inline fun <T, R : Any, C : MutableCollection<in R>> Array<out T>.mapNotNullTo(
    destination: C, 
    transform: (T) -> R?
): C

Applies the given transform function to each element in the original array and appends only the non-null results to the given destination.

inline fun <T, R : Any, C : MutableCollection<in R>> Iterable<T>.mapNotNullTo(
    destination: C, 
    transform: (T) -> R?
): C

Applies the given transform function to each element in the original collection and appends only the non-null results to the given destination.

inline fun <K, V, R : Any, C : MutableCollection<in R>> Map<out K, V>.mapNotNullTo(
    destination: C, 
    transform: (Entry<K, V>) -> R?
): C

Applies the given transform function to each entry in the original map and appends only the non-null results to the given destination.