addAllElements method
Adds all the entries in elements to this instances.
Implementation
void addAllElements(Iterable<E> elements) {
  for (var e in elements) {
    addElement(e);
  }
}Adds all the entries in elements to this instances.
void addAllElements(Iterable<E> elements) {
  for (var e in elements) {
    addElement(e);
  }
}