Google Maps API 'title' filter

Good evening,

I create bookmarks on the map using the method:

    function addMarkersLabel() {
        var latlngbounds = new google.maps.LatLngBounds();
        for (var i in points) {
            var marker = new MarkerWithLabel({
                position: points[i].latLng,
                title: points[i].titulo,
                icon: points[i].icone,
                zIndex: points.length - Number(i),
                map: GMaps,
                labelContent: points[i].labelContent,
                labelAnchor: points[i].labelAnchor,
                labelClass: points[i].labelClass
            });

            addMarkerListener(marker, points[i].id);
            markers.push(marker);
            latlngbounds.extend(marker.position);
        }
    }

But I need to allow after the map is created to show / hide the markers, using the title field of markers as a filter, if the title is equal to X, if not hidden.