reduceIndexed

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

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

val text = "kotlin" val maxChar = text.reduceIndexed { index, acc, c -> if (c > acc) c else acc } println("Maximum character: $maxChar")

Source