wp_nav_menu change sub-menu class name?

Question

Is there a way to change the child

generated by WordPress itself to a custom class name?

I know the parent

Answer 1

You don't need to extend the Walker. This will do:

function overrideSubmenuClasses( $classes ) {
    $classes[] = 'myclass1';
    $classes[] = 'myclass2';

    return $classes;
}
add_action('nav_menu_submenu_css_class', 'overrideSubmenuClasses');