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foldIndexed

inline fun <T, R> Sequence<T>.foldIndexed(
    initial: R, 
    operation: (index: Int, acc: R, T) -> R
): R

Accumulates value starting with initial value and applying operation from left to right to current accumulator value and each element with its index in the original sequence.

Parameters

operation - function that takes the index of an element, current accumulator value and the element itself, and calculates the next accumulator value.

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.sequences/fold-indexed.html