JS Data Types

<!DOCTYPE html>
<html>
<body style="font-family: sans-serif; padding: 20px;">
    <h2>Pemeriksaan Tipe Data (typeof)</h2>
    <pre id="hasilTypeof" style="background:#1e293b; color:#38bdf8; padding:15px; border-radius:8px;"></pre>

    <script>
        const teks = typeof "Halo";
        const angka = typeof 12345;
        const boolean = typeof true;
        const objek = typeof { id: 1 };
        const takTerdefinisi = typeof belumDiisi;

        document.getElementById('hasilTypeof').innerText = 
            'typeof "Halo"       -> ' + teks + '
' +
            'typeof 12345        -> ' + angka + '
' +
            'typeof true         -> ' + boolean + '
' +
            'typeof { id: 1 }    -> ' + objek + '
' +
            'typeof takTerdefinisi -> ' + takTerdefinisi;
    </script>
</body>
</html>