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mapNotNull

inline fun <R : Any> CharSequence.mapNotNull(
    transform: (Char) -> R?
): List<R>

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

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/map-not-null.html