How to return a particular data class from a list of sealed classes-CodePudding

I would like know how I can return a data class from a list of sealed classes. For example, I have :

data class Payroll(
   val items: List<Inventory> 
)

sealed class Inventory {
  data class testOne(val amount: Int)
  data class testTwo(val isProd: Boolean)
}

I would like to return testTwo class so I can perform a check on isProd.

I tried:

payroll.items.find{ it is Inventory.testTwo}

it returns TestTwo but as an Inventory so I cannot access testTwo.isProd

CodePudding user response：

First of all, testOne and testTwo in your example do not subtype Inventory. I assume this is just a mistake when preparing the example for StackOverflow.

If you need to find the first testTwo item or null if there is none, you can do it like this:

payroll.items.firstNotNullOfOrNull { it as? Inventory.testTwo }

Or if you need to find all testTwo items:

payroll.items.filterIsInstance<Inventory.testTwo>()