Kotlin
Kotlin
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kotlin.sequences.reduceIndexed

reduceIndexed

kotlin-stdlib / kotlin-sequences - reduceIndexed 
inline fun <S, T : S> Sequence<T>.reduceIndexed(
    operation: (index: Int, acc: S, T) -> S
): S

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

Parameters

operation - function