Platform and version requirements: JVM (1.4), JS (1.4), Native (1.4)

inline fun <S : CharSequence> S.onEachIndexed(
    action: (index: Int, Char) -> Unit
): S

Performs the given action on each character, providing sequential index with the character, and returns the char sequence itself afterwards.

Parameters

action - function that takes the index of a character and the character itself and performs the action on the character.