Mapbox-creation-api-layerGroup

Mapbox-creation-api-layerGroup.js

// create a LayerGroup object for collecting markers
var markersLayerGroup = L.layerGroup();

// add some markers to the collection
markersLayerGroup.addLayer(marker1);
markersLayerGroup.addLayer(marker2);

// add the collection of markers LayerGroup to the map.
markersLayerGroup.addTo(map);
// or
map.addLayer(markersLayerGroup);

// Note that when we are creating a LayerGroup object, we don't have the option to set its 
// visibility on the map, like it does in EntityCollection creation API in Bing map. We make the
// LayerGroup object visible when we add it to the map, and make it invisible when we remove
// it from the map.