Can someone say me why my veriables (lat and lon) doesnt change?

    let lat;
    let lon;
    let fetchFunc =  async function () {
         let fetch_begin_for_LINK_API =  fetch(LINK_API+"&appid="+API_KEY);
         let result =  await fetch_begin_for_LINK_API.json();
         lat = result[0].lat;
         lon = result[0].lon;
        

}