reduceRightIndexed

inline fun CharSequence.reduceRightIndexed(
    operation: (index: Int, Char, acc: Char) -> Char
): Char
(source)

Accumulates value starting with last character and applying operation from right to left to each character with its index in the original char sequence and current accumulator value.

Parameters

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