arrow-fx-stm/arrow.fx.stm/STM/setValue

setValue

open operator fun <A> TVar<A>.setValue(thisRef: Nothing?, property: KProperty<*>, value: A)

Use a TVar using property delegation.

import arrow.fx.stm.TVar
import arrow.fx.stm.atomically

suspend fun main() {
  //sampleStart
  val tvar = TVar.new(10)
  val result = atomically {
    var x by tvar
    x = 20
  }
  //sampleEnd
  println(result)
}