TypeOf-3

TypeOf will return undefined and will print true as comparing to undefined will return true.

<!DOCTYPE html>
<html>
<head>
    <title>Welcome to LearnKode - A code learning platform</title>    
</head>
<body>
     <script>
var obj = {};
var result = (typeof obj.propNotDeclared === 'undefined');
document.write(result);
    </script>
</body>
</html>

Output