How to use drupal behaviors on drupal 8?

What is drupal behaviors ?
Drupal behaviors allow to execute javascpts in particular context and / or pass data from drupal to client side java script.

/** 
* Implements hook_js_settings_alter(). 
* @inheritdoc 
*/ 

function custom_module_js_settings_alter(array &$settings, 
\Drupal\Core\Asset\AttachedAssetsInterface $assets) {

 $settings['custom_module']['text'] = "The text";
 
}

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