tryPeek

abstract fun tryPeek(): Kind<F, Option<A>>

Tries to peek a value from the Queue. Returns immediately with either None or a value Some. In contrast to tryTake, tryPeek does not remove the value from the Queue.

import arrow.fx.*
import arrow.fx.extensions.fx

//sampleStart
suspend fun main(args: Array<String>): Unit = IO.fx {
  val queue = !Queue.unbounded<Int>()
  val none = !queue.tryPeek()
  !queue.offer(1)
  val one = !queue.tryPeek()
  val one2 = !queue.tryPeek()
  !effect { println("none: $none, one $one, one2: $one2") }
}.suspended()
//sampleEnd

See Also

peek

tryTake