Trait providing an implicit class that adds a toOr
method to
Option
, which converts Some
to Good
,
None
to Bad
.
You can use the toOr
method to record information about why
a processing of nested Option
s resulted in None
.
For example, the following for
expression results in
None
if either the passed optional Person
is
None
or else if the contained optional age is None
:
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] = None
If you instead populate the for
expression with Or
s,
supplying an error message or other "bad" value to the toOr
method
in case of None
, you'll get an indication of which part
failed if a None
is 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)
- Companion:
- object
- Source:
- OptionSugar.scala
Type members
Classlikes
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
.
- Source:
- OptionSugar.scala
Implicits
Implicits
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
.
- Source:
- OptionSugar.scala