directStyleVsKyo.scala

import scala.annotation.{ nowarn, tailrec }

import kyo.*

val a = 1

def doSomething(): Unit = {
  println("do")
  println("something")
}

object inKyo {
  val doSomething: Unit < IO = IO({
    println("do")
    println("something")
  })
}

trait Impure

object usingImpure {
  def doSomething(
      using
      Impure
    ): Unit = {
    println("do")
    println("something")
  }

  val x: Impure ?=> Unit = doSomething
}

def doSomethingElse(n: Int): Unit = {
  (0 until n).foreach(_ => doSomething())
}

def call(): Unit = doSomethingElse(3)

@nowarn // @effect
def factorial(n: Int): Int = {
  if (n == 0) 1
  else n * factorial(n - 1)
}