JavaScript Program to Count Vowels in a Given String

JavaScript Program to Count Vowels in a Given String

Write a JavaScript program to count the number of vowels in a given string.



Source Code
<html>
<head>
    <title>Count vowels in a string</title>
</head>
<body>
    <script>
        var str = prompt('Enter the string', '')
        var vowels = countVowels(str)
        document.write("Given string: " + str)
        document.write("<br>Number of Vowels: " + vowels)

        function countVowels(s)
        {
            var i=0, count=0
            var ch
            for(var i=0; i<s.length; i++)
            {
                ch = s.charAt(i)
                if(ch == 'a' || ch == 'A' || ch == 'e' || ch == 'E' || ch == 'i' || 
                    ch == 'I' || ch == 'o' || ch == 'O' || ch == 'u' || ch == 'U')
                {
                    count++
                }
            }
            return count;
        }
    </script>
</body>
</html>
Output