filterIndexed

Common
JVM
JS
Native
1.0
fun < T > Sequence < T > . filterIndexed (
predicate : ( index : Int , T ) -> Boolean
) : Sequence < T >

(source)

Returns a sequence containing only elements matching the given predicate .

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val numbers: List<Int> = listOf(0, 1, 2, 3, 4, 8, 6)
val numbersOnSameIndexAsValue = numbers.filterIndexed { index, i -> index == i }

println(numbersOnSameIndexAsValue) // [0, 1, 2, 3, 4, 6]
//sampleEnd
}

Parameters

predicate -

function that takes the index of an element and the element itself and returns the result of predicate evaluation on the element.

The operation is intermediate and stateless .