arrow-fx-stm/arrow.fx.stm/STM/tryPeek

tryPeek

open fun <A> TQueue<A>.tryPeek(): A?(source)

Same as TQueue.peek except it returns null if the TQueue is empty.

import arrow.fx.stm.TQueue
import arrow.fx.stm.atomically

suspend fun main() {
  //sampleStart
  val tq = TQueue.new<Int>()
  val result = atomically {
    tq.tryPeek()
  }
  //sampleEnd
  println("Result $result")
  println("Items in queue ${atomically { tq.flush() }}")
}
Content copied to clipboard

This function never retries.

See also

for a version that removes the front element

for a version that retries if the TQueue is empty.