Scala: Boolean to Option
Option().collect() is a good pattern for this kind of thing.
Option(myBool).collect { case true => someResult }
from the REPL:
scala> (Option(true).collect { case true => 3 }, Option(false).collect { case true => 3 })
res3: (Option[Int], Option[Int]) = (Some(3),None)
Scalaz has a way to do it with BooleanOps.option. That would allow you to write :
myBool.option(someResult)
If you don't want to add a Scalaz dependency, just add the following in your code :
implicit class RichBoolean(val b: Boolean) extends AnyVal {
final def option[A](a: => A): Option[A] = if (b) Some(a) else None
}
Starting Scala 2.13
, Option
has a when
builder for this exact purpose:
Option.when(condition)(result)
For instance:
Option.when(true)(3)
// Option[Int] = Some(3)
Option.when(false)(3)
// Option[Int] = None
Also note Option.unless
which promotes the opposite condition.