public ListInterface::get($index)
Returns the item at the specified position in this list.
int $index: Index of the item to return.
\Drupal\Core\TypedData\TypedDataInterface|null The item at the specified position in this list, or NULL if no item exists at that position.
\Drupal\Core\TypedData\Exception\MissingDataException If the complex data structure is unset and no item can be created.
public function get($index);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!TypedData!ListInterface.php/function/ListInterface::get/8.1.x