Why is using the JavaScript eval() function a bad idea?

The JavaScript eval() is used to execute an argument. The code gets execute slower when the eval() method is used. It also has security implementations since it has a different scope of execution.

Example

Here’s how you can implement eval() function −

<html>
   <body>
      <script>
          var a = 30;
         var b = 12;
         var res1 = eval("a * b") + "<br>";
         var res2 = eval("5 + 10") + "<br>";
         document.write(res1);
         document.write(res2);
      </script>
   </body>
</html>
Updated on: 2020-06-13T06:47:34+05:30

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