Appends all objects of iterable
to the end of this list.
Extends the length of the list by the number of objects in iterable
.
Throws an UnsupportedError
if this list is fixed-length.
void addAll(Iterable<E> iterable) {
int len = _list.length;
_list.addAll(iterable);
_notifyChangeLength(len, _list.length);
int added = _list.length - len;
if (hasListObservers && added > 0) {
_recordChange(new ListChangeRecord(this, len, addedCount: added));
}
}