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What is an exclamation “!” operator in JavaScript?


The exclamation operator is to perform negation on an expression.

Example

You can try to run the following code to learn how to implement exclamation(!) operator in JavaScript −

<html>
   <head>
      <title>JavaScript Boolean</title>
   </head>

   <body>
      <script>
         var answer = true;
         document.write(answer);
         document.write("<br>"+!answer);
      </script>
   </body>
</html>