inline fun <C : Appendable> CharSequence.filterIndexedTo( destination: C, predicate: (index: Int, Char) -> Boolean ): C
Appends all characters matching the given predicate to the given destination.
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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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/filter-indexed-to.html