I don't know if `inikio` is exactly part of arrow (I can delete if this is an inappropriate venue), ...

# arrow

[conner]

I don't know if inikio is exactly part of arrow (I can delete if this is an inappropriate venue), but my question should be generic to any tagless-style interpreter -- is there a way to compose interpreters when using the suspend approach? I might also be misunderstanding the "right" way to do this.

Using the inikio example:

tailrec fun <A> Casino<A>.execute(): A =
  when(this) {
    is Done -> result
    is FlipCoin -> next(Random.nextFlipOutcome()).execute()
  }

What if I e.g. wanted to log something whenever FlipCoin is interpreted?

[Alejandro Serrano.Mena]

the easiest way is to make whatever other interpreter you need into the rewceiver

tailrec fun <A> OtherInterpreter.execute(casino: Casino<A>): A = when (this) {
  is Done -> result
  is FlipCoin -> {
    val outcome = Random.nextFlipOutcome()
    operationFromOtherInterpreter(outcome)
    execute(next(outcome))
  }
}

[conner]

Thank you! Is there an equivalent to something like Coproduct, where each interpreter doesn't have to be aware of the others?

[Alejandro Serrano.Mena]

that depends on your use case

with the advent of context receivers you would be able to write context(Casino, OtherTagless) fun doSomething(): A and then interpret as you wish

[conner]

oh yeah, great point. thanks again! (and thanks for the library and walkthrough docs!)