reduce
inline fun <S, T : S> MultiArray<T, D1>.reduceIndexed(operation: (index: Int, acc: S, T) -> S): S
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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 collection.
Parameters
operation
function that takes the index of an element, current accumulator value and the element itself and calculates the next accumulator value.