inline fun <S, T : S> Iterable<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 collection.

Parameters

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

inline fun <S, T : S> Array<out T>.reduceIndexed(
    operation: (index: Int, acc: S, T) -> S
): S

inline fun ByteArray.reduceIndexed(
    operation: (index: Int, acc: Byte, Byte) -> Byte
): Byte

inline fun ShortArray.reduceIndexed(
    operation: (index: Int, acc: Short, Short) -> Short
): Short

inline fun IntArray.reduceIndexed(
    operation: (index: Int, acc: Int, Int) -> Int
): Int

inline fun LongArray.reduceIndexed(
    operation: (index: Int, acc: Long, Long) -> Long
): Long

inline fun FloatArray.reduceIndexed(
    operation: (index: Int, acc: Float, Float) -> Float
): Float

inline fun DoubleArray.reduceIndexed(
    operation: (index: Int, acc: Double, Double) -> Double
): Double

inline fun BooleanArray.reduceIndexed(
    operation: (index: Int, acc: Boolean, Boolean) -> Boolean
): Boolean

inline fun CharArray.reduceIndexed(
    operation: (index: Int, acc: Char, Char) -> Char
): Char

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.

Parameters

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