mapIndexedNotNull

inline fun <R : Any> CharSequence.mapIndexedNotNull(
    transform: (index: Int, Char) -> R?
): List<R>
(source)

Returns a list containing only the non-null results of applying the given transform function to each character and its index in the original char sequence.

Parameters

transform - function that takes the index of a character and the character itself and returns the result of the transform applied to the character.