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Asked: 2026-05-18T00:13:37+00:00

All, Below is the code that I have written in JS. <html> <head> <title>Fibonacci

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All,

Below is the code that I have written in JS.

<html>
   <head>
      <title>Fibonacci trial</title>
   </head>
   <body>
      <script type="text/javascript">
            var strRepresen = new String();
            var numberReprsen = new Number();
            strRepresen = "XXX";
            numberReprsen = 10;
            strRepresen = 5;
            numberReprsen = "XXX again";
            document.write(strRepresen);
            document.write(numberReprsen);
      </script>
   </body>
</html>

I have following queries:

1 > I am not able to understand how the line numberReprsen = "XXX again"; does not give an error or NaN when I have defined numberReprsen as a Number object.
2 > I have seen many scripts not writing <script type = "text/javascript">. Is it a standard or mandate to mention the script type?

Note: I am a beginner in Javascript.

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1 Answer

  1. Editorial Team

    I am not able to understand how the line numberReprsen = "XXX again"; does not give an error or NaN when I have defined numberReprsen as a Number object.

    Variables in JavaScript are not typed. You have not defined numberReprsen as a Number variable. You have defined it as a variable. That it at one time happened to contain a Number object is irrelevant. You can store anything in it.

    I have seen many scripts not writing <script type = "text/javascript">. Is it a standard or mandate to mention the script type?

    I believe type is an attribute required by the more recent (X)HTML specifications. But yes, generally, it is a good idea to specify. I always do.

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