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Our journey to Flutter

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We needed a Digital transformation

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We want to be able to regularly release our products across all brands, all platforms, and all regions simultaneously, with the same feature capabilities.

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Some of our challenges

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Some of our challenges → Multiple brands (BMW, MINI, BMW Motorrad...)

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Some of our challenges → Multiple brands (BMW, MINI, BMW Motorrad...) → Highly regulated markets

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Some of our challenges → Multiple brands (BMW, MINI, BMW Motorrad...) → Highly regulated markets → Teams distributed around the world

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Some of our challenges → Multiple brands (BMW, MINI, BMW Motorrad...) → Highly regulated markets → Teams distributed around the world → Security requirements and audits

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Some of our challenges → Multiple brands (BMW, MINI, BMW Motorrad...) → Highly regulated markets → Teams distributed around the world → Security requirements and audits → Fragmentation of devices and vehicles

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Learn from your past

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What can we do better?

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What can we do better? → Robust and predictable APIs

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What can we do better? → Robust and predictable APIs → Never say no to designers

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What can we do better? → Robust and predictable APIs → Never say no to designers → Be full stack and open

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What can we do better? → Robust and predictable APIs → Never say no to designers → Be full stack and open → Better understanding of business goals

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What can we do better? → Robust and predictable APIs → Never say no to designers → Be full stack and open → Better understanding of business goals → Shorter feature cycle times

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What can we do better? → Robust and predictable APIs → Never say no to designers → Be full stack and open → Better understanding of business goals → Shorter feature cycle times → Improve our developer experience

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Set goals for the future

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Our Engineering Vision Create a platform that is developer friendly, developer scalable, and performant, which provides safe experimentation and continuos deployment.

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How was the developer experience in 2018?

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How was the developer experience in 2018? → Divergent architectures

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How was the developer experience in 2018? → Divergent architectures → Android released after iOS

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How was the developer experience in 2018? → Divergent architectures → Android released after iOS → Platform silos, different experiences

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How was the developer experience in 2018? → Divergent architectures → Android released after iOS → Platform silos, different experiences → Non-friendly APIs

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How was the developer experience in 2018? → Divergent architectures → Android released after iOS → Platform silos, different experiences → Non-friendly APIs → Frustrating

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The Core Team

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Tech explored (March 2018) → Xamarin → React Native → Uber RIBs → Flutter

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Our Winner

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What happened to Flutter? (March 2018)

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What happened to Flutter? (March 2018) → Another cross-platform framework?

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What happened to Flutter? (March 2018) → Another cross-platform framework? → What is Flutter? And Dart?

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What happened to Flutter? (March 2018) → Another cross-platform framework? → What is Flutter? And Dart? → No Google Maps?

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What happened to Flutter? (March 2018) → Another cross-platform framework? → What is Flutter? And Dart? → No Google Maps? → Who uses it?

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What did we like about RIBs?

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Uber RIBs

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Uber RIBs → Shared architecture between iOS and Android

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Uber RIBs → Shared architecture between iOS and Android → Visual architecture

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Uber RIBs → Shared architecture between iOS and Android → Visual architecture → Aggressive composition

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Uber RIBs → Shared architecture between iOS and Android → Visual architecture → Aggressive composition → Develop features on isolation

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Uber RIBs → Shared architecture between iOS and Android → Visual architecture → Aggressive composition → Develop features on isolation → IDE tools to generate boilerplate

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Uber RIBs → Shared architecture between iOS and Android → Visual architecture → Aggressive composition → Develop features on isolation → IDE tools to generate boilerplate → Develop with Kotlin and Swift

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pssst... I even open sourced this repo: https://github.com/jorgecoca/uber-ribs-awesome-resources !

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...but after some time

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...but after some time → Felt like writing the same code twice

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...but after some time → Felt like writing the same code twice → UI language not tied to a platform

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...but after some time → Felt like writing the same code twice → UI language not tied to a platform → Organization challenges, duplicated efforts

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...but then, we tried Flutter again

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Back in March 2018, we did not understand the full potential of Flutter

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What happened to Flutter? (August 2018)

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What happened to Flutter? (August 2018) → Another cross-platform framework?

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What happened to Flutter? (August 2018) → Another cross-platform framework? → What is Flutter? And Dart?

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What happened to Flutter? (August 2018) → Another cross-platform framework? → What is Flutter? And Dart? → No Google Maps?

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What happened to Flutter? (August 2018) → Another cross-platform framework? → What is Flutter? And Dart? → No Google Maps? → Who uses it?

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What is Flutter?

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What is Flutter? → UI portable toolkit (iOS, Android, web...)

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What is Flutter? → UI portable toolkit (iOS, Android, web...) → Render at 60fps (and you can measure it)

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What is Flutter? → UI portable toolkit (iOS, Android, web...) → Render at 60fps (and you can measure it) → Everything is a widget

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What is Flutter? → UI portable toolkit (iOS, Android, web...) → Render at 60fps (and you can measure it) → Everything is a widget → Aggressive composition

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What is Flutter? → UI portable toolkit (iOS, Android, web...) → Render at 60fps (and you can measure it) → Everything is a widget → Aggressive composition → Incredible tooling out of the box

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What is Flutter? → UI portable toolkit (iOS, Android, web...) → Render at 60fps (and you can measure it) → Everything is a widget → Aggressive composition → Incredible tooling out of the box → Hot reload for faster development

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Flutter is like Picasso: you can ask it to paint anything, anywhere, and it will deliver outstanding results

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What is Dart?

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What is Dart? → Client-optimized language for fast apps on any platform

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What is Dart? → Client-optimized language for fast apps on any platform → Feels natural and familiar

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What is Dart? → Client-optimized language for fast apps on any platform → Feels natural and familiar → Easy to learn, but missing some features...

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What is Dart? → Client-optimized language for fast apps on any platform → Feels natural and familiar → Easy to learn, but missing some features... → Future API (async-await)

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What is Dart? → Client-optimized language for fast apps on any platform → Feels natural and familiar → Easy to learn, but missing some features... → Future API (async-await) → Isolate-based concurrency

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Why Dart?

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Why Dart? → Hot reload: see changes on real-time

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Why Dart? → Hot reload: see changes on real-time → Compile to ARM and x64 machine code

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Why Dart? → Hot reload: see changes on real-time → Compile to ARM and x64 machine code → Ahead of time (AOT) compilation

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Why Dart? → Hot reload: see changes on real-time → Compile to ARM and x64 machine code → Ahead of time (AOT) compilation → Just in time (JIT) compilation

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Why Dart? → Hot reload: see changes on real-time → Compile to ARM and x64 machine code → Ahead of time (AOT) compilation → Just in time (JIT) compilation → Modern tools (profile, debug, lint, observatory...)

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Dart Sample Future fetchTemperature() async { final response = await http.get('weather.com'); if (response.statusCode == 200) { print('Temperature: ${response.body}'); return; } else { throw Exception('Failed fetching temperature'); } }

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Dart Sample Future fetchTemperature() async { final response = await http.get('weather.com'); if (response.statusCode == 200) { print('Temperature: ${response.body}'); return; } else { throw Exception('Failed fetching temperature'); } }

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Dart Sample Future fetchTemperature() async { final response = await http.get('weather.com'); if (response.statusCode == 200) { print('Temperature: ${response.body}'); return; } else { throw Exception('Failed fetching temperature'); } }

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Dart Sample Future fetchTemperature() async { final response = await http.get('weather.com'); if (response.statusCode == 200) { print('Temperature: ${response.body}'); return; } else { throw Exception('Failed fetching temperature'); } }

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No Maps? (August 2018)

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No Maps? (August 2018) → Talked to Google about it

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No Maps? (August 2018) → Talked to Google about it → Packages openly developed

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No Maps? (August 2018) → Talked to Google about it → Packages openly developed → We could wait

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No Maps? (August 2018) → Talked to Google about it → Packages openly developed → We could wait → You can do it with Platform Channels

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Community and support

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Community and support → Vibrant and welcoming community

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Community and support → Vibrant and welcoming community → Started Chicago Flutter

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Community and support → Vibrant and welcoming community → Started Chicago Flutter → Incredible documentation and tutorials

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Community and support → Vibrant and welcoming community → Started Chicago Flutter → Incredible documentation and tutorials → More and more apps developed with Flutter

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...and many other benefits

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...and many other benefits → UI described as a tree

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...and many other benefits → UI described as a tree → Multiple state management solutions

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...and many other benefits → UI described as a tree → Multiple state management solutions → 3 levels of testing without 3rd party dependencies

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Flutter inspired us to transform our development practices, from top to bottom

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Published many articles in https://medium.com/flutter-community

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How do we use Flutter?

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How do we use Flutter?

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How do we use Flutter? → Integration with our backend

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How do we use Flutter? → Integration with our backend → Overall architecture

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How do we use Flutter? → Integration with our backend → Overall architecture → State management

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How do we use Flutter? → Integration with our backend → Overall architecture → State management → Testing and automation

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Integration with our backend

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Integration with our backend → By having full stack teams, we can have more control over client APIs

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Integration with our backend → By having full stack teams, we can have more control over client APIs → Limit business logic and processing on client

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Integration with our backend → By having full stack teams, we can have more control over client APIs → Limit business logic and processing on client → Backends for frontends

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Integration with our backend → By having full stack teams, we can have more control over client APIs → Limit business logic and processing on client → Backends for frontends → Feature toggles in backend

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Overall architecture

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State management, attempt #1

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State management, attempt #1

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Well, we do not use Redux anymore...

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State management, attempt #2: flutter_bloc

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flutter_bloc & equatable

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flutter_bloc & equatable → Inspired by MVI and BLoC

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flutter_bloc & equatable → Inspired by MVI and BLoC → Business logic out of UI

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flutter_bloc & equatable → Inspired by MVI and BLoC → Business logic out of UI → Predictable code

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flutter_bloc & equatable → Inspired by MVI and BLoC → Business logic out of UI → Predictable code → Easy to test: each action has a reaction

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flutter_bloc & equatable → Inspired by MVI and BLoC → Business logic out of UI → Predictable code → Easy to test: each action has a reaction → Automation (analytics, logs, errors...) in BlocDelegate

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Counter with flutter_bloc

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class CounterBloc extends Bloc { @override int get initialState => 0; @override Stream mapEventToState(CounterEvent event) async* { switch (event) { case CounterEvent.decrement: yield currentState - 1; break; case CounterEvent.increment: yield currentState + 1; break; } } }

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class CounterBloc extends Bloc { @override int get initialState => 0; @override Stream mapEventToState(CounterEvent event) async* { switch (event) { case CounterEvent.decrement: yield currentState - 1; break; case CounterEvent.increment: yield currentState + 1; break; } } }

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class CounterBloc extends Bloc { @override int get initialState => 0; @override Stream mapEventToState(CounterEvent event) async* { switch (event) { case CounterEvent.decrement: yield currentState - 1; break; case CounterEvent.increment: yield currentState + 1; break; } } }

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class CounterBloc extends Bloc { @override int get initialState => 0; @override Stream mapEventToState(CounterEvent event) async* { switch (event) { case CounterEvent.decrement: yield currentState - 1; break; case CounterEvent.increment: yield currentState + 1; break; } } }

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class CounterBloc extends Bloc { @override int get initialState => 0; @override Stream mapEventToState(CounterEvent event) async* { switch (event) { case CounterEvent.decrement: yield currentState - 1; break; case CounterEvent.increment: yield currentState + 1; break; } } }

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class CounterBloc extends Bloc { @override int get initialState => 0; @override Stream mapEventToState(CounterEvent event) async* { switch (event) { case CounterEvent.decrement: yield currentState - 1; break; case CounterEvent.increment: yield currentState + 1; break; } } }

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class CounterPage extends StatelessWidget { @override Widget build(BuildContext context) { final CounterBloc counterBloc = BlocProvider.of(context); return Scaffold( body: BlocBuilder( builder: (context, count) { return Text('$count'); },), floatingActionButton: Column( children: [ FloatingActionButton( onPressed: () { counterBloc.dispatch(CounterEvent.increment); }, ), FloatingActionButton( onPressed: () { counterBloc.dispatch(CounterEvent.decrement); }, ), ...

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class CounterPage extends StatelessWidget { @override Widget build(BuildContext context) { final CounterBloc counterBloc = BlocProvider.of(context); return Scaffold( body: BlocBuilder( builder: (context, count) { return Text('$count'); },), floatingActionButton: Column( children: [ FloatingActionButton( onPressed: () { counterBloc.dispatch(CounterEvent.increment); }, ), FloatingActionButton( onPressed: () { counterBloc.dispatch(CounterEvent.decrement); }, ), ...

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class CounterPage extends StatelessWidget { @override Widget build(BuildContext context) { final CounterBloc counterBloc = BlocProvider.of(context); return Scaffold( body: BlocBuilder( builder: (context, count) { return Text('$count'); },), floatingActionButton: Column( children: [ FloatingActionButton( onPressed: () { counterBloc.dispatch(CounterEvent.increment); }, ), FloatingActionButton( onPressed: () { counterBloc.dispatch(CounterEvent.decrement); }, ), ...

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class CounterPage extends StatelessWidget { @override Widget build(BuildContext context) { final CounterBloc counterBloc = BlocProvider.of(context); return Scaffold( body: BlocBuilder( builder: (context, count) { return Text('$count'); },), floatingActionButton: Column( children: [ FloatingActionButton( onPressed: () { counterBloc.dispatch(CounterEvent.increment); }, ), FloatingActionButton( onPressed: () { counterBloc.dispatch(CounterEvent.decrement); }, ), ...

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class CounterPage extends StatelessWidget { @override Widget build(BuildContext context) { final CounterBloc counterBloc = BlocProvider.of(context); return Scaffold( body: BlocBuilder( builder: (context, count) { return Text('$count'); },), floatingActionButton: Column( children: [ FloatingActionButton( onPressed: () { counterBloc.dispatch(CounterEvent.increment); }, ), FloatingActionButton( onPressed: () { counterBloc.dispatch(CounterEvent.decrement); }, ), ...

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class CounterPage extends StatelessWidget { @override Widget build(BuildContext context) { final CounterBloc counterBloc = BlocProvider.of(context); return Scaffold( body: BlocBuilder( builder: (context, count) { return Text('$count'); },), floatingActionButton: Column( children: [ FloatingActionButton( onPressed: () { counterBloc.dispatch(CounterEvent.increment); }, ), FloatingActionButton( onPressed: () { counterBloc.dispatch(CounterEvent.decrement); }, ), ...

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class CounterPage extends StatelessWidget { @override Widget build(BuildContext context) { final CounterBloc counterBloc = BlocProvider.of(context); return Scaffold( body: BlocBuilder( builder: (context, count) { return Text('$count'); },), floatingActionButton: Column( children: [ FloatingActionButton( onPressed: () { counterBloc.dispatch(CounterEvent.increment); }, ), FloatingActionButton( onPressed: () { counterBloc.dispatch(CounterEvent.decrement); }, ), ...

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lumberdash void main() { putLumberdashToWork(withClient: SimpleClient()); logWarning('Hello Warning'); logFatal('Hello Fatal!'); logMessage('Hello Message!'); logError(Exception('Hello Error')); }

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lumberdash clients

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lumberdash clients → SimpleClient

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lumberdash clients → SimpleClient → ColorizeClient

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lumberdash clients → SimpleClient → ColorizeClient → SentryClient

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lumberdash clients → SimpleClient → ColorizeClient → SentryClient → FirebaseClient

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flutter_bloc & lumberdash class CounterBlocDelegate extends BlocDelegate { final LumberdashClient lumberdashClient; CounterBlocDelegate(this.lumberdashClient); @override void onTransition(Transition transition) { super.onTransition(transition); lumberdashClient.logMessage(transition.toString()); } void onError(Object error, StackTrace stacktrace) { super.onError(error, stacktrace); lumberdashClient.logError(error, stacktrace); } }

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flutter_bloc & lumberdash Without developer effort, we can report logs, analytics, and errors to the proper system depending on the build flavor, in an automated way.

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Testing and automation

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Testing and automation → Remove manual intervention (lint and format, analyzer, translations...)

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Testing and automation → Remove manual intervention (lint and format, analyzer, translations...) → 3 levels of testing: unit, widget, and integration

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Testing and automation → Remove manual intervention (lint and format, analyzer, translations...) → 3 levels of testing: unit, widget, and integration → 100% coverage by default

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ozzie.flutter

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void main() { FlutterDriver driver; Ozzie ozzie; setUpAll(() async { driver = await FlutterDriver.connect(); ozzie = Ozzie.initWith(driver, groupName: 'counter'); }); tearDownAll(() async { if (driver != null) driver.close(); ozzie.generateHtmlReport(); }); test('initial counter is 0', () async { await ozzie.profilePerformance('counter0', () async { await driver.waitFor(find.text('0')); await ozzie.takeScreenshot('initial_counter_is_0'); await driver.tap(find.byType('FloatingActionButton')); await driver.waitFor(find.text('1')); await ozzie.takeScreenshot('counter_is_1'); }); }); }

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void main() { FlutterDriver driver; Ozzie ozzie; setUpAll(() async { driver = await FlutterDriver.connect(); ozzie = Ozzie.initWith(driver, groupName: 'counter'); }); tearDownAll(() async { if (driver != null) driver.close(); ozzie.generateHtmlReport(); }); test('initial counter is 0', () async { await ozzie.profilePerformance('counter0', () async { await driver.waitFor(find.text('0')); await ozzie.takeScreenshot('initial_counter_is_0'); await driver.tap(find.byType('FloatingActionButton')); await driver.waitFor(find.text('1')); await ozzie.takeScreenshot('counter_is_1'); }); }); }

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void main() { FlutterDriver driver; Ozzie ozzie; setUpAll(() async { driver = await FlutterDriver.connect(); ozzie = Ozzie.initWith(driver, groupName: 'counter'); }); tearDownAll(() async { if (driver != null) driver.close(); ozzie.generateHtmlReport(); }); test('initial counter is 0', () async { await ozzie.profilePerformance('counter0', () async { await driver.waitFor(find.text('0')); await ozzie.takeScreenshot('initial_counter_is_0'); await driver.tap(find.byType('FloatingActionButton')); await driver.waitFor(find.text('1')); await ozzie.takeScreenshot('counter_is_1'); }); }); }

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void main() { FlutterDriver driver; Ozzie ozzie; setUpAll(() async { driver = await FlutterDriver.connect(); ozzie = Ozzie.initWith(driver, groupName: 'counter'); }); tearDownAll(() async { if (driver != null) driver.close(); ozzie.generateHtmlReport(); }); test('initial counter is 0', () async { await ozzie.profilePerformance('counter0', () async { await driver.waitFor(find.text('0')); await ozzie.takeScreenshot('initial_counter_is_0'); await driver.tap(find.byType('FloatingActionButton')); await driver.waitFor(find.text('1')); await ozzie.takeScreenshot('counter_is_1'); }); }); }

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... before we finish, a little bit of self promotion...

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Dart 2 In Action

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Dart 2 In Action → Mom! I am writing a book!

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Dart 2 In Action → Mom! I am writing a book! → Published by Manning Publications

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Dart 2 In Action → Mom! I am writing a book! → Published by Manning Publications → Soon to be in Early Access Preview (MEAP)

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Dart 2 In Action → Mom! I am writing a book! → Published by Manning Publications → Soon to be in Early Access Preview (MEAP) → Flutter in Action already in MEAP

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Droidcon NYC 2019

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Droidcon NYC 2019 → August 26th ad 27th

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Droidcon NYC 2019 → August 26th ad 27th → Flutter at scale

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Questions, comments, feedback... ?

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Questions, comments, feedback... ? → @jcocaramos

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Questions, comments, feedback... ? → @jcocaramos → @ChicagoFlutter

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Questions, comments, feedback... ? → @jcocaramos → @ChicagoFlutter → github.com/bmw-tech

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Questions, comments, feedback... ? → @jcocaramos → @ChicagoFlutter → github.com/bmw-tech → jorgecoca.dev ( )

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