How to get field settings in Drupal 8

To get settings of an Entity field in Drupal 8

Use this code:

$entity_type='node';
$bundle='article';
$field_name='field_summary_image';
$bundle_fields = \Drupal::getContainer()->get('entity_field.manager')->getFieldDefinitions($entity_type, $bundle);
$field_definition = $bundle_fields[$field_name];
$file_directory= $field_definition->getSetting('file_directory');

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Use Case Diagram for Online Book Store

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