sth.scala

class Animal(name: String, size: Int)
object Animal {
  def apply(name: String, size: Int) = new Animal(name, size)
  def unapply(a: Animal): Option[(String, Int)] = Option((a.name, a.size))
}

def myHumorToday: Animal = Animal("Dog", scala.util.Random.nextInt(50))

def depsOnMyHumor(a: Animal) = a match {
     case myHumorToday => "you got lucky boy!"
     case _ => "not today"
}
/*<console>:14: warning: patterns after a variable pattern cannot match (SLS 8.1.1)
       case myHumorToday => "you got lucky boy!"
            ^
<console>:15: warning: unreachable code due to variable pattern 'myHumorToday' on line 14
       case _ => "not today"
                 ^
<console>:15: warning: unreachable code
       case _ => "not today"*/
       
scala> depsOnMyHumor(Animal("Dog", 20))
res17: String = you got lucky boy!

scala> depsOnMyHumor(Animal("Dog", 20))
res18: String = you got lucky boy!

scala>     depsOnMyHumor(Animal("Dog", 20))
res19: String = you got lucky boy!

scala>     depsOnMyHumor(Animal("Dog", 20))
res20: String = you got lucky boy!

scala>     depsOnMyHumor(Animal("Dog", 20))
res21: String = you got lucky boy!