Why is it not possible to add multiple collections to ymaps.GeoObjectCollection?

Question

JavaScript

There is a problem: only the last recorded collection is shown on the map.

ymaps.ready(init);
        var myMap;
        function init() {
            myMap = new ymaps.Map("map", {
                center: [53.901, 27.5601],
                zoom: 11,
                behaviors: ['default', 'scrollZoom']
            });
            myMap.controls.add('typeSelector');
            myMap.controls.add('zoomControl');
            myMap.controls.add('searchControl');
            var geoObjects = new ymaps.GeoObjectCollection();
            geoObjects.add(GetMetalPoints());
            geoObjects.add(GetLightPoints());
            myMap.geoObjects.add(geoObjects);
        }

GetMetalPoints() and GetLightPoints() return GeoObjectCollections;
Only the latest added collection is shown on the map. If you comment out geoObjects.add(GetLightPoints()), then GetMetalPoints() will be displayed.

Answer 1

Hello!
just try

...
myMap.controls.add('typeSelector');
myMap.controls.add('zoomControl');
myMap.controls.add('searchControl');
myMap.geoObjects.add(GetMetalPoints());
myMap.geoObjects.add(GetLightPoints());
...

But I would also like to look at the implementation of GetMetalPoints() and GetLightPoints() .. it seems that you use the same global variable in them to store a collection of geo objects.