Converting lats and longs to centerpoint in ArcGIS API for JavaScript?

Question

I'm working on a angular 2 website using the Arcgis API 3.24. I'm fairly new to ESRI and I was wondering how I could convert a extent that has values of

spatialReference :
    {wkid: 4326}
    xmax:
        "-106.477219"
    xmin :
        "-106.728864"
    ymax:
        "35.190922"
    ymin:
        "35.014214"

to a centerpoint x and y that I could center my map on?

My code:

setSelectedItem(selItem: any) {
  const self = this;
  loadModules(['esri/geometry/Extent', 'esri/SpatialReference', 'esri/symbols/SimpleLineSymbol', 'esri/graphic']).then(([Extent, SpatialReference, SimpleLineSymbol, Graphic]) => {
    const extent = new Extent(selItem.extent[0], selItem.extent[1], selItem.extent[2], selItem.extent[3], new SpatialReference({wkid: 4326}));
    self.isDrawToolVisible = selItem.useExtent;
    self.selectedItem = selItem;
    const color: any = '#004065';
    const symbol = new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID, color, 4);
    self.extentLayer.clear();
    self.extentLayer.add(new Graphic(extent, symbol));
    if (self.cartMap.graphics) {
      self.cartMap.graphics.clear();
    }
    if (selItem.useExtent && selItem.clipGraphic) {
      self.cartMap.graphics.Add(selItem.clipGraphic);
    }


    self.downloadFinishedItems = self.cartService.getItemsFinishedDownload();
  });
}

UPDATE :

When I try to center the x and y return with NaN:

Answer 1

Create a new Extent object using your specified parameters. If you omit the Spatial Reference parameter it will default to wkid: 4326. Then call the extent's getCenter() method to return the center point. Then simply call the map's centerAt() method passing in the center point. Below is sample code for the 3.x JS API:

require(["esri/map", "esri/geometry/Extent"],
    function (Map, Extent) {
        var map = new Map("map", {
            basemap: "topo",
            center: [-106.45, 35.75],
            zoom: 13
        });            
        var extent = new Extent(-106.728864, 35.014214, -106.477219, 35.190922);
        var centerPoint = extent.getCenter();        
        map.centerAt(centerPoint);
   });