inline fun <T, R : Any, C : MutableCollection<in R>> Sequence<T>.mapNotNullTo( destination: C, transform: (T) -> R? ): C
Applies the given transform function to each element in the original sequence and appends only the non-null results to the given destination.
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.sequences/map-not-null-to.html