mono0926

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:riverpod/riverpod.dart';

// 1つ目のStreamProvider
final authUserProvider =
    StreamProvider<User?>((ref) => FirebaseAuth.instance.userChanges());

// 2つ目のStreamProvider
// authUserProviderをwatchした値を使ってFirestoreから得られるStreamを返す

mono0926

import 'package:flutter/material.dart';

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

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

  @override

mono0926

import 'package:flutter/material.dart';

void main() => runApp(const App());

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

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(

mono0926

import 'dart:async';

import 'package:flutter_test/flutter_test.dart';
import 'package:rxdart/rxdart.dart';

void main() {
  test('', () async {
    // broadcast取ると、expectはtrueになる
    // BehaviorSubjectでも、expectはtrueになる
    final controller = StreamController<bool>.broadcast();

mono0926

class PackageMetrics extends StateNotifier<AsyncValue<PackageMetricsScore>> {
  PackageMetrics(this._ref, {required this.packageName})
      : super(const AsyncLoading()) {
    _ref
        .watch(pubRepositoryProvider)
        .getPackageMetrics(packageName: packageName)
        .then((value) => state = AsyncData(value));
  }

  final AutoDisposeRef _ref;

mono0926

class PackageMetrics
// AutoDispose/Family版のAsyncNotifier
    extends AutoDisposeFamilyAsyncNotifier<PackageMetricsScore, String> {
  late String _packageName;
  @override
  Future<PackageMetricsScore> build(String arg) {
    _packageName = arg;
    return ref
        .watch(pubRepositoryProvider)
        .getPackageMetrics(packageName: _packageName);

mono0926

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';

void main() {
  runApp(
    const ProviderScope(
      child: App(),
    ),
  );

mono0926

import 'package:quiver/collection.dart';

void main() {
  // maximumSizeのデフォルトは100
  final cache = LruMap<String, int>(maximumSize: 3);

  cache['a'] = 1;
  print(cache['a']); // 1
  cache['b'] = 2;
  print(cache['a']); // 1

mono0926

- json['foo'] as Map<String, dynamic>),
+ Map<String, dynamic>.from(json['foo'] as Map)),

mono0926

// ignore_for_file: omit_local_variable_types, prefer_final_locals, equal_elements_in_set
import 'dart:collection';

void main() {
  // Setのデフォルト実装は、順番が保たれる LinkedHashSet
  Set<String> animals = {'dog', 'dog', 'cat'};
  // 常に[dog, cat]
  print(animals.toList());

  Set<String> animals2 = HashSet.of(['dog', 'dog', 'cat']);