void insertBefore(
E entry
)

Insert an element before this element in this element's linked list.

This entry must be in a linked list when this method is called. The entry must not be in a linked list.

Source

/**
 * Insert an element before this element in this element's linked list.
 *
 * This entry must be in a linked list when this method is called.
 * The [entry] must not be in a linked list.
 */
void insertBefore(E entry) {
  _list._insertAfter(_previous, entry);
}