taxonomy query drupal 8 code example

Example 1: taxonomy_get_children drupal 8

$children = \Drupal::entityTypeManager()->getStorage('taxonomy_term')->loadChildren($entity->id());

Example 2: taxonomy_get_parents drupal 8

$storage = \Drupal::service('entity_type.manager')->getStorage('taxonomy_term');

$parents = $storage ->loadParents($term->id());