The Scala Option type is an algebraic data type (ADT) that represents an optional value. It can also be viewed as List that can contain either one or no elements. It is a safe replacement for a null reference that you might have used if you have programmed in Java, C++, or C#.
Using Option
Manipulating instances of Option
The following is a simplified definition of the Option ADT:
sealed trait Option[+A]
case class Some[A](value: A) extends Option[A]
case object None extends Option[Nothing]
The Scala SDK provides a more refined implementation; the preceding definition is just for illustrative purpose. This definition implies that Option can be either of the following two types:
- Some(value), which represents an...
