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