JavaScript: Validate whether a given value type is NaN or not

Last update on August 19 2022 21:51:52 (UTC/GMT +8 hours)

JavaScript validation: Exercise-3 with Solution

Write a JavaScript function to validate whether a given value type is NaN or not.

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript function to validate whether a given value type is NaN or not</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function is_nan(val)
        {
        return val !== val;
       }

console.log(is_nan(NaN));

console.log(is_nan('bar'));

Sample Output:

true
false

Flowchart:

Live Demo:

See the Pen javascript-validation-exercise-3 by w3resource (@w3resource) on CodePen.

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