Questions

1. What would be the proper effect to represent getting the first element of a list, such as a list of tweets? What about a user's information from the database for a given userId?
2. What are the range of possible values of the following expression: Option(scala.util.Random.nextInt(10)).fold(9)(_-1)?
3. What will be the result of the following expression?

Try[Int](throw new OutOfMemoryError()).filter(_ > 10).recover {
  case _: OutOfMemoryError => 100
}

4. Describe the result of the following expression:

Future[Int](throw new OutOfMemoryError()).filter(_ > 10).recover {
  case _: OutOfMemoryError => 100
}(20)

5. Given the following function, what would be the result of the following call: either(1)?

def either(i: Int): Boolean = 
  Either.cond(i > 10, i * 10, new IllegalArgumentException("Give me more")).forall(_ < 100)

...