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Effective Dart for mobile developers Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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A little bit of history 2 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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A little bit of history → Client-optimized language for fast apps on any platform 2 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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A little bit of history → Client-optimized language for fast apps on any platform → Inspired by JS, Java, C#... 2 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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A little bit of history → Client-optimized language for fast apps on any platform → Inspired by JS, Java, C#... → Released in October 2011 2 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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A little bit of history → Client-optimized language for fast apps on any platform → Inspired by JS, Java, C#... → Released in October 2011 → v1.0 released in November 2013 2 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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A little bit of history → Client-optimized language for fast apps on any platform → Inspired by JS, Java, C#... → Released in October 2011 → v1.0 released in November 2013 → v2.0 released in December 2018 2 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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A little bit of history → Client-optimized language for fast apps on any platform → Inspired by JS, Java, C#... → Released in October 2011 → v1.0 released in November 2013 → v2.0 released in December 2018 → Currently in v2.7 2 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Everyone knows Dart already void main() => print('Hello Droidcon Madrid '); 4 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Everyone knows Dart already // hello.dart void main(List args) { var name = args[0] ?? 'John Doe'; print('Hello $name'); } // from your terminal $> dart hello.dart Droicon $> Hello Droidcon 5 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Everyone knows Dart already Future fetchPost() async { final response = await http.get('https://myblog.com/posts/1'); if (response.statusCode == 200) { return Post.fromJson(json.decode(response.body)); } else { throw Exception('Failed to load post'); } } 6 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Everyone knows Dart already Future fetchPost() async { final response = await http.get('https://myblog.com/posts/1'); if (response.statusCode == 200) { return Post.fromJson(json.decode(response.body)); } else { throw Exception('Failed to load post'); } } 6 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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What makes Dart special? 7 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Optimized for UI ! 8 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Optimized for UI 9 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Optimized for UI → Isolate-based concurrency 9 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Optimized for UI → Isolate-based concurrency → Event-loop execution model 9 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Optimized for UI → Isolate-based concurrency → Event-loop execution model → Future & Stream API 9 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Optimized for UI → Isolate-based concurrency → Event-loop execution model → Future & Stream API → UI-driven features: spread operator, collection if... 9 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Isolate-based concurrency 10 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Isolate-based concurrency → Space on the machine with: 10 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Isolate-based concurrency → Space on the machine with: → its own private memory 10 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Isolate-based concurrency → Space on the machine with: → its own private memory → single thread running an event loop 10 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Isolates are different than what we are used to 11 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Isolates are different than what we are used to → Javascript is single threaded 11 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Isolates are different than what we are used to → Javascript is single threaded → No shared memory => no locks! 11 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Isolates are different than what we are used to → Javascript is single threaded → No shared memory => no locks! → Go, Rust do not share memory 11 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Isolates are different than what we are used to → Javascript is single threaded → No shared memory => no locks! → Go, Rust do not share memory → Low level => you will rarely use them (only w ßhen needing big computation that will drop frames) 11 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Isolates Threads No shared memory Shared memory Communication via messages Communicatio n via messages or shared memory Processor time is equally shared Processor time is equally shared 12 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Event-loop execution model 13 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Future API 14 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Stream API 15 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Productive development ! 16 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Productive development 17 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Productive development → Hot-reload to see changes taking effect instantly 17 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Productive development → Hot-reload to see changes taking effect instantly → Incredible tooling out of the box 17 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Productive development → Hot-reload to see changes taking effect instantly → Incredible tooling out of the box → DartPad to try Dart on your browser 17 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Productive development → Hot-reload to see changes taking effect instantly → Incredible tooling out of the box → DartPad to try Dart on your browser → A package manager called pub 17 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Hot-reload for instant feedback 18 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Hot-reload for instant feedback 19 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Hot-reload for instant feedback → Thanks to Just-in-time compilation (JIT) 19 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Hot-reload for instant feedback → Thanks to Just-in-time compilation (JIT) → This is how Javascript compiles 19 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Incredible tooling out of the box: Timeline view 20 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Incredible tooling out of the box: Timeline view 21 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Incredible tooling out of the box: Timeline view 22 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Incredible tooling out of the box: Timeline view 23 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Incredible tooling out of the box: Logger 24 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Incredible tooling out of the box: Debugger 25 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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DartPad to try Dart on your browser 26 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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DartPad to try Dart on your browser 27 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Package manager: pub.dev 28 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Dependencies with pubspec.yaml name: she_said_yes_flutter description: My wedding has turned into an open source project version: 1.0.0+1 environment: sdk: ">=2.5.0 <3.0.0" dependencies: flutter: sdk: flutter bloc: 2.0.0 equatable: 1.0.1 flutter_bloc: 2.1.1 flutter_secure_storage: 3.3.1+1 dev_dependencies: flutter_test: sdk: flutter bloc_test: 2.2.0 mockito: 4.1.1 29 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Dependencies with pubspec.yaml name: she_said_yes_flutter description: My wedding has turned into an open source project version: 1.0.0+1 environment: sdk: ">=2.5.0 <3.0.0" dependencies: flutter: sdk: flutter bloc: 2.0.0 equatable: 1.0.1 flutter_bloc: 2.1.1 flutter_secure_storage: 3.3.1+1 dev_dependencies: flutter_test: sdk: flutter bloc_test: 2.2.0 mockito: 4.1.1 29 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Fast on all platforms ! 30 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Fast on all platforms 31 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Fast on all platforms → Ahead-of-time compilation to native machine code (AOT) 31 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Fast on all platforms → Ahead-of-time compilation to native machine code (AOT) → Target the web with its Javascript compiler 31 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Fast on all platforms → Ahead-of-time compilation to native machine code (AOT) → Target the web with its Javascript compiler → Run backend code as well 31 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Ahead-of-time compilation (AOT) 32 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Ahead-of-time compilation (AOT) → Needed to ship to the AppStore 32 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Ahead-of-time compilation (AOT) → Needed to ship to the AppStore → Compile to x64 machine code using dart2native 32 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Javascript: dart2js 33 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Javascript: dart2js → Use dart2js to compile Dart code to deployable Javascript 33 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Run backend code as well 34 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Run backend code as well 35 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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What makes Dart so easy? ! 36 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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What makes Dart so easy? 37 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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What makes Dart so easy? → final vs var 37 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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What makes Dart so easy? → final vs var → Optional and named parameters 37 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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What makes Dart so easy? → final vs var → Optional and named parameters → Easy to work with collections 37 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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What makes Dart so easy? → final vs var → Optional and named parameters → Easy to work with collections → Extension methods (as of v2.7) 37 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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What makes Dart so easy? → final vs var → Optional and named parameters → Easy to work with collections → Extension methods (as of v2.7) → Nullability (in preview now) 37 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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final vs var // can change values var name = 'Jorge'; name = 'George'; dynamic age = 21; age = 31; double pi = 3.14; pi = 3.14159; // can't change value once assigned final fullName = 'Jorge Coca'; const siblingName = 'Clara Coca'; 38 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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final vs var // can change values var name = 'Jorge'; name = 'George'; dynamic age = 21; age = 31; double pi = 3.14; pi = 3.14159; // can't change value once assigned final fullName = 'Jorge Coca'; const siblingName = 'Clara Coca'; 38 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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final vs var // can change values var name = 'Jorge'; name = 'George'; dynamic age = 21; age = 31; double pi = 3.14; pi = 3.14159; // can't change value once assigned final fullName = 'Jorge Coca'; const siblingName = 'Clara Coca'; 38 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Optional and named parameters Future authenticate({String username, String password}) { ... } authenticate(username: 'jorge', password: '1234'); Future tweet({@required String message, File image}) { ... } tweet(message: 'Droidcon Madrid!'); // tweet without media tweet(message: 'Droidcon Madrid!', image: File('selfie.png')); bool enableFeature(String featureName, bool darkMode = false) { ... } enableFeature('music_playlist'); // darkMode not enabled enableFeature('posts', true); 39 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Optional and named parameters Future authenticate({String username, String password}) { ... } authenticate(username: 'jorge', password: '1234'); Future tweet({@required String message, File image}) { ... } tweet(message: 'Droidcon Madrid!'); // tweet without media tweet(message: 'Droidcon Madrid!', image: File('selfie.png')); bool enableFeature(String featureName, bool darkMode = false) { ... } enableFeature('music_playlist'); // darkMode not enabled enableFeature('posts', true); 39 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Optional and named parameters Future authenticate({String username, String password}) { ... } authenticate(username: 'jorge', password: '1234'); Future tweet({@required String message, File image}) { ... } tweet(message: 'Droidcon Madrid!'); // tweet without media tweet(message: 'Droidcon Madrid!', image: File('selfie.png')); bool enableFeature(String featureName, bool darkMode = false) { ... } enableFeature('music_playlist'); // darkMode not enabled enableFeature('posts', true); 39 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Optional and named parameters Future authenticate({String username, String password}) { ... } authenticate(username: 'jorge', password: '1234'); Future tweet({@required String message, File image}) { ... } tweet(message: 'Droidcon Madrid!'); // tweet without media tweet(message: 'Droidcon Madrid!', image: File('selfie.png')); bool enableFeature(String featureName, bool darkMode = false) { ... } enableFeature('music_playlist'); // darkMode not enabled enableFeature('posts', true); 39 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Working with collections: spread operator final firstFive = [1, 2, 3, 4, 5]; final completeList = [0, ...firstFive, 6, 7, 8, 9]; assert(completeList.length == 10); //true 40 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Working with collections: spread operator final firstFive = [1, 2, 3, 4, 5]; final completeList = [0, ...firstFive, 6, 7, 8, 9]; assert(completeList.length == 10); //true 40 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Working with collections: collection if final tabs = [ 'Artists', 'Playlists', if (socialFeatureEnabled) 'Social', ]; 41 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Working with collections: collection for final bonusTracks = [ 'My Shot', 'The Story of Tonight', ]; final hamiltonAlbum = [ 'Alexander Hamilton', 'Aaron Burr, Sir', for (var bonus in bonusTracks) 'Bonus: $bonus', ]; main() => print(hamiltonAlbum); // [Alexander Hamilton, Aaron Burr, Sir, // Bonus: My Shot, Bonus: The Story of Tonight] 42 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Working with collections: collection for final bonusTracks = [ 'My Shot', 'The Story of Tonight', ]; final hamiltonAlbum = [ 'Alexander Hamilton', 'Aaron Burr, Sir', for (var bonus in bonusTracks) 'Bonus: $bonus', ]; main() => print(hamiltonAlbum); // [Alexander Hamilton, Aaron Burr, Sir, // Bonus: My Shot, Bonus: The Story of Tonight] 42 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Extension methods extension MyString on String { int plusLength(int number) => this.length + number; } void main() { final result = "Droidcon".plusLength(3); print(result); // 11 } 43 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Extension methods extension MyString on String { int plusLength(int number) => this.length + number; } void main() { final result = "Droidcon".plusLength(3); print(result); // 11 } 43 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Extension methods extension MyString on String { int plusLength(int number) => this.length + number; } void main() { final result = "Droidcon".plusLength(3); print(result); // 11 } 43 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Nullability (in preview mode) class Person { final String firstName; DateTime? birthday; Person(this.firstName, this.birthday); int? get year => birthday?.year; } 44 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Nullability (in preview mode) class Person { final String firstName; DateTime? birthday; Person(this.firstName, this.birthday); int? get year => birthday?.year; } 44 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Nullability (in preview mode) class Person { final String firstName; DateTime? birthday; Person(this.firstName, this.birthday); int? get year => birthday?.year; } 44 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Recap 45 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Recap → Easy, familiar syntax 45 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Recap → Easy, familiar syntax → Multiplatform, AOT, JIT 45 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Recap → Easy, familiar syntax → Multiplatform, AOT, JIT → Optimized for UI 45 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Recap → Easy, familiar syntax → Multiplatform, AOT, JIT → Optimized for UI → Isolate, event-loop 45 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Recap → Easy, familiar syntax → Multiplatform, AOT, JIT → Optimized for UI → Isolate, event-loop → Modern feature set 45 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Dart powers... 46 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Flutter powers... flutter.dev/showcase 47 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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If you liked this talk 48 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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If you liked this talk → Very Good Ventures, ex-BMW 48 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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If you liked this talk → Very Good Ventures, ex-BMW → ! @jcocaramos 48 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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If you liked this talk → Very Good Ventures, ex-BMW → ! @jcocaramos → ☕ jorgecoca.dev 48 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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If you liked this talk → Very Good Ventures, ex-BMW → ! @jcocaramos → ☕ jorgecoca.dev → Say hi! 48 — Jorge Coca, Very Good Ventures @ Droidcon Madrid 2019

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Thank you !