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filterNotNull

Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0)
fun <T : Any> Array<out T?>.filterNotNull(): List<T>
fun <T : Any> Iterable<T?>.filterNotNull(): List<T>

Returns a list containing all elements that are not null.

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val numbers: List<Int?> = listOf(1, 2, null, 4)
val nonNullNumbers = numbers.filterNotNull()

println(nonNullNumbers) // [1, 2, 4]
//sampleEnd
}

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/filter-not-null.html