What is the best way to do optional function parameters in JavaScript?

To include optional function parameters in JavaScript, you can try the following,

function myFunc(a, b = 0) {
   // function body
}

Example

You can try to run the following code to learn how to include optional function parameters −

<html>
   <body>
      <script>
         // default is set to 1
         function inc(val1, inc = 1) {
            return val1 + inc;
         }
         
         document.write(inc(10,10));
         document.write("<br>");
         document.write(inc(10));
      </script>
   </body>
</html>

Updated on: 23-Jun-2020

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