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How to determine if an argument is sent to the JavaScript function?

To determine if an argument is sent to function, use “default” parameters.

Example

You can try to run the following to implement it

Live Demo

<!DOCTYPE html>
<html>
   <body>
      <script>
         function display(arg1 = 'Tutorials', arg2 = 'Learning') {
            document.write(arg1 + ' ' +arg2+"<br>");
         }
         display('Tutorials', 'Learning');
         display('Tutorials');
         display();
      </script>
   </body>
</html>