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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.

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.sequences/map-indexed-not-null-to.html