reduceIndexed
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 array.
inline fun <S, T : S> Array<out T>.reduceIndexed(operation: (index: Int, acc: S, T) -> S): S(source)
fun main() {
val numbers = arrayOf(2, 3, 4, 5)
// Sum each element multiplied by its index
val result = numbers.reduceIndexed { index, acc, value ->
acc + index * value
}
println("Result: $result") // Output: Result: 26
}