kotlin-stdlib / kotlin.collections / filterIsInstance

filterIsInstance

Common
JVM
JS
Native
1.0
fun <reified R> Array<*>.filterIsInstance(): List<R>
(source)
fun <reified R> Iterable<*>.filterIsInstance(): List<R>
(source)

Returns a list containing all elements that are instances of specified type parameter R.

import kotlin.test.*

fun main(args: Array<String>) {
//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 = animals.filterIsInstance<Cat>()

println(cats) // [Scratchy]
//sampleEnd
}
JVM
1.0
fun <R> Array<*>.filterIsInstance(klass: Class<R>): List<R>
(source)
fun <R> Iterable<*>.filterIsInstance(
    klass: Class<R>
): List<R>
(source)

Returns a list containing all elements that are instances of specified class.

import kotlin.test.*

fun main(args: Array<String>) {
//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 = animals.filterIsInstance(Cat::class.java)

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