Request a Drupal 8 node NID on page load

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This function does exactly what it says, it returns the current Drupal 8 node NID that is being requested by the user. Be careful where you call it if the page is not a node it can break the website.

/**
 * @return string
 */
function _access_node_id() {
  $node = \Drupal::routeMatch()->getParameter('node');
  return $node->id();
}