hello world with cats-effect / published by https://github.com/dacr/code-examples-manager #ccf93eab-dd65-4711-81ad-69eccccf71b1/e7a451f5c8f86b131666c1a061b8bb9bcc4ef60c

cats-learning-1-hello.sc

// summary : hello world with cats-effect
// keywords : scala, cats, effect, learning, pure-functional, helloworld, @testable
// publish : gist
// authors : David Crosson
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2)
// id : ccf93eab-dd65-4711-81ad-69eccccf71b1
// created-on : 2022-01-06T17:55:38+01:00
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file

// ---------------------
//> using scala  "3.3.0"
//> using dep "org.typelevel::cats-effect:3.5.0"
// ---------------------

import cats._
import cats.effect.IO
import cats.effect.unsafe.implicits.global

val program = for {
  _    <- IO { println("Hello world") }
} yield ()

program.unsafeRunSync()