addAll
open fun addAll(elements: Collection<E>): BooleanAdds all of the elements of 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.
open fun addAll(elements: Collection<E>): BooleanAdds all of the elements of 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.