questionmark_object.html

<!DOCTYPE html>
<html>
<body>

<h2>JavaScript Variable with Question Mark</h2>
<p>Open console to check</p>
<script>
    let obj = {
        department: 'IT',
        // students: [
        //     {
        //         name: 'Student 1',
        //         roll: 1
        //     },
        //     {
        //         name: 'Student 2',
        //         roll: 2
        //     },
        //     {
        //         name: 'Student 3',
        //         roll: 3
        //     }
        // ]
    };
    
    //get the student roll of 'Student 2'
    let studentInfo = obj?.students?.find(student => student.name === 'Student 1');
    console.log('studentInfo => ', studentInfo);
</script>
</body>
</html> 