filter

inline fun CharSequence.filter(predicate: (Char) -> Boolean): CharSequence

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

Samples

import samples.*
import java.util.Locale
import kotlin.test.*
fun main() { 
   //sampleStart 
   val text = "a1b2c3d4e5"

val textWithOnlyDigits = text.filter { it.isDigit() }

assertPrints(textWithOnlyDigits, "12345") 
   //sampleEnd
}

inline fun String.filter(predicate: (Char) -> Boolean): String

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

Samples

import samples.*
import java.util.Locale
import kotlin.test.*
fun main() { 
   //sampleStart 
   val text = "a1b2c3d4e5"

val textWithOnlyDigits = text.filter { it.isDigit() }

assertPrints(textWithOnlyDigits, "12345") 
   //sampleEnd
}