Try Dart 1 hour experience first draft

src/site/articles/trydart/examples/4-classbadge/piratebadge.dart

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:html';
+import 'dart:math' show Random;
+
+ButtonElement genButton;
+
+void  main() {
+  query('#inputName').onInput.listen(updateBadge);
+  genButton = query('#generateButton')
+      ..onClick.listen(generateBadge);
+}
+
+void updateBadge(Event e) {
+  String inputName = (e.target as InputElement).value;
+  
+  badgeName = new PirateName(firstName: inputName);
+  if (inputName.trim().isEmpty) {
+    genButton..disabled = false
+             ..text = 'Generate badge';
+  } else {
+    genButton..disabled = true
+             ..text = 'Arrr! Remove the text!';
+  }
+}
+
+void generateBadge(Event e) {
+  badgeName = new PirateName();
+}
+
+set badgeName(PirateName newName) {
+  query('#badgeName').text = newName.pirateName;
+}
+
+class PirateName {
+  
+  static final Random indexGen = new Random();
+
+  String _firstName;
+  String _appellation;
+
+  PirateName({String firstName, String appellation}) {
+    if (firstName == null) {
+      _firstName = names[indexGen.nextInt(names.length)];
+    } else {
+      _firstName = firstName;
+    }
+    if (appellation == null) {
+      _appellation = appellations[indexGen.nextInt(appellations.length)];
+    } else {
+      _appellation = appellation;
+    }
+  }
+
+  String toString() => pirateName;
+
+  String get pirateName => '$_firstName the $_appellation';
+
+  static final List names = [
+    'Anne', 'Mary', 'Jack', 'Morgan', 'Roger',
+    'Bill', 'Ragnar', 'Ed', 'John', 'Jane' ];
+  static final List appellations = [
+    'Black','Damned', 'Jackal', 'Red', 'Stalwart', 'Axe',
+    'Young', 'Old', 'Angry', 'Brave', 'Crazy', 'Noble'];
+}