hawkkiller

import 'package:analytics_example/analytics_property.dart';

/// A builder for analytics properties.
///
/// This class is used to build a map of properties
/// that can be sent to an analytics service.
final class AnalyticsBuilder {
  AnalyticsBuilder() : properties = [];

  /// The properties that have been added to this builder.

hawkkiller

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

void main() {
  runApp(const MainApp());
}

class MainApp extends StatelessWidget {
  const MainApp({super.key});

hawkkiller

import 'dart:collection';

abstract interface class AnalyticsReporter {
  Future<void> reportEvent(AnalyticsEvent event);
}

final class FirebaseReporter implements AnalyticsReporter {
  final FirebaseAnalytics _firebaseAnalytics;

  @override

hawkkiller

import 'package:shared_preferences/shared_preferences.dart';

/// {@template preferences_dao}
/// Class that provides seamless access to the shared preferences.
///
/// Inspired by https://pub.dev/packages/typed_preferences
/// {@endtemplate}
abstract base class PreferencesDao {
  final SharedPreferences _sharedPreferences;

hawkkiller

import 'dart:async';

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

void main() {
  runApp(const MainApp());
}

class MainApp extends StatefulWidget {

hawkkiller

void main() {
  // create final variables that reference canonical object
  final a = const A('A');
  final b = const A('A');
  
  // check if both a and b reference the same object
  print(identical(a, b)); // True
  
  // strings are const by default
  // note, that str reference canonical object of type String

hawkkiller

class Bird {
  void fly() {
    print('The bird is flying.');
  }
}

class Ostrich extends Bird {
  @override
  void fly() {
    throw UnsupportedError('Ostriches cannot fly.');

hawkkiller

abstract interface class Account {
  double get balance;
}

class SavingsAccount implements AccountType {
  double balance;

  SavingsAccount(this.balance);
}

hawkkiller

sealed class Shape {
  double calcSquare();
}

class Circle extends Shape {
  Circle(this.radius);

  final double radius;
  
  @override

hawkkiller

sealed class Shape {}

class Circle extends Shape {
 Circle(this.radius);

 final double radius;
}

class Rectangle extends Shape {
 Rectangle(this.width, this.height);