[Poll vs Receive] #poll #coroutine #kotlin

output.txt

Received: Apple
Sent: Apple
Received: Banana
Sent: Banana
Channel is empty
Channel is empty
Channel is empty
Done!

PollExample.kt

fun main() {

  val fruitArray = arrayOf("Apple", "Banana", "Pear", "Grapes", "Strawberry")

  val kotlinChannel = Channel<String>()

  runBlocking {

    launch {
      for (fruit in fruitArray) {
        if (fruit == "Pear") {
          break
        }
        kotlinChannel.send(fruit)
        println("Sent: $fruit")
      }
    }

    launch {
      repeat(fruitArray.size) {
        val fruit = kotlinChannel.poll()
        if (fruit != null) {
          println("Received: $fruit")
        } else {
          println("Channel is empty")
        }

        delay(500)
      }

      println("Done!")
    }
  }
}