred class, which was touched upon in the Parallel executing section, can be used to compute a single value. If we need to deal with a sequence of values, we can use channels. The Channel class contains the send and receive methods, which can be used in the following way:

fun main(args: Array<String>) = runBlocking<Unit> {
    val channel = Channel<Int>()
    launch {
        for (x in 1..50) channel.send(x * x)
    }
    repeat(50) {
        delay(500)
        println(channel.receive())
    }
    println("Done!")
}

Channels also allow us to transfer values from one coroutine to another safely in a multithreaded environment.