【Laravel】How to pass laravel variable to javascript in blade file

Say I passed $param to sample.blade.php in Controller

(SampleController.php)
public function index(Request $request){
      return view('contents.sample')->with('param' => ['one', 'two', 'three']);
}

Then in the blade file, all you have to do is just pass $param to js like this

(sample.blade.php)
<script type="text/javascript">
    	var param = @json($param);
    	alert(param);
</script>