ghik

import RegexInterpolations._

val str = "My hovercraft is full of eels"
str match {
  case r"""My (\w+)$vehicle is full of (\w+)$stuff""" =>
    println(s"It is $stuff that my $vehicle is full of.")
}

ghik

import scala.language.implicitConversions

final class Opt[+A] private(private val value: Any) extends AnyVal {

  def isEmpty = value == null
  def isDefined: Boolean = !isEmpty
  def get: A = value.asInstanceOf[A]
  
}

ghik

class Base {
  def work() {
    // do some work
  }
}
 
trait Logging extends Base {
  override def work() {
    log("Doing work")
    super.work()

ghik

// full implementation at https://github.com/ghik/selftyped

trait Base extends SelfTyped {
  def same[T: Self]: T

  def twice[T: Self]: T
}

trait SimpleSame extends Base {
  // we can always safely return 'this' where self-type is expected