AseemWangoo

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

import 'package:url_launcher/link.dart';

// Link

class LinkerDemo extends StatelessWidget {
  const LinkerDemo({Key key}) : super(key: key);

AseemWangoo

class Person extends ChangeNotifier {
  Person({this.name, this.age});
  final String name;
  int age;
         
  void increaseAge() {
    this.age++;
    notifyListeners();
  }
}

AseemWangoo

class HomeRepositoryImpl extends HomeRepository {
  @override
  Future<CarouselModel> fetchData() async {
    await Future.delayed(const Duration(milliseconds: 1800));
    final resp = await rootBundle.loadString('assets/data/first_screen.json');
    return carouselModelFromJson(resp);
  }
}

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abstract class PackageInfoService {
  Future<String> appVersion();
}
class PackageInfoServiceImpl implements PackageInfoService {
  @override
  Future<String> appVersion() async {
    final packageInfo = await PackageInfo.fromPlatform();
    String version = packageInfo.version;
    String build = packageInfo.buildNumber;
    return 'v$version ($build)';

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late HomeViewModel viewModel;
@override
void initState() {
  viewModel = Provider.of<HomeViewModel>(context, listen: false);
  WidgetsBinding.instance.addPostFrameCallback((_) {
    viewModel.fetchData();
  });
  super.initState();
}

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Future<void> main() async {
   
  setupLocator();
  runApp(
    MultiProvider(
      providers: [
        ChangeNotifierProvider(
          create: (_) => HomeViewModel(repo: locator<HomeRepo>()),
        ),
      ],

AseemWangoo

final GetIt locator = GetIt.instance;
void setupLocator() {
  locator.registerFactory<HomeRepository>(() => HomeRepoImpl());
  // Alternatively you could write it
  GetIt.I.registerFactory<HomeRepository>(HomeRepoImpl());
}

AseemWangoo

% docker exec -it redis redis-cli
127.0.0.1:6379> set key value
OK
127.0.0.1:6379> get key
"value"
127.0.0.1:6379> del key
(integer) 1
127.0.0.1:6379>

AseemWangoo

srv := &http.Server{
 Handler:      router,
 Addr:         ":8081",
 WriteTimeout: 15 * time.Second,
 ReadTimeout:  15 * time.Second,
}
log.Fatal(srv.ListenAndServe())

AseemWangoo

host := "127.0.0.1"
port := "5432"
user := "user"
password := "password"
dbname := "dbname"
psqlInfo := fmt.Sprintf("host=%s port=%s user=%s password=%s dbname=%s sslmode=disable", host, port, user, password, dbname)
result, err := sql.Open("postgres", psqlInfo)
if err != nil {  
   log.Fatalf("Error in connection : %s", err)
}