public ListInterface::appendItem($value = NULL)
Appends a new item to the list.
mixed $value: The value of the new item.
\Drupal\Core\TypedData\TypedDataInterface The item that was appended.
public function appendItem($value = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!TypedData!ListInterface.php/function/ListInterface::appendItem/8.1.x