scala3 feature examples - using extension methods / published by https://github.com/dacr/code-examples-manager #d956f95d-7271-492d-be99-f0b63d89a79e/8b9075506260c83baa0b5bfd6c25c8ec764d314a

scala3-feature-extension-methods.scala

// summary : scala3 feature examples - using extension methods
// keywords : scala3, tutorial, @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 : d956f95d-7271-492d-be99-f0b63d89a79e
// created-on : 2021-11-15T20:12:08+01:00
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file

//> using scala "3.1.1"

import java.util.UUID

extension (uuid:UUID)
  def sexy:String = s"UUID#${uuid.toString}"

extension [T](xs: List[T])
  def cadr = xs.tail.head


@main def go() =
  println(UUID.randomUUID().sexy)
  println(List(1,2,3).cadr)