OptionSugar
Related Docs:
object OptionSugar
| package scalactic
Implicit class that adds a toOr method to
Option, which converts Some to Good,
None to Bad.
Implicit class that adds a toOr method to
Option, which converts Some to Good,
None to Bad.
Trait providing an implicit class that adds a
toOrmethod toOption, which convertsSometoGood,NonetoBad.You can use the
toOrmethod to record information about why a processing of nestedOptions resulted inNone. For example, the followingforexpression results inNoneif either the passed optionalPersonisNoneor else if the contained optional age isNone:scala> case class Person(name: String, age: Option[Int]) defined class Person scala> def ageOf(person: Option[Person]) = | for { | per <- person | age <- per.age | } yield age ageOf: (person: Option[Person])Option[Int] scala> ageOf(Some(Person("Ralph", Some(32)))) res0: Option[Int] = Some(32) scala> ageOf(Some(Person("Curt", None))) res3: Option[Int] = None scala> ageOf(None) res2: Option[Int] = NoneIf you instead populate the
forexpression withOrs, supplying an error message or other "bad" value to thetoOrmethod in case ofNone, you'll get an indication of which part failed if aNoneis encountered:scala> import OptionSugar._ import OptionSugar._ scala> def ageOf(person: Option[Person]) = | for { | per <- person toOr "no person here" | age <- per.age toOr "ageless person" | } yield age ageOf: (person: Option[Person])org.scalactic.Or[Int,String] scala> ageOf(Some(Person("Ralph", Some(32)))) res1: org.scalactic.Or[Int,String] = Good(32) scala> ageOf(Some(Person("Curt", None))) res2: org.scalactic.Or[Int,String] = Bad(ageless person) scala> ageOf(None) res3: org.scalactic.Or[Int,String] = Bad(no person here)