mapIndexedNotNullTo

inline fun <T, R : Any, C : MutableCollection<in R>> Sequence<T>.mapIndexedNotNullTo(
    destination: C, 
    transform: (index: Int, T) -> R?
): C

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

Parameters

transform - function that takes the index of an element and the element itself and returns the result of the transform applied to the element.