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scalatype-erasurescala-option

Scala - Option.getOrElse() "type erasure"?

I am trying to use the Option.getOrElse() method but it returns etiher Any or ScalaObject instead of an instance of the correct class that the Option was parametrized with. I can't find any mention about this problem and it does not seem like it should be there. What am I doing wrong?

class MyClass {

  def isOk = true

}

val myVal = Some(new MyClass) // :Option[MyClass]

val check = myVal.getOrElse(false).isOk

Can't call the isOk method because it tries calling it upon Any.

Solution

  • You are trying to call method isOk on base class of MyClass and Boolean (Any).

    Try this:

    scala> class MyClass(b: Boolean) { def isOk = b }
defined class MyClass

scala> val myVal = Some(new MyClass(true))
myVal: Some[MyClass] = Some(MyClass@35d56bbe)

scala> myVal.map{_.isOk}.getOrElse(false)
res0: Boolean = true

scala> myVal.getOrElse(new MyClass(false)).isOk
res1: Boolean = true