kotlin-stdlib/kotlin.collections/filterIsInstanceTo

filterIsInstanceTo

inline fun <R, C : MutableCollection<in R>> Array<*>.filterIsInstanceTo(destination: C): C(source)
inline fun <R, C : MutableCollection<in R>> Iterable<*>.filterIsInstanceTo(destination: C): C(source)

Appends all elements that are instances of specified type parameter R to the given destination.

Since Kotlin

1.0

Samples

import kotlin.test.*

fun main() { 
   //sampleStart 
   open class Animal(val name: String) {
    override fun toString(): String {
        return name
    }
}
class Dog(name: String): Animal(name)
class Cat(name: String): Animal(name)

val animals: List<Animal> = listOf(Cat("Scratchy"), Dog("Poochie"))
val cats = mutableListOf<Cat>()

println(cats) // []

animals.filterIsInstanceTo<Cat, MutableList<Cat>>(cats)

println(cats) // [Scratchy] 
   //sampleEnd
}
fun <C : MutableCollection<in R>, R> Array<*>.filterIsInstanceTo(destination: C, klass: Class<R>): C(source)
fun <C : MutableCollection<in R>, R> Iterable<*>.filterIsInstanceTo(destination: C, klass: Class<R>): C(source)

Appends all elements that are instances of specified class to the given destination.

Since Kotlin

1.0

Samples

import kotlin.test.*

fun main() { 
   //sampleStart 
   open class Animal(val name: String) {
    override fun toString(): String {
        return name
    }
}
class Dog(name: String): Animal(name)
class Cat(name: String): Animal(name)

val animals: List<Animal> = listOf(Cat("Scratchy"), Dog("Poochie"))
val cats = mutableListOf<Cat>()

println(cats) // []

animals.filterIsInstanceTo(cats, Cat::class.java)

println(cats) // [Scratchy] 
   //sampleEnd
}