kotlin.collections.mapNotNull

inline fun <T, R : Any> Iterable<T>.mapNotNull(
    transform: (T) -> R?
): List<R>

Returns a list containing only the non-null results of applying the given transform function to each element in the original collection.

inline fun <K, V, R : Any> Map<out K, V>.mapNotNull(
    transform: (Entry<K, V>) -> R?
): List<R>

Returns a list containing only the non-null results of applying the given transform function to each entry in the original map.

inline fun <T, R : Any> Array<out T>.mapNotNull(
    transform: (T) -> R?
): List<R>

Returns a list containing only the non-null results of applying the given transform function to each element in the original array.