Short-circuit a list of Cats Effect (IO) using a foldLeft

IOShortCircuit.scala

  object Main extends App {
    val l = List(IO(println(1).asRight), IO(println(2).asRight), IO("foo".asLeft), IO(println(4).asRight))

    val io = l.foldLeft[IO[Either[String, Unit]]](IO(Right(())))((prev, next) => {
      prev.flatMap({
        case Left(err) => IO(Left(err))
        case Right(_) => next
      })
    })

    println(io.unsafeRunSync())
    // will print:
    // 1
    // 2
    // Left(foo)
  }