Cats effect 3.x Repl, useful when creating a custom Repl for your Cats effect code

Repl.scala

import cats.effect.{IO, IOApp}

// Emits intro text, then prompts for some command. Will exit upon 'exit'
// Note, these programs are values, as expected
object Repl extends IOApp.Simple {

  val repl: IO[Unit] = {
    for {
      input <- IO.println(">>> ") *> IO.readLine
      _ <- IO.println(s"You entered: $input") *> (if (input == "exit") IO.unit else repl)
    } yield ()
  }

  override def run: IO[Unit] = for {
    _ <- IO.print("Hello, please enter values, and exit loop with 'exit'") *> repl
  } yield ()
}