scala list of options to option of list
To convert a Scala list of options to an option of a list, you can use the sequence
method provided by the Option
companion object. Here is an example:
val list: List[Option[Int]] = List(Some(1), Some(2), Some(3))
val optionList: Option[List[Int]] = Option.sequence(list)
In the above code, we have a list list
of Option[Int]
elements. We call the sequence
method on the Option
companion object and pass in the list as an argument. This method converts the list of options into an option of a list. The resulting optionList
will be Some(List(1, 2, 3))
in this case.
If any of the elements in the original list are None
, the resulting option will also be None
. For example:
val listWithNone: List[Option[Int]] = List(Some(1), None, Some(3))
val optionListWithNone: Option[List[Int]] = Option.sequence(listWithNone)
In this case, the resulting optionListWithNone
will be None
because one of the elements in the original list is None
.
This approach allows you to convert a list of options into an option of a list in Scala.