Bullseye! – Let's play Dart

JUG Erlangen Nürnberg – 2014-12-11

Transcript

1. BULLSEYE! LET'S PLAY DART – / Florian Hirsch adorsys @le oh github.com/le oh
2. DART IS A NEW LANGUAGE WITH TOOLS AND LIBRARIES FOR SCALABLE WEB APP ENGINEERING
3. WHY?
4. DESIGN GOALS Structured yet exible programming language for the web. Familiar and natural to programmers. Appropriate for the full range of devices on the web. Tools to support all major modern browsers. Florian Loitsch / Riviera DEV, 20.10.2011 Dart: An Introduction
5. CRITICS — Brendan Eich “I guarantee you that Apple and Microsoft (...) will never embed the Dart VM. So 'Works best in Chrome' and even 'Works only in Chrome' are new norms promulgated intentionally by Google.”
6. SPEED OF DART 10.10.2010: First Announcement on GOTO Aarhus 14.11.2013: 1.0 25.06.2014: 1.3 – ECMA-408 26.06.2014: 1.5 27.08.2014: 1.6 15.10.2014: 1.7 28.11.2014: 1.8
7. HELLO WORLD main() { print('Hello World'); }
8. SCRIPT-LIKE const THE_ANSWER = 42; print('half of the answer is ${THE_ANSWER / 2}'); var list = [1, 2, 3]; list.forEach((e) => print(e)); var map = { 'foo' : 12 }; map['bar'] = 13; map.forEach((k, v) => print('$k * 2 = ${v * 2}')); concat(a, b) => a + b; var foobar = concat('foo', 'bar');
9. JAVA-LIKE /// the superhero class class Superhero { String name; Superhero(this.name); toString() => 'I am $name!'; } main() { Superhero batman = new Superhero('Batman'); print(batman); }
10. OPTIONALLY TYPED
11. NO SURPRISES! Playback isn't supported on this device. 0:00 / 0:00
12. FAMILIAR uses curly braces :) only true is truthy only null – no undefined no hoisting
13. SYNTACTIC SUGAR class Superhero extends Person with SuperPower { String name; String _realName; Superhero.withRealName(this._realName); String get realName => _realName; set realName(realName) => _realName = realName is String ? realName : 'UNKNOWN'; void train({times: 1}) { } Team operator +(Superhero other) => new Team([this, other]); } main() { var superman = new Superhero.withRealName("Clark Kent")..name = "Superman"; superman.train(times: 4); }
14. NEW class Cache { static final Cache _INSTANCE = new Cache._internal(); static Map<String, String> _store; factory Cache() { if (_store == null) { _store = <String, String>{}; } return _INSTANCE; } Cache._internal(); } var cache = new Cache();
15. LIBRARIES built-in modules unit of privacy every Dart App is a library Pub the package manager (> 1400 libraries)
16. BUILD AND DEPLOYMENT dart2js Dart VM (Standalone / Chromium) Language VM (no bytecode!) Full / Script / Object Snapshots Docker Images on AppEngine
17. PERFORMANCE Dart Benchmarks Dart IO Benchmarks The Performance of Dart 1.3 Is on Par with Node.js
18. WOULD YOU PLAY DART?