kotlin-stdlib/kotlin.text/filterIndexed

filterIndexed

inline fun CharSequence.filterIndexed(predicate: (index: Int, Char) -> Boolean): CharSequence(source)

Returns a char sequence containing only those characters from the original char sequence that match the given predicate.

Since Kotlin

1.0

Parameters

predicate

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

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
}
inline fun String.filterIndexed(predicate: (index: Int, Char) -> Boolean): String(source)

Returns a string containing only those characters from the original string that match the given predicate.

Since Kotlin

1.0

Parameters

predicate

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

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
}