javascript/Question32.html at master · AsadAliQuant/javascript · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Question 32</title>
</head>
<body>

    <h3 id="string"></h3>

    <script>

       text = '';

        var current_users = ['admin', 'BILL', 'mark', 'john', 'jenny', 'elon'];
        var new_users = ['tommy', 'ELON', 'JOHN']

        const lower_current_users = current_users.map(x => {
            return x.toLowerCase();
        });
        const lower_new_users = new_users.map(x => {
            return x.toLowerCase();
        });

        for(let i = 0; i < lower_current_users.length; i++){
            if(lower_new_users.includes(lower_current_users[i])){
                text = " \n " + text + `The username ${lower_current_users[i]} is already in use, please try again. <br>`;
            }

        }

        document.getElementById('string').innerHTML = text;

    </script>
</body>
</html>