gistfile1.txt

//If functional component, const [cityData, setCityData] = useState[]

//Firebase, Getting a single document
var docRef = db.collection("cities").doc("SF");

docRef.get().then((doc) => {
    if (doc.exists) {
        console.log("Document data:", doc.data());
        this.setState({cityData: doc.data()}); //OR(if functional component)  setCityData(doc.data());
    } else {
        // doc.data() will be undefined in this case
        console.log("No such document!");
    }
}).catch((error) => {
    console.log("Error getting document:", error);
});


...


return(
...
<h1>{this.state.cityData.[node] //OR cityData