public TraversableTypedDataInterface::onChange($name)
React to changes to a child property or item.
Note that this is invoked after any changes have been applied.
$name: The name of the property or the delta of the list item which is changed.
public function onChange($name);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!TypedData!TraversableTypedDataInterface.php/function/TraversableTypedDataInterface::onChange/8.1.x