web-development-tutorials/tut50.html at master · chinmay021/web-development-tutorials · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>JavaScript String Functions</title>
    <style>

    </style>
</head>

<body>
    <script>
        var str = 'This is a string';
        console.log(str);
        // first occurence of a substring
        var position = str.indexOf('is');
        position = str.lastIndexOf('is');
        console.log(position);

        // Substring from a string
        // var substr = str.slice(1,7); //  index 1 to 7
        // var substr = str.substring(1,7);//index 1 to 7
        var substr1 = str.substr(1, 3); //from 1 to length 3
        console.log(substr1)

        // var replaced = str.replace('string', 'Harry');
        // console.log(str)
        // console.log(replaced)

        // console.log(str.toUpperCase());
        // console.log(str.toLowerCase());
        // var newString = str.concat('New String')
        // console.log(newString)
        // var strWithWhitespaces = "   this contains        whitespaces   ";
        // console.log(strWithWhitespaces)
        // console.log(strWithWhitespaces.trim())

        // var char2 = str.charAt(2);
        // var char2 = str.charCodeAt(2); // Not very important
        // console.log(char2)

        console.log(str[3])
    </script>
</body>

</html>