function scrollMessagesDown(height = 0) {
        var scrollTo = height || $messenger.prop('scrollHeight');

        $messenger.scrollTop(scrollTo);
    }
/**
     * Scroll messages down to some height or bottom.
     */
Scroll messages down to some height or bottom.
Scroll messages down to some height or bottom .
function scrollMessagesDown(height = 0) {
        var scrollTo = height || $messenger.prop('scrollHeight');
        $messenger.scrollTop(scrollTo);
    }
function scrollMessagesDown ( height = 0 ) { var scrollTo = height || $messenger . prop ( 'scrollHeight' ) ; $messenger . scrollTop ( scrollTo ) ; }
Scroll messages down to some height or bottom.
Scroll messages down to some height or bottom .