function createMap(divId) {
  const source = new OSM();
  const layer = new TileLayer({
    source: source
  });
  const map = new Map({
    layers: [layer],
    target: divId,
    view: new View({
      center: [0, 0],
      zoom: 2
    })
  });
  const zoomslider = new ZoomSlider();
  map.addControl(zoomslider);
  return map;
}
function createMap(divId) {
  const source = new OSM();
  const layer = new TileLayer({
    source: source
  });
  const map = new Map({
    layers: [layer],
    target: divId,
    view: new View({
      center: [0, 0],
      zoom: 2
    })
  });
  const zoomslider = new ZoomSlider();
  map.addControl(zoomslider);
  return map;
}
function createMap ( divId ) { const source = new OSM ( ) ; const layer = new TileLayer ( { source : source } ) ; const map = new Map ( { layers : [ layer ] , target : divId , view : new View ( { center : [ 0 , 0 ] , zoom : 2 } ) } ) ; const zoomslider = new ZoomSlider ( ) ; map . addControl ( zoomslider ) ; return map ; }
Helper method for map-creation.

@param {string} divId The id of the div for the map.
@return {Map} The map instance.
Helper method for map - creation .
Create a map