public ComplexDataInterface::set($property_name, $value, $notify = TRUE)
Sets a property value.
$property_name: The name of the property to set; e.g., 'title' or 'name'.
$value: The value to set, or NULL to unset the property.
bool $notify: (optional) Whether to notify the parent object of the change. Defaults to TRUE. If the update stems from a parent object, set it to FALSE to avoid being notified again.
$this
\InvalidArgumentException If the specified property does not exist.
\Drupal\Core\TypedData\Exception\MissingDataException If the complex data structure is unset and no property can be set.
public function set($property_name, $value, $notify = TRUE);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!TypedData!ComplexDataInterface.php/function/ComplexDataInterface::set/8.1.x