inline fun <R : Any> CharSequence.mapNotNull( transform: (Char) -> R? ): List<R>
Returns a list containing only the non-null results of applying the given transform function to each character in the original char sequence.
import kotlin.test.*
fun main(args: Array<String>) {
//sampleStart
val strings: List<String> = listOf("12a", "45", "", "3")
val ints: List<Int> = strings.mapNotNull { it.toIntOrNull() }
println(ints) // [45, 3]
println(ints.sum()) // 48
//sampleEnd
}
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/map-not-null.html