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  @override
  void dispose() {
    super.dispose();
    nameController.dispose();
    emailController.dispose();
    passwordController.dispose();
    ageController.dispose();
  }

PeterHdd

return Scaffold(
appBar: AppBar(
    title: Text(title),
    actions: <Widget>[
    IconButton(
        icon: Icon(
        Icons.exit_to_app,
        color: Colors.white,
        ),
        onPressed: () {

PeterHdd

return Drawer(
child: ListView(
    padding: EdgeInsets.zero,
    children: <Widget>[
    UserAccountsDrawerHeader(
        accountEmail: Text(name),
        accountName: Text(email),
        decoration: BoxDecoration(
        color: Colors.blue,
        ),

PeterHdd

void logInToFb() {
firebaseAuth
    .signInWithEmailAndPassword(
        email: emailController.text, password: passwordController.text)
    .then((result) {
    Navigator.pushReplacement(
    context,
    MaterialPageRoute(builder: (context) => Home(uid: result.user.uid)),
    );
}).catchError((err) {

PeterHdd

// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override

PeterHdd

final firestoreInstance = FirebaseFirestore.instance;

PeterHdd

  void _onPressed() {
  firestoreInstance.collection("users").add(
  {
    "name" : "john",
    "age" : 50,
    "email" : "example@example.com",
    "address" : {
      "street" : "street 24",
      "city" : "new york"
    }

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void _onPressed(){
  var firebaseUser =  FirebaseAuth.instance.currentUser;
  firestoreInstance.collection("users").doc(firebaseUser.uid).set(
  {
    "name" : "john",
    "age" : 50,
    "email" : "example@example.com",
    "address" : {
      "street" : "street 24",
      "city" : "new york"

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void _onPressed() {
  var firebaseUser =  FirebaseAuth.instance.currentUser;
  firestoreInstance.collection("users").doc(firebaseUser.uid).set(
  {
   "username" : "userX",
  },SetOptions(merge: true)).then((_){
      print("success!");
  });
}

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void _onPressed()async{
    var firebaseUser = await FirebaseAuth.instance.currentUser();
    firestoreInstance
        .collection("users")
        .document(firebaseUser.uid)
        .updateData({"age": 60}).then((_) {
      print("success!");
    });
}