tryTake

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

Try to take the value of MVar, returns result as an Option.

import arrow.core.*
import arrow.fx.*
import arrow.fx.extensions.io.async.async
import arrow.fx.extensions.io.monad.flatMap

fun main(args: Array<String>) {
//sampleStart
val mvar = MVar.factoryUncancellable(IO.async())

mvar.just(5).flatMap { v ->
  v.tryTake()
}.unsafeRunSync() == Some(5)

mvar.empty<Int>().flatMap { v ->
  v.tryTake()
}.unsafeRunSync() == None
//sampleEnd
}