inline fun <T, R : Any> Array<out T>.mapIndexedNotNull( transform: (index: Int, T) -> R? ): List<R>
Returns a list containing only the non-null results of applying the given transform function to each element and its index in the original array.
transform - function that takes the index of an element and the element itself and returns the result of the transform applied to the element.
inline fun <T, R : Any> Iterable<T>.mapIndexedNotNull( transform: (index: Int, T) -> R? ): List<R>
Returns a list containing only the non-null results of applying the given transform function to each element and its index in the original collection.
transform - function that takes the index of an element and the element itself and returns the result of the transform applied to the element.
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/map-indexed-not-null.html