map Not Null
inline fun <R : Any> CharSequence.mapNotNull(transform: (Char) -> R?): List<R>
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Returns a list containing only the non-null results of applying the given transform function to each character in the original char sequence.
Samples
import samples.*
import kotlin.test.*
fun main() {
//sampleStart
val strings: List<String> = listOf("12a", "45", "", "3")
val ints: List<Int> = strings.mapNotNull { it.toIntOrNull() }
assertPrints(ints, "[45, 3]")
assertPrints(ints.sum(), "48")
//sampleEnd
}