Variable undefined error in laravel blade view

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Two steps :

  1. Declare & transfer $variable to View from Controller function.

     public function index()
 {
  return view("index", [ "variable" => $variable ]);
 }

  2. Indicate where transferred $variable from Controller appear in view.blade.php.

     {{ $variable }}

If you do not make sure, $variable is transferred or not

{{ isset($variable) ? $variable : '' }}

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