gistfile1.scala

case class User(id: Int, name: String, avatarUrl: Option[String])

val kevin = User(1, "Kevin", None)
val jeremy = User(1, "Jeremy", Some("http://someurl.de"))

val users = Seq(kevin, jeremy)

users.forEach { // iterate over the user sequence
  user => user match { // match every entry in the value 'user'
    case User(name, Some(url)) => 
      println (s"User $name has an avatar at $url")  // this executes only if it is a User with an URL set
    case User(name, None) => 
      println (s"User $name has no avatar") // this executes only if it is a User with no URL set
    case other => 
      println(s"not a user but a $other") // this executes in all other cases and binds the object to the name 'other'
  }
}