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ZIO learning - composing environments / published by https://github.com/dacr/code-examples-manager #c265c5e9-5189-4ce1-bc82-8a93fd0cee60/4d57bf9352afa2f7b3d4afb2cbe2693f7a42d660
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// summary : ZIO learning - composing environments | |
// keywords : scala, zio, learning, pure-functional, @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 : c265c5e9-5189-4ce1-bc82-8a93fd0cee60 | |
// created-on : 2021-04-02T16:10:43+02:00 | |
// managed-by : https://github.com/dacr/code-examples-manager | |
// run-with : scala-cli $file | |
// --------------------- | |
//> using scala "3.2.2" | |
//> using dep "dev.zio::zio:2.0.13" | |
//> using dep "fr.janalyse::zio-worksheet:2.0.13.0" | |
// --------------------- | |
import zio.*, zio.worksheet.* | |
val logic: ZIO[Console & Random, Throwable, Unit] = for { | |
name <- ZIO.succeed("toto") | |
_ <- ZIO.logInfo(s"got name value : $name") | |
num <- Random.nextIntBetween(1,42) | |
_ <- Console.printLine(s"Hello $name") | |
_ <- ZIO.logInfo(s"$name processed") | |
} yield () | |
// ------------------------------------------------------------- | |
// Of course this is now useless as Console, System, Random, ... | |
// belong to the default environment and are now provided by default | |
// it was not the case in early ZIO releases | |
val layers = ZLayer.succeed(Console.ConsoleLive) ++ ZLayer.succeed(Random.RandomLive) | |
logic.provide(layers).unsafeRun |
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