kotlin-stdlib/kotlin.sequences/filterIndexed

filterIndexed

fun <T> Sequence<T>.filterIndexed(predicate: (index: Int, T) -> Boolean): Sequence<T>(source)

Returns a sequence containing only elements matching the given predicate.

Since Kotlin

1.0

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.

Samples

import kotlin.test.*

fun main() { 
   //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
}