// markers saved here
var currentMarkers=[];

// tmp marker
var oneMarker= new mapboxgl.Marker(currentMarkerDiv)
    .setLngLat(marker.geometry.coordinates)
    .addTo(mapboxMap);

// save tmp marker into currentMarkers
currentMarkers.push(oneMarker);


// remove markers 
if (currentMarkers!==null) {
    for (var i = currentMarkers.length - 1; i >= 0; i--) {
      currentMarkers[i].remove();
    }
}