Using gmaps.markerFilter

gistfile1.js

GMaps.prototype.markerFilter = function(conditions) {
  var filtered_markers = [], i = 0, detail, marker;

  for (i = 0; i < this.markers.length; i++) {
    marker = this.markers[i];

    if (conditions instanceof Array) {
      if (conditions.indexOf(marker.detail.id) > -1) {
        filtered_markers.push(marker);
      }
    }

    else if (conditions instanceof Function) {
      if (conditions.call(marker.detail) === true) {
        filtered_markers.push(marker);
      }
    }

    else if (conditions instanceof Object) {
      for (var c in conditions) {
        if (marker.detail[c] == conditions[c]) {
          filtered_markers.push(marker);
          break;
        }
      }
    }
  }

  return filtered_markers;
};

// Example

/*
  var map = new GMaps({lat: ...});
  
  map.addMarker({
    lat: -7,
    lng: -12,
    detail: {
      id: 10
    }
  });
  map.addMarker({
    lat: -7,
    lng: -13,
    detail: {
      id: 21,
      user_id: 616
    }
  });
  ...
*/

// Filtering with array
map.markerFilter([10, 35, 742]);
// => Array of markers which id (defined in detail) are included in [10, 35, 742]

// Filtering with function
map.markerFilter(function(detail) {
  return detail.user_id == 616 && detail.id >= 21;
});
// => Array of markers for which the function returns a true value

// Filtering with object
map.markerFilter({
  user_id: 616
});
// => Array of markers for which their attributes are the same as { user_id: 616 }

how i can set visible on the map only the markers returned in filtered_markers?