State servic eallow to store variables such as state of the server temporarily or permanently
Examples:
Read
A single value.$val = \Drupal::state()->get('key');
Multiple key/value pairs.$pairs = \Drupal::state()->getMultiple($keys);
Write
A single value.\Drupal::state()->set('key','value');
Multiple values.\Drupal::state()->setMultiple($keyvalues);
Remove\Drupal::state()->delete('key');
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More details : https://www.drupal.org/docs/8/api/state-api/overview
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