inline fun <T, R, C : MutableCollection<in R>> Sequence<T>.mapIndexedTo( 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 the results to the given destination.
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.sequences/map-indexed-to.html