reduceIndexed

inline fun <S, T : S> Array<out T>.reduceIndexed(
    operation: (index: Int, acc: S, T) -> S
): S
(source)
inline fun ByteArray.reduceIndexed(
    operation: (index: Int, acc: Byte, Byte) -> Byte
): Byte
(source)
inline fun ShortArray.reduceIndexed(
    operation: (index: Int, acc: Short, Short) -> Short
): Short
(source)
inline fun IntArray.reduceIndexed(
    operation: (index: Int, acc: Int, Int) -> Int
): Int
(source)
inline fun LongArray.reduceIndexed(
    operation: (index: Int, acc: Long, Long) -> Long
): Long
(source)
inline fun FloatArray.reduceIndexed(
    operation: (index: Int, acc: Float, Float) -> Float
): Float
(source)
inline fun DoubleArray.reduceIndexed(
    operation: (index: Int, acc: Double, Double) -> Double
): Double
(source)
inline fun BooleanArray.reduceIndexed(
    operation: (index: Int, acc: Boolean, Boolean) -> Boolean
): Boolean
(source)
inline fun CharArray.reduceIndexed(
    operation: (index: Int, acc: Char, Char) -> Char
): Char
(source)

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.

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

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.