api-docs / org.ktorm.entity / reduceIndexedOrNull

reduceIndexedOrNull

inline fun <E : Any> EntitySequence<E, *>.reduceIndexedOrNull(
    operation: (index: Int, acc: E, E) -> E
): E?

(source code)

Accumulate 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.

Returns null if the sequence is empty.

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

The operation is terminal.

Since
3.1.0