Javascript - Capitalize string

Here is a simple JavaScript function to capitalize a string. Please note that strings are immutable. That is why I have to concatenate the first character with the rest of the string to form the result.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Javascript - Capitalize</title>
    <script>
 
        function capitalize(str) {
            firstChar = str.charAt(0).toUpperCase();
            result = firstChar + str.substring(1);
            return result;
        }
 
        input="test";
        alert( capitalize(input) );
    </script>
</head>
<body>
 
</body>
</html>

Output

It is will pop up an alert with the string Test.

Javascript

About the author

Xuan Ngo is the founder of OpenWritings.net. He currently lives in Montreal, Canada. He loves to write about programming and open source subjects.