inline fun CharSequence.filterIndexed( predicate: (index: Int, Char) -> Boolean ): CharSequence
Returns a char sequence containing only those characters from the original char sequence that match the given predicate.
predicate - function that takes the index of a character and the character itself and returns the result of predicate evaluation on the character.
inline fun String.filterIndexed( predicate: (index: Int, Char) -> Boolean ): String
Returns a string containing only those characters from the original string that match the given predicate.
predicate - function that takes the index of a character and the character itself and returns the result of predicate evaluation on the character.
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/filter-indexed.html