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How to pass-by-value in Kotlin?


By : Sayi
Date : September 16 2020, 04:00 PM
This might help you you can use the copy() method.
in your code it would be something like this
code :
changeAge(p.copy(age=99))


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How to pass kotlin class or kotlin class instance as arguments


By : peter wei
Date : March 29 2020, 07:55 AM
hope this fix your issue You can make use of reified type parameters like so:
code :
class Ex() {
    inline fun <reified T> m() {
        println(T::class)
    }
}

class Ex2() {
    fun m2() {
        Ex().m<Ex2>()
    }
}

Kotlin cannot access kotlin.jvm.functions.Function1 when calling kotlin function with java lambda


By : Lost_in_bits
Date : March 29 2020, 07:55 AM
it fixes the issue My problem got fixed when I configured Kotlin compiler and runtime for my Java module with the latest stable version (currently 1.3.30)
Just go to Tools > Kotlin > Configure Kotlin in Project > Android with Gradle and choose your Java module with Single module radio button selected then select your version and OK.

Kotlin: How to work with List casts: Unchecked Cast: kotlin.collections.List<Kotlin.Any?> to kotlin.colletions.Lis


By : prakash surana
Date : March 29 2020, 07:55 AM
wish of those help In Kotlin, there's no way to check the generic parameters at runtime in general case (like just checking the items of a List, which is only a special case), so casting a generic type to another with different generic parameters will raise a warning unless the cast lies within variance bounds.
There are different solutions, however:
code :
@Suppress("UNCHECKED_CAST")
val waypointList = list as? List<Waypoint> ?: return null
val waypointList: List<Waypoint> = list.filterIsInstance<Waypoint>()

if (waypointList.size != list.size)
    return null
val waypointList = list.filterIsInstance<Waypoint>()
    .apply { if (size != list.size) return null }
@Suppress("UNCHECKED_CAST")
inline fun <reified T : Any> List<*>.checkItemsAre() =
        if (all { it is T })
            this as List<T>
        else null
val waypointList = list.checkItemsAre<Waypoint>() ?: return null

kotlin.TypeCastException: null cannot be cast to non-null type kotlin.collections.Map<kotlin.String, kotlin.Any>


By : user1761044
Date : March 29 2020, 07:55 AM
like below fixes the issue With the line val user = AppUser(task.result.data as Map), make the Any variable nullable:
code :
val user = AppUser(task.result.data as Map<String, Any?>)

Unable to pass swift implementation of kotlin interface to kotlin native


By : swaldie
Date : March 29 2020, 07:55 AM
it helps some times The problem here is the result of trying to mutate Kotlin's singleton.
In Kotlin/Native, there are strict immutability rules, and one of them states that every object is mutable XOR shared. To achieve this, for singleton objects and enums are "frozen" by default - this means every attempt to mutate them will finish with InvalidMutabilityException, as you got. To avoid this, one got to make sure that object is thread-local and will never be mutated from another thread.
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