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.
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 a character and the character itself
and returns the result of predicate evaluation on the character.
Returns a string containing only those characters from the original string that match 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 a character and the character itself
and returns the result of predicate evaluation on the character.