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

Last update on March 06 2025 11:07:23 (UTC/GMT +8 hours)

JavaScript validation: Exercise-9 with Solution

Validate Char

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

</body>
</html>

JavaScript Code:

function is_char(value)
    {
      if (Object.prototype.toString.call(value) !== '[object String]')
        return false;
    return value && value.length === 1;
    }
 
console.log(is_char('f'));
console.log(is_char('*'));

Sample Output:

true
true

Flowchart:

Live Demo:

See the Pen javascript-validation-exercise-9 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

Write a JavaScript function that checks if a given input is a single character string.
Write a JavaScript function that validates whether the length of the input string is exactly one and returns true if so.
Write a JavaScript function that distinguishes between a character and an empty string or multi-character string.
Write a JavaScript function that returns a descriptive error if the input is not a string or its length is not equal to one.

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