Conditionally Remove a nav menu link if session is active

you can write like below for WordPress :

<?php
if ( !is_user_logged_in() ) { ?>
    <ul>
        <li><a href="https://wordpress.stackexchange.com/questions/264407/login">Login</a></li>
        <li><a href="register">Register</a></li>
    </ul>
<?php }