open fun addAll(elements: Collection<E>): Boolean

Platform and version requirements: JS

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.

open fun addAll(index: Int, elements: Collection<E>): Boolean

Platform and version requirements: JS

Inserts all of the elements in the specified collection elements into this list at the specified index.

Return true if the list was changed as the result of the operation.