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

Last update on December 16 2024 12:31:53 (UTC/GMT +8 hours)

JavaScript validation: Exercise-1 with Solution

Validate Boolean

Write a JavaScript function to validate whether a given value type is Boolean 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 boolean or not.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function is_boolean(value)
        {
        return value === true || value === false || toString.call(value) === '[object Boolean]';
       }

console.log(is_boolean(true));

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

Sample Output:

true
false

Flowchart:

Live Demo:

See the Pen javascript-validation-exercise-1 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus

Previous: JavaScript validation.
Next: Write a JavaScript function to validate whether a given value type is error or not.