How would you avoid the Option.get?

gistfile1.scala

case class Dog(name: String, tailLength: Option[Int])

val dogs = Seq(Dog("Sparky", Some(85)), Dog("Rotty", None))
val (dogsWithTails, dogsWithoutTails) = dogs.partition(_.tailLength.isDefined)

if (! dogsWithoutTails.isEmpty)
  println("These dogs are missing tails: " +
    dogsWithoutTails.map(_.name).mkString(", "))

dogsWithTails.map(dog => {
  val tailLength = dog.tailLength.get // We know it exists because of the partition above
  // ⋮
})


// More realistic version:

case class Dog(name: String, tailLength: Option[Int], weight: Int)

val dogs = Seq(Dog("Sparky", Some(85), 10), Dog("Rotty", None, 15))
val (dogsWithTails, dogsWithoutTails) = dogs.partition(_.tailLength.isDefined)

if (! dogsWithoutTails.isEmpty)
  println("These dogs are missing tails: " +
    dogsWithoutTails.map(_.name).mkString(", "))

dogsWithTails.map(dog => {
  val tailLength = dog.tailLength.get // We know it exists because of the partition above
  someWorkWithSideEffects(tailLength, dog.weight)
})

def someWorkWithSideEffects(tailLength: Int, weight: Int) {
    // ⋮
}

Even though we know that all dogsWithTails have a tailLength I still might do:

dogsWithTails.map(dog => {
  dog.tailLength.map(tailLength => {
    someWorkWithSideEffects(tailLength, dog.weight)
  })
})

Even though we know that all dogsWithTails have a tailLength I still might do:

dogsWithTails.map(dog => {
  dog.tailLength.map(tailLength => {
    someWorkWithSideEffects(tailLength, dog.weight)
  })
})

Even though we know that all dogsWithTails have a tailLength I still might do:

dogsWithTails.map(dog => {
  dog.tailLength.map(tailLength => {
    someWorkWithSideEffects(tailLength, dog.weight)
  })
})