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Created July 17, 2023 15:29
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Cats effect 3.x Repl, useful when creating a custom Repl for your Cats effect code
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 ()
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