filter
Returns a char sequence containing only those characters from the original char sequence that match the given predicate.
import java.util.Locale
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
val text = "a1b2c3d4e5"
val textWithOnlyDigits = text.filter { it.isDigit() }
println(textWithOnlyDigits) // 12345
//sampleEnd
}
Returns a string containing only those characters from the original string that match the given predicate.
import java.util.Locale
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
val text = "a1b2c3d4e5"
val textWithOnlyDigits = text.filter { it.isDigit() }
println(textWithOnlyDigits) // 12345
//sampleEnd
}