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flatMapTo

Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0)
inline fun <R, C : MutableCollection<in R>> CharSequence.flatMapTo(
    destination: C, 
    transform: (Char) -> Iterable<R>
): C

Appends all elements yielded from results of transform function being invoked on each character of original char sequence, to the given destination.

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/flat-map-to.html