How To Access The Failed Value From Either?

[Ezirius]

A good description of the issue can be found here:

In the example below, we have:

• Type: Either<RangedNumberValueFailuresAbstract<int>, int>
• If No Error: right(number)
• If Error: left(RangedNumberValueFailuresAbstract.invalidNumber(failedNumberValue: number))

If we need to access the failedNumberValue in (failedNumberValue: number), how would we do it?

[Ezirius]

A good answer to the issue can be found here:

In the latter, the failedNumberValue is accessed as follows:

   final actual = testClass.getValue.fold(
     (l) => (l as RangedNumberValueFailuresAbstract).failedNumberValue,
     (r) => r,
   );