evaisse

Development Stack with Flutter

• Flutter app, with provider for dependency management.
• Always run flutter analyze to fix all errors, when there is errors, just run dart fix --apply before trying to manipulate the code by yourself
• Always ensure your code is fully tested, with flutter test() or widgetTest(), add be generous with goldenTest and screen captures also
• Always prefer type-safe alternative to dynamic, late and other risky behaviors
• Do not cast with as keyword, but always prefer pattern matching to safely cast and test types
• Never use the dynamic keyword, nor late, but prefer Object? which is safer
• Always use flutter theme extension to allow UI customization, for every group of UI widgets you build, add a theme extension and refer to hit using context to customize the widgets.

evaisse

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

class ServiceBuilder<T extends Service> {
  final T Function(BuildContext context) create;

  ServiceBuilder(this.create);

  Provider<T> asProvider(ValueNotifier<BuildContext> scope) =>
      Provider<T>(create: (_) => create(scope.value));

evaisse

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

/// Represents a city using a record, with its name (including flag emoji),
/// population, and seaside status.
/// Records provide automatic equality and hash code implementation.
typedef City = ({String name, int population, bool isSeaside});

/// Manages the selection of a city and provides available city data.
///

evaisse

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

/// Data model for the counter, extending ChangeNotifier to notify listeners of changes.
class CounterData extends ValueNotifier<int> {
  CounterData() : super(0);

  void increment() => value = value + 1;
}

evaisse

/// Attention à TOUJOURS typer le retour des callback/builders 
/// que vous allez passer aux widgets/controllers.
class Foo {
  Function()? onFoo;
  void Function()? onFoufou;
  Foo({ this.onFoo, this.onFoufou });
}

void main() {
  

evaisse

 
/// General demonstration about the annoying way to set to null a copy of another object
///
/// @see https://github.com/dart-lang/language/issues/877
/// @see https://stackoverflow.com/questions/68009392/dart-custom-copywith-method-with-nullable-properties
class Person {
  final String name;
  final String? nickName;

  Person({required this.name, this.nickName});

evaisse

import 'dart:convert';
import 'dart:math';
import 'dart:typed_data';

import 'package:basic_utils/basic_utils.dart';
import 'package:encrypt/encrypt.dart';
// ignore: depend_on_referenced_packages
import 'package:crypto/crypto.dart';
import 'package:flutter/foundation.dart' as flutter;
import 'package:pointycastle/export.dart';

evaisse

// Définition d'une classe scellée pour représenter un résultat
// Sealed class : https://dart.dev/language/class-modifiers#sealed
sealed class ASealedClass {}
// cas 1
class Success extends ASealedClass {}
// cas 2
class Failure extends ASealedClass {}

/// sous la forme d'un enum
enum AnEnum { success, error }

evaisse

void main() {
  
  dynamic myDynamicValue = null;
 
  myDynamicValue.length;
  
  Object? myTypedValue = myDynamicValue;
  
  myTypedValue.length; // that's helpful
  

evaisse

class Generic<T> {
  final T that;
  Generic(this.that);
}

class TypedGeneric<T extends Object> {
  final T that;
  TypedGeneric(this.that);
}