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I want to load the paragraph id in theme preprocess.

function theme_preprocess_layout(&$variables) {
  $ID = $variables['content']['#paragraph'] ???; "contents - protected 'id' => array(1) = 68"
  $variables['attributes'] = new Drupal\Core\Template\Attribute($variables['attributes']);
  $variables['attributes']->addClass($ID);}

It gives me the available method "load($id)" but I don't know how to implement this method.

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Thanks to Beau for the help. The method is simply

$ID = $variables['content']['#paragraph']->id();

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