Draft of new codelab for review

src/site/codelabs/darrrt/examples/6-piratebadge_json/piratebadge.dart

Index: src/site/codelabs/darrrt/examples/6-piratebadge_json/piratebadge.dart
diff --git a/src/site/codelabs/darrrt/examples/6-piratebadge_json/piratebadge.dart b/src/site/codelabs/darrrt/examples/6-piratebadge_json/piratebadge.dart
deleted file mode 100644
index d4274306aa2d9dbf23567ec74cfee1f9413e06ca..0000000000000000000000000000000000000000
--- a/src/site/codelabs/darrrt/examples/6-piratebadge_json/piratebadge.dart
+++ /dev/null
@@ -1,151 +0,0 @@
-// 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.
-
-
-// Demonstrates:
-// list, maps, random, strings, string interpolation
-// cascade, fat arrow, ternary operator
-// named constructors
-// optional parameters
-// a class
-// getters
-// httprequest, JSON
-// local storage
-// static class-level methods/fields
-// top-level variables and functions
-// typecasting with 'as'
-// futures
-// import, also with show
-// dart:core, html, math, convert and async libraries
-
-import 'dart:html';
-import 'dart:math' show Random;
-import 'dart:convert' show JSON;
-import 'dart:async' show Future;
-
-final String TREASURE_KEY = 'pirateName';
-
-ButtonElement genButton;
-SpanElement badgeNameElement;
-
-void  main() {
-  InputElement inputField = querySelector('#inputName');
-  inputField.onInput.listen(updateBadge);
-  genButton = querySelector('#generateButton');
-  genButton.onClick.listen(generateBadge);
-  
-  badgeNameElement = querySelector('#badgeName');
-  
-  PirateName.readyThePirates()
-    .then((_) {
-      //on success
-      inputField.disabled = false; //enable
-      genButton.disabled = false;  //enable
-      setBadgeName(getBadgeNameFromStorage());
-    })
-    .catchError((arrr) {
-      print('Error initializing pirate names: $arrr');
-      badgeNameElement.text = 'Arrr! No names.';
-    });
-}
-
-void updateBadge(Event e) {
-  String inputName = (e.target as InputElement).value;
-  
-  setBadgeName(new PirateName(firstName: inputName));
-  if (inputName.trim().isEmpty) {
-    genButton..disabled = false
-             ..text = 'Aye! Gimme a name!';
-  } else {
-    genButton..disabled = true
-             ..text = 'Arrr! Write yer name!';
-  }
-}
-
-void generateBadge(Event e) {
-  setBadgeName(new PirateName());
-}
-
-void setBadgeName(PirateName newName) {
-  if (newName == null) {
-    return;
-  }
-  badgeNameElement.text = newName.pirateName;
-  window.localStorage[TREASURE_KEY] = newName.jsonString;
-}
-
-PirateName getBadgeNameFromStorage() {
-  String storedName = window.localStorage[TREASURE_KEY];
-  if (storedName != null) {
-    return new PirateName.fromJSON(storedName);
-  } else {
-    return null;
-  }
-}
-
-/* 
- * A class declaration.
- */
-class PirateName {
-  
-  // static variables are shared by all instances.
-  // Random is a random number generator in dart:math.
-  static final Random indexGen = new Random();
-
-  // List is a parameterized type. You can declare the type of the objects it contains.
-  static List<String> names = [];
-  static List<String> appellations = [];
-
-  // Instance variables. Private variables have names that start with underscore '_'.
-  String _firstName;
-  String _appellation;
-  
-  // A constructor with two optional, named parameters.
-  PirateName({String firstName, String appellation}) {
-    
-    // Use nextInt to get a random integer from a Random object.
-    // Use length to get the number of items in a list.
-    if (firstName == null) {
-      _firstName = names[indexGen.nextInt(names.length)];
-    } else {
-      _firstName = firstName;
-    }
-    if (appellation == null) {
-      _appellation = appellations[indexGen.nextInt(appellations.length)];
-    } else {
-      _appellation = appellation;
-    }
-  }
-
-  // A named constructor.
-  PirateName.fromJSON(String jsonString) {
-    // JSON is the default implementation of a JSON encoder/decoder.
-    // Map is a collection of key-value pairs.
-    Map storedName = JSON.decode(jsonString);
-    _firstName = storedName['f'];
-    _appellation = storedName['a'];
-  }
-
-  // Fat arrow syntax is shorthand for a one-line function that returns a value.
-  String toString() => pirateName;
-
-  // A getter provides read access to the member of an object.
-  String get jsonString => '{ "f": "$_firstName", "a": "$_appellation" } ';
-
-  // The ternary operator is shorthand for if-then-else. 
-  // String interpolation lets you easily build strings from other objects.
-  String get pirateName => _firstName.isEmpty ? '' : '$_firstName the $_appellation';
-
-  static Future readyThePirates() {
-    String path = 'piratenames.json';
-    return HttpRequest.getString(path)
-        .then(_parsePirateNamesFromJSON);
-  }
-  
-  static _parsePirateNamesFromJSON(String jsonString) {
-    Map pirateNames = JSON.decode(jsonString);
-    names = pirateNames['names'];
-    appellations = pirateNames['appellations'];
-  }
-}