CodingWithTashi

floatingActionButton: FloatingActionButton(
        onPressed: counterProvider.update,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      )

CodingWithTashi

    CounterProvider counterProvider = Provider.of<CounterProvider>(context, listen: false); //make sure to put listent to false

CodingWithTashi

const Text(
              'You have pushed the button this many times:',
            ),
            Consumer<CounterProvider>(
              builder: (_, provider, __) {
                return Text(
                  '${provider.count}',
                  style: Theme.of(context).textTheme.headline4,
                );
              },

CodingWithTashi

 return ChangeNotifierProvider<CounterProvider>(
      create: (context) => CounterProvider(),
      child: MaterialApp(
        title: 'Flutter Demo',
        theme: ThemeData(
          primarySwatch: Colors.blue,
        ),
        home: const MyHomePage(title: 'Flutter Demo Home Page'),
      ),
    );

CodingWithTashi

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
///THIS CLASS IS WHERE STATE ARE BEING MANAGE,EVERYTIME WE CALL update(), IT WILL INFORM 
///TEXT WIDGET TO REBUILD
class CounterProvider extends ChangeNotifier {
  int count = 0;
  update() {
    count++;
    notifyListeners();
  }

CodingWithTashi

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

void main() {
  runApp(const MyApp());
}
class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {

CodingWithTashi

void main() {
 String? data;
 String newData = data!+"!!!";
}

CodingWithTashi

void main() {
 List<String>? firstList;
  List<String> secondList=['a','b','c'];
  List<String> finalList = [...?firstList,...secondList];
  print(finalList);
}

CodingWithTashi

void main() {
  String? temporaryValue;
  String newValue = temporaryValue??='Test';
  print(newValue);
}

CodingWithTashi

void main() {
  String? temporaryValue;
  //temporaryValue='Initial Temp Value';
  String newValue = temporaryValue??'Test';
  print(newValue);
}