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About sealed subclass of a sealed class in Kotlin


By : caroi
Date : August 29 2020, 02:00 PM
this one helps. Two left indented conditions are never satisfied because Color.Dark and Color.Lightdo not inherit Color, and not because they are abstract. It means that 2 out of 6 is branches are useless, you can safely delete them. But other 4 branches (is Color.Dark.DarkRed, etc.) go through all Color subclasses, and Color is a sealed class, so when can be used without else branch.
code :


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Reflection not extracting values from: Sealed Class having a property, which is object of another sealed class.


By : ventee khara
Date : March 29 2020, 07:55 AM
help you fix your problem I am recrusively evaluating properties via reflection using object.GetType().GetProperty(string propertyName). , Ah, the problem is simple: Prpty2 is not a property: it is a field:
code :
public NestedNestedClass Prpty2 = new NestedNestedClass();
private readonly NestedNestedClass prpty2 = new NestedNestedClass();
public NestedNestedClass Prpty2 { get { return prpty2; } }
object obj = new BaseClass();
obj = obj.GetType().GetProperty("Prpty1").GetValue(obj, null);
obj = obj.GetType().GetProperty("Prpty2").GetValue(obj, null);
obj = obj.GetType().GetProperty("Prpty3").GetValue(obj, null);
string s = obj.ToString(); // "Test value"

What is the specific difference between a sealed trait and an abstract sealed class in scala?


By : Mahendra
Date : March 29 2020, 07:55 AM
seems to work fine There is no difference in the meaning of sealed whether you put it on an (abstract) class or a trait. So in your case, the two examples are indeed (almost) equivalent.
A difference between an abstract class and a trait comes apparent when a subclass wants to inherit from another class: A class/trait can always only extend a single class, but multiple traits. For example:
code :
class SomeClass

sealed trait Beat1
abstract sealed class Beat2

case object Rest1 extends SomeClass with Beat1 // ok
case object Rest2 extends SomeClass with Beat2 // compile error

Difference between using sealed trait and sealed abstract class as a base class


By : Lorenzo Merici
Date : March 29 2020, 07:55 AM
it helps some times In this particular case there are no differences except that you can't extend multiple abstract classes but you can extend multiple traits.
You should check other answers (as mentioned in the comments) to see the actual differences between abstract classes and traits. If you are just going to use an abstract class or a trait to define the type hierarchy as in this case, then there are no differences.
code :
trait A
trait B

case class C(a: Int) extends A with B
abstract class A
abstract class B

case class C(a: Int) extends A with B

Kotlin sealed class subclass needs to be casted to base class if provided as RxJava Observable


By : yarod45
Date : March 29 2020, 07:55 AM
around this issue maybe you misunderstand the generic variance in kotlin. it works fine since Success is a subtype of Result. so the "No need cast" warning reported and the code below works fine:
code :
val ok:Success<Boolean>  = Success(true);
val result:Result<Boolean>  = ok;
val ok:Success<Boolean>  = Success(true);
val result1:Result<Any>  = ok;// error
val result2:Result<out Any>  = ok;// ok
fun getOrganization(): Observable<out Result<Boolean>> {
    return api.getOrganization("google")
            .map<Result<Boolean>> { Success(true) }
            .onErrorReturn { Failure(RuntimeException("throwable")) }
}

Kotlin sealed class - how to sort by sealed class similar to sorting by enum


By : user2167693
Date : March 29 2020, 07:55 AM
around this issue Maybe not completely what you are looking for, but maybe it is...
While the sealed classes don't seem to have something like an ordinal, which you've already noticed, there is sealedSubclasses on the class itself (i.e. GoodCountries::class.sealedSubclasses). Also, it seems as if the order of the sealedSubclasses is the one of the defined classes, i.e. Brazil in this list always comes first, USA second, etc. The order is different if they aren't all nested (i.e. if some are outside, they are listed first).
code :
val entityList = listOf(Germany(), China(), USA(), Brazil(), Germany())
entityList.sortedBy { // or use sortedWith(compareBy {
  GoodCountries::class.sealedSubclasses.indexOf(it::class)
}.forEach(::println) // or toList...
GoodCountries::class.sealedSubclasses
    .asSequence()
    .flatMap { klazzInOrder ->
      entityList.asSequence().filter { it::class == klazzInOrder }
    }
    .forEach(::println)
println("Listing the sealed classes in the order of their declaration*")
GoodCountries::class.sealedSubclasses.forEach(::println)

println("Listing the sealed classes ordered by their simple name")
GoodCountries::class.sealedSubclasses.sortedWith(compareBy(String.CASE_INSENSITIVE_ORDER) { it.simpleName!! })
  .forEach(::println)
// same result, but written differently
GoodCountries::class.sealedSubclasses.sortedBy { it.simpleName?.toLowerCase() }
  .forEach(::println)
GoodCountries::class.sealedSubclasses.sortedWith(compareBy(nullsLast(String.CASE_INSENSITIVE_ORDER)) { it.simpleName })
  .forEach(::println)
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