JQuery event listener for all elements of a class

Question

I have this code here and I'm trying to read the ids of all the elements of the selected class, but the result is always undefined. Any suggestions?

$(".notification_new").click(() => {
    let id = $(this).attr('id');
    alert(id);
    $.post("/update.php", {
        reqType: "changeNotificationStatus",
        notifId: id,
        dataType: "json"
        }, response => {
            alert(response);
        )
    })
});