[Jana Moudrá] Let's play Dart

Presentation from GDG DevFest Ukraine 2015 - the biggest Google related event in the country. October 23-24, Lviv. Learn more at http://devfest.gdg.org.ua/

Transcript

1. Let's play Dart! Jana Moudrá @Janamou +JanaMoudra www.moudra.net Juicymo #dfua
2. Let's write a Web App...
3. No fairy tales today
4. What is Dart? #dfua
5. Language Easy to learn Modular Great tools
6. Language Easy to learn Modular Great tools Let's learn Dart in a few minutes
7. class Person { String name; int age; Person(this.name, this.age); } Person person = new Person("Peter", 18); Easy to learn
8. class Person { var name; var age; Person(this.name, this.age); } var person = new Person("Peter", 18); Types are optional
9. var name; //is null int count; //is null Default value no undefined in Dart
10. if (name is String) { print("$name is String"); } Checking types
11. Person person = new Person(); person.name = "Peter"; person.age = 18; person.hairColor = "brown"; Normal developer life
12. Person person = new Person() ..name = "Peter" ..age = 18 ..hairColor = "brown"; Hello .. operator
13. Me + Dart = Productivity #dfua
14. Great docs Tools and libraries async/await Null-Aware operators
15. pub
16. name: my_super_app version: 0.1.0 description: My super application! dependencies: args: any pubspec.yaml
17. name: my_super_app version: 0.1.0 description: My super application! dependencies: args: any pubspec.yaml $ pub get Resolving dependencies... Got dependencies!
18. dart:async, dart:collection, dart:convert, dart:core, dart:developer, dart:html, dart:indexed_db, dart:io, dart:isolate, dart:js, dart: math, dart:mirrors, dart:svg, dart: typed_data, dart:web_audio, dart:web_gl, dart:web_sql
19. HttpRequest .getString("animals.json") .then(feedAnimals); Before async/await era
20. feedAnimals(await HttpRequest .getString("animals.json")); We can do it better
21. if (person != null) { person.sayHello(); } Null everywhere...
22. person?.sayHello(); Hello Null-Aware
23. person?.sayHello(); Hello Null-Aware and that's not all...
24. Not only for client side #dfua
25. Not only for client side server side command line mobile #dfua
26. Client side Web Browser Compiles to JavaScript Lots of libraries
27. Server side Dart VM Lots of frameworks Integration with databases App Engine, Firebase etc...
28. Command line
29. On mobile?
30. On mobile Fletch Flutter
31. Fletch Flutter dartlang.org/mobile flutter.io On mobile
32. Developer Utilities #dfua
33. Tests rule the world code Package test test("Person is Jana", () { Person person = new Person("Jana"); expect(person.name, equals("Jana")); });
34. Documentation for everything /** * [ProcessResult] represents the result of * running a non-interactive process started with * [Process.run] or [Process.runSync]. */ class ProcessResult {
35. Dartdoc
36. Observatory is your best friend Profiling Dart code Code coverage Debugging memory leaks ...
37. Observatory
38. That's not all! Stagehand dartfmt Grinder … and more on pub.dartlang.org
39. Why should I use Dart? #dfua
40. #IJSAWTC
41. I Just Sit And Write The Code!
42. I Just Sit And Write The Code! for client for server for command line
43. Let's play Dart tomorrow Dart Code Lab Sat, 14:50 - 15:30, Community hall #dfua
44. Jana Moudrá @Janamou +JanaMoudra www.moudra.net Juicymo Questions? #dfua
45. Image credits • Matthew Keefe, cc, https://www.flickr.com/photos/60243770@N00/3123775954/ • Mari Wirta, cc https://www.flickr.com/photos/64194626@N03/6292870807/ • jenny downing, cc, https://www.flickr. com/photos/7941044@N06/3990391143/ • Kjetil Korslien, cc https://www.flickr.com/photos/kjetikor/8484119632/ • Kārlis Dambrāns, cc https://www.flickr.com/photos/janitors/16524906898