abstract fun addAll(elements: Collection<E>): Boolean
Overrides MutableCollection.addAll
Adds all of the elements in the specified collection to this collection.
Return true if any of the specified elements was added to the collection, false if the collection was not modified.
© 2010–2018 JetBrains s.r.o.
Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-mutable-set/add-all.html