Openlayers 4 - Determine if layer is a layer group

Question

Is there a method or property in javascript using the Openlayers (3 or) 4 library which I can use to verify if a given layer is a layer group?

Answer 1

You can test your layer to see if it's an instance of a layer group:

if (myLayer instanceof ol.layer.Group) {
    alert("It's a group!");
}

Answer 2

Check out this leaflet plugin:

https://www.npmjs.com/package/leaflet.markercluster.layersupport

checkIn() methods may return added layer groups.