kotlin-stdlib/kotlin.text/filterIndexedTo

filterIndexedTo

inline fun <C : Appendable> CharSequence.filterIndexedTo(destination: C, predicate: (index: Int, Char) -> Boolean): C

Appends all characters matching the given predicate to the given destination.

Samples

import samples.*
import kotlin.test.*
fun main() { 
   //sampleStart 
   val numbers: List<Int> = listOf(0, 1, 2, 3, 4, 8, 6)
val numbersOnSameIndexAsValue = mutableListOf<Int>()

assertPrints(numbersOnSameIndexAsValue, "[]")

numbers.filterIndexedTo(numbersOnSameIndexAsValue) { index, i -> index == i }

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

Parameters

predicate

function that takes the index of a character and the character itself and returns the result of predicate evaluation on the character.