Try Dart 1 hour experience first draft

src/site/codelabs/darrrt/index.markdown

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+---
+layout: default
+title: "Try Dart"
+description: "Write some Dart code. Learn some stuff."
+has-permalinks: true
+tutorial:
+  id: trydart
+js:
+- url: /js/os-switcher.js
+  defer: true
+- url: /js/editor-downloads-analytics.js
+  defer: true
+- url: /js/editor-version.js
+  defer: true
+header:
+  css: ["/codelabs/darrrt/darrrt.css"]
+---
+
+# {{ page.title }}
+
+## Got an hour? Write a Dart app.
+
+In this code lab,
+you build a pirate badge generator from a skeleton app.
+The sample app provides a brief look at some Dart language and library features.
+This code lab assumes that you have some programming experience.
+
+<strong>Build this app!</strong>
+
+<iframe class="running-app-frame"
+        style="height:220px;width:530px;"
+        src="examples/6-piratebadge_json/piratebadge.html">
+</iframe>
+
+<hr>
+
+## The Map
+
+* [Step 0: Set up](#set-up)
+* [Step 1: Run the skeleton app](#step-one)
+* [Step 2: Add an input field](#step-two)
+* [Step 3: Add a button](#step-three)
+* [Step 4: Create a class](#step-four)
+* [Step 5: Save to local storage](#step-five)
+* [Step 6: Read names from JSON file using HttpRequest](#step-six)
+* [Step 7: Go forth and learn more about Dart](#step-seven)
+
+
+<hr>
+
+## Step 0: Set up {#set-up}
+
+In this step, you download Dart and get the sample code.
+
+
+#### <i class="icon-anchor"> </i> Get Dart.
+
+<div class="trydart-step-details" markdown="1">
+If you haven't already done so,
+get the Dart download.
+Unzip the ZIP file, which creates a directory called `dart`.
+
+{% include downloads/_dart-editor.html %}
+
+<p markdown="1">
+  The Dart tools
+  work in recent versions of
+  {% include os-choices.html %}
+</p>
+</div>
+
+#### <i class="icon-anchor"> </i> Start the editor.
+
+<div class="trydart-step-details" markdown="1">
+Go to the `dart` directory and double-click **DartEditor**.
+
+**Got questions? Having trouble?** Go to the
+[Troubleshooting Dart Editor](/tools/editor/troubleshoot.html) page.
+
+</div>
+
+#### <i class="icon-anchor"> </i> Get the sample code.
+
+<div class="trydart-step-details" markdown="1">
+<a href="https://github.com/dart-lang/one-hour-codelab/archive/master.zip">Download</a>
+the sample code.
+Unzip the ZIP file,
+which creates a directory called `one-hour-codelab-master`.
+</div>
+
+#### <i class="icon-anchor"> </i> Open the one-hour-codelab-master sample.
+
+<div class="trydart-step-details" markdown="1">
+In Dart Editor,
+use **File > Open Existing Folder...**
+to open the `one-hour-codelab-master` directory.
+</div>
+
+<div class="row"> <div class="span7" markdown="1">
+
+![The files and directories in the piratebadge directory.](images/filesanddirs.png)
+
+</div> <div class="span5" markdown="1">
+
+<i class="icon-key"> </i> <strong> Key Information </strong>
+
+* The `packages` directory, as well as the `pubspec.yaml` and `pubspec.lock` files are
+related to package dependencies.
+This project has all the dependencies set up for you.
+Dart Editor automatically installs the necessary packages.
+
+* Several numbered directories contain the completed code for each step.
+`1-blankbadge` contains the skeletal version of the app that you begin with.
+`6-piratebadge_json` contains the final version of the app.
+
+* The `piratebadge.css` file
+provides the CSS styles for all steps of the app.
+You don't change this file during this code lab.
+
+&nbsp; {% comment %} non-breaking space required for bootstrap/markdown bogosity {% endcomment %}
+
+</div> </div>
+
+<hr>
+
+##Step 1: Run the skeleton app {#step-one}
+
+In this step, you open the source files,
+familiarize yourself with the Dart and HTML code,
+and run the app.
+
+#### <i class="icon-anchor"> </i> Expand the 1-blankbadge directory.
+
+<div class="trydart-step-details" markdown="1">
+In Dart Editor, expand the `1-blankbadge` directory
+by clicking the little arrow
+![wee arrow](images/wee-arrow.png) to the left of its name.
+The directory contains two files, `piratebadge.html` and `piratebadge.dart`.
+</div>
+
+#### <i class="icon-anchor"> </i> Open the files.
+
+<div class="trydart-step-details" markdown="1">
+Open both files, `piratebadge.html` and `piratebadge.dart`,
+by double-clicking each filename in Dart Editor.
+</div>
+
+#### <i class="icon-anchor"> </i> Review the code.
+
+<div class="trydart-step-details" markdown="1">
+Get familiar with the HTML and the Dart code for the skeleton version of the app.
+</div>
+
+<div class="trydart-step-details" markdown="1">
+##### piratebadge.html
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details" markdown="1">
+{% prettify html%}
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Pirate badge</title>
+    <link rel="stylesheet" href="../piratebadge.css">
+  </head>
+  <body>
+    <h1>Pirate badge</h1>
+    
+    [[highlight]]<div class="widgets">[[/highlight]]
+      [[highlight]]TO DO: Put the UI widgets here.[[/highlight]]
+    [[highlight]]</div>[[/highlight]]
+    <div class="badge">
+      <div class="greeting">
+        Arrr! Me name is
+      </div>
+      <div class="name">
+        [[highlight]]<span id="badgeName"> </span>[[/highlight]]
+      </div>
+    </div>
+
+    [[highlight]]<script type="application/dart" src="piratebadge.dart"></script>[[/highlight]]
+    [[highlight]]<script src="packages/browser/dart.js"></script>[[/highlight]]
+  </body>
+</html>
+{% endprettify %}
+
+</div>
+<div class="trydart-filename">piratebadge.html</div>
+
+</div> <div class="span5" markdown="1">
+
+<i class="icon-key"> </i> <strong> Key Information </strong>
+
+* During this code lab,
+all the changes you make to `piratebadge.html` are within
+the &lt;div&gt; element identified with the class `widgets`.
+
+* In later steps,
+the &lt;span&gt; element with the ID `badgeName`
+is programmatically updated by the Dart code
+based on user input.
+
+* The `piratebadge.dart` script provides the main program for the app.
+
+* The `packages/browser/dart.js` script is a bootstrap script
+that takes care of turning on the Dart VM,
+as well as compatibility with non-Dart browsers.
+
+</div> </div>
+
+<div class="trydart-step-details" markdown="1">
+##### piratebadge.dart
+</div>
+
+<div class="row"> <div class="span7" markdown="1">
+
+<div class="trydart-step-details" markdown="1">
+{% prettify dart %}
+[[highlight]]void main() {
+  // Your app starts here.
+}
+[[/highlight]]
+{% endprettify %}
+</div>
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* This file is the main script for the app.
+It is referenced by a &lt;script&gt; tag in the `piratebadge.html` file.
+
+* The `main()` function is a top-level function.
+  Dart calls this function when your app starts.
+
+&nbsp; {% comment %} non-breaking space required for bootstrap/markdown bogosity {% endcomment %}
+</div> </div>
+
+#### <i class="icon-anchor"> </i> Run the app.
+
+<div class="trydart-step-details" markdown="1">
+To run the app in Dart Editor, select `piratebadge.html`
+and click the Run button
+<img src="images/run.png" width="16" height="16"
+     alt="Run button">.
+
+![Click the run button](images/clickrun.png)
+
+You should see a TO DO comment on the left
+and a red and white name badge on the right.
+</div>
+
+<div class="trydart-step-details" markdown="1">
+<iframe class="running-app-frame"
+        style="height:220px;width:530px;"
+        src="examples/1-blankbadge/piratebadge.html">
+</iframe>
+</div>
+
+<hr>
+
+##Step 2: Add an input field {#step-two}
+
+<div class="trydart-note" markdown="1">
+<strong>Note:</strong> Throughout this code lab,
+continue to edit the files in `1-blankbadge`.
+You can use the files in the other directories to compare to your code
+or to recover if you get off track.
+</div>
+
+In this step, you add an input field to the app.
+As the user types into the text field,
+the Dart code updates the badge from the value of the text field.
+
+#### <i class="icon-anchor"> </i> Edit piratebadge.html.
+
+<div class="row"> <div class="span7" markdown="1">
+
+<div class="trydart-step-details" markdown="1">
+
+Add the &lt;input&gt; tag to the HTML code
+within the `widgets` &lt;div&gt;.
+
+{% prettify html %}
+...
+<div class="widgets">
+[[highlight]]  <div>
+    <input type="text" id="inputName" maxlength="15">
+  </div>[[/highlight]]
+</div>
+...
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.html</div>
+
+</div> <div class="span5" markdown="1">
+
+<i class="icon-key"> </i> <strong> Key Information </strong>
+
+* The ID for the input element is `inputName`.
+Dart uses CSS selectors, like this ID,
+to get elements from the DOM.
+
+&nbsp; {% comment %} non-breaking space required for bootstrap/markdown bogosity {% endcomment %}
+
+</div> </div>
+
+#### <i class="icon-anchor"> </i> Edit piratebadge.dart.
+
+<div class="trydart-step-details" markdown="1">
+
+Import the `dart:html`
+library at the top of the file
+(below the copyright).
+
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details" markdown="1">
+
+{% prettify dart %}
+[[highlight]]import 'dart:html';[[/highlight]]
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* This imports all classes and other resources from dart:html,
+which provides HTML elements and access to the DOM.
+
+* Dart Editor helpfully warns you that the import is unused.
+Don't worry about it. You'll fix it in the next step.
+
+</div> </div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Register a function to handle input events on the input field.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details" markdown="1">
+
+{% prettify dart %}
+void main() {
+  [[highlight]]querySelector('#inputName').onInput.listen(updateBadge);[[/highlight]]
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* The `querySelector()` function, defined in
+dart:html, gets an element from the DOM.
+Here, the code uses the ID `#inputName`
+to specify the input field.
+
+* `onInput` registers an event handler for input events.
+
+* An input event occurs when the user presses a key.
+
+* You can use either single or double quotes to create a string.
+
+* Dart Editor warns you that the function doesn't exist.
+Let's fix that now.
+
+</div> </div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Implement the event handler as a top-level function.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details" markdown="1">
+
+{% prettify dart %}
+...
+
+[[highlight]]void updateBadge(Event e) { 
+  querySelector('#badgeName').text = (e.target as InputElement).value;
+}[[/highlight]]
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* This function sets the text of the `badgeName` element from the value of the input field.
+
+* You can tell that `updateBadge()` is an event handler because it takes an
+`Event` object.
+
+* The element that generated the event, the input field, is `e.target`.
+
+* The `as` keyword typecasts `e.target` to an
+`InputElement`.
+
+&nbsp; {% comment %} non-breaking space required for bootstrap/markdown bogosity {% endcomment %}
+
+</div> </div>
+
+#### <i class="icon-anchor"> </i> Run the app.
+
+<div class="trydart-step-details" markdown="1">
+
+Save your files with **File > Save All**.
+
+Use the Run button
+<img src="images/run.png" width="16" height="16"
+     alt="Run button">
+in Dart Editor to run the app.
+
+Compare your app to the one running below.
+
+Type in the input field.
+
+<iframe class="running-app-frame"
+        style="height:220px;width:530px;"
+        src="examples/2-inputnamebadge/piratebadge.html">
+</iframe>
+
+##### Problems?
+
+Check your code against the files in `2-inputbadge`.
+
+* [piratebadge.html](https://github.com/dart-lang/one-hour-codelab/blob/master/web/2-inputnamebadge/piratebadge.html)
+
+* [piratebadge.dart](https://github.com/dart-lang/one-hour-codelab/blob/master/web/2-inputnamebadge/piratebadge.dart)
+</div>
+
+
+<hr> 
+
+##Step 3: Add a button {#step-three}
+
+In this step, you add a button to the app.
+The button is enabled when the text field contains no text.
+When the user clicks the button,
+the app puts the name `Anne Bonney` on the badge.
+
+#### <i class="icon-anchor"> </i> Edit piratebadge.html.
+
+<div class="trydart-step-details" markdown="1">
+Add the &lt;button&gt; tag below the input field.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify html %}
+...
+<div class="widgets">
+  <div>
+    <input type="text" id="inputName" maxlength="15">
+  </div>
+[[highlight]]  <div>
+    <button id="generateButton">Aye! Gimme a name!</button>
+  </div>[[/highlight]]
+</div>
+...
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.html</div>
+
+</div> <div class="span5" markdown="1">
+
+<i class="icon-key"> </i> <strong> Key Information </strong>
+
+* The button has the ID `generateButton` so
+the Dart code can get the element.
+
+</div> </div>
+
+#### <i class="icon-anchor"> </i> Edit piragebadge.dart.
+
+<div class="trydart-step-details" markdown="1">
+Below the import, declare a top-level variable to hold the `ButtonElement`.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+import 'dart:html';
+
+[[highlight]]ButtonElement genButton;[[/highlight]]
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* Top-level variables are names at the library level.
+
+* ButtonElement is one of many different kinds of DOM elements
+provided by the dart:html library.
+
+&nbsp; {% comment %} non-breaking space required for bootstrap/markdown bogosity {% endcomment %}
+
+</div> </div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Wire up the button with an event handler.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+void main() {
+  querySelector('#inputName').onInput.listen(updateBadge);
+  [[highlight]]genButton = querySelector('#generateButton');
+  genButton.onClick.listen(generateBadge);[[/highlight]]
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* `onClick` registers a mouse click handler.
+
+&nbsp; {% comment %} non-breaking space required for bootstrap/markdown bogosity {% endcomment %}
+
+</div> </div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Add a top-level function that changes the name on the badge.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+...
+
+[[highlight]]void setBadgeName(String newName) {
+  querySelector('#badgeName').text = newName;
+} [[/highlight]]
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* The function updates the HTML page with a new name.
+
+&nbsp; {% comment %} non-breaking space required for bootstrap/markdown bogosity {% endcomment %}
+
+</div> </div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Implement the click handler for the button.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+...
+
+[[highlight]]void generateBadge(Event e) {
+  setBadgeName('Anne Bonney');
+}[[/highlight]]
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* This function sets the badge name to `Anne Bonney`.
+
+&nbsp; {% comment %} non-breaking space required for bootstrap/markdown bogosity {% endcomment %}
+
+</div> </div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+Modify `updateBadge()` to call `setBadgeName()`.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+void updateBadge(Event e) {
+[[highlight]]  String inputName = [[/highlight]](e.target as InputElement).value;
+[[highlight]]  setBadgeName(inputName);[[/highlight]]
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* Assign the input field's value to a local string.
+
+</div></div>
+
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Now add code to `updateBadge()` to enable and disable the button as needed.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+void updateBadge(Event e) {
+  String inputName = (e.target as InputElement).value;
+  setBadgeName(inputName);
+[[highlight]]  if (inputName.trim().isEmpty) {
+    genButton..disabled = false
+             ..text = 'Aye! Gimme a name!';
+  } else {
+    genButton..disabled = true
+             ..text = 'Arrr! Write yer name!';
+  }[[/highlight]]
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* The `String` class has useful functions and properties for dealing with strings,
+such as `trim()` and `isEmpty`.
+
+* String comes from the `dart:core` library,
+which is automatically imported into every Dart program.
+
+* The cascade operator (`..`) allows you to perform multiple
+operations on the members of a single object. 
+
+* Dart has common programming language constructs like `if`-`else`.
+
+</div></div>
+
+#### <i class="icon-anchor"> </i> Run the app.
+
+<div class="trydart-step-details" markdown="1">
+
+Save your files with **File > Save All**.
+
+Use the Run button
+<img src="images/run.png" width="16" height="16"
+     alt="Run button">
+in Dart Editor to run the app.
+
+Compare your app to the one running below.
+
+Type in the input field.
+Remove the text from the input field.
+Click the button.
+
+<iframe class="running-app-frame"
+        style="height:220px;width:530px;"
+        src="examples/3-buttonbadge/piratebadge.html">
+</iframe>
+
+
+##### Problems?
+
+Check your code against the files in `3-buttonbadge`.
+
+* [piratebadge.html](https://github.com/dart-lang/one-hour-codelab/blob/master/web/3-buttonbadge/piratebadge.html)
+
+* [piratebadge.dart](https://github.com/dart-lang/one-hour-codelab/blob/master/web/3-buttonbadge/piratebadge.dart)
+
+</div>
+
+
+<hr>
+
+##Step 4: Create a PirateName class {#step-four}
+
+In this step, you change only the Dart code.
+You create a class to represent a pirate name.
+When created, an instance of this class
+randomly selects a name and appellation from a list,
+or optionally you can provide a name
+and an appellation to the constructor.
+
+#### <i class="icon-anchor"> </i> Edit piratebadge.dart.
+
+<div class="trydart-step-details" markdown="1">
+Add an import to the top of the file.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+import 'dart:html';
+
+[[highlight]]import 'dart:math' show Random;[[/highlight]]
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+<i class="icon-key"> </i> <strong> Key Information </strong>
+
+* Using the `show` keyword,
+you can import only the classes, functions, or properties you need.
+
+* `Random` provides a random number generator.
+
+</div></div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Add a class declaration to the bottom of the file.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+...
+
+[[highlight]]class PirateName {
+}[[/highlight]]
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* The class declaration provides the class name.
+
+</div></div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Create a class-level Random object.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+class PirateName {
+  [[highlight]]static final Random indexGen = new Random();[[/highlight]]
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* `static` defines a class-level field. That is,
+the random number generator is shared with all
+instances of this class.
+
+* Dart Editor italicizes static names.
+
+* Use `new` to call a constructor.
+
+</div></div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Add two instance variables to class,
+one for the first name and one for the appellation.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+class PirateName {
+  static final Random indexGen = new Random();
+[[highlight]]  String _firstName;
+  String _appellation;[[/highlight]]
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* Private variables start with underscore (`_`).
+
+</div></div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Create two static lists within the class
+that provide a small collection of names and appellations to choose from.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+class PirateName {
+  ...
+[[highlight]]  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'];[[/highlight]]
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* `final` variables cannot change.
+
+* Lists are built into the language.
+These lists are created using list literals.
+
+* The `List` class provides the API for lists.
+
+</div></div>
+
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Provide a constructor for the class.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+class PirateName {
+  ...
+[[highlight]]  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;
+    }
+  }[[/highlight]]
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* Constructors have the same name as the class.
+
+* The parameters enclosed in curly brackets (`{` and `}`)
+are optional, named parameters.
+
+* The `nextInt()` function gets a new random integer
+from the random number generator.
+
+* Use square brackets (`[` and `]`) to index into a list.
+
+* The `length` property returns the number of items in a list.
+
+* The code uses a random number as an index into the list.
+
+</div> </div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Provide a getter for the pirate name.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+class PirateName {
+  ...
+[[highlight]]  String get pirateName =>
+    _firstName.isEmpty ? '' : '$_firstName the $_appellation';[[/highlight]]
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div><div class="span5" markdown="1">
+
+* Getters are special methods that provide read access to an object’s properties.
+
+* The ternary operator `?:` is short-hand for an if-then-else statement.
+
+* String interpolation
+(`'$_firstName the $_appellation'`)
+lets you easily build strings from other objects.
+
+* The fat arrow (` => expr; `) syntax is a shorthand for `{ return expr; }`.
+
+</div></div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Modify the function `setBadgeName()` to use a PirateName instead of a String:
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+void setBadgeName([[highlight]]PirateName[[/highlight]] newName) {
+  querySelector('#badgeName').text = newName[[highlight]].pirateName[[/highlight]];
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div><div class="span5" markdown="1">
+
+* This code calls the getter to get the PirateName as a string.
+
+</div></div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Change `updateBadge()` to generate a PirateName based on the input field value.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+void updateBadge(Event e) {
+  String inputName = (e.target as InputElement).value;
+  
+  [[highlight]]setBadgeName(new PirateName(firstName: inputName));[[/highlight]]
+  ...
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div><div class="span5" markdown="1">
+
+* The call to the constructor provides a value for one optional named parameter.
+
+</div></div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Change `generateBadge()` to generate a PirateName instead of using `Anne Bonney`.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+void generateBadge(Event e) {
+  setBadgeName([[highlight]]new PirateName()[[/highlight]]);
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div><div class="span5" markdown="1">
+
+* In this case, the call to the constructor passes no parameters.
+
+</div></div>
+
+#### <i class="icon-anchor"> </i> Run the app.
+
+<div class="trydart-step-details" markdown="1">
+  
+Save your files with **File > Save All**.
+
+Use the Run button
+<img src="images/run.png" width="16" height="16"
+     alt="Run button">
+in Dart Editor to run the app.
+
+Compare your app to the one running below.
+
+Type in the input field.
+Remove the text from the input field.
+Click the button.
+
+<iframe class="running-app-frame"
+        style="height:220px;width:530px;"
+        src="examples/4-classbadge/piratebadge.html">
+</iframe>
+
+
+##### Problems?
+
+Check your code against the files in `4-classbadge`.
+
+* [piratebadge.html](https://github.com/dart-lang/one-hour-codelab/blob/master/web/4-classbadge/piratebadge.html)
+
+* [piratebadge.dart](https://github.com/dart-lang/one-hour-codelab/blob/master/web/4-classbadge/piratebadge.dart)
+
+</div>
+
+
+<hr>
+
+
+##Step 5: Save to local storage {#step-five}
+
+In this step, you give the app some persistence
+by saving the badge name to local storage each time it changes.
+When you restart the app,
+it initializes the badge from the saved name.
+
+#### <i class="icon-anchor"> </i> Edit piratebadge.dart.
+
+<div class="trydart-step-details" markdown="1">
+Import the JSON converter from the `dart:convert` library.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+import 'dart:html';
+import 'dart:math' show Random;
+[[highlight]]
+import 'dart:convert' show JSON;[[/highlight]]
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+<i class="icon-key"> </i> <strong> Key Information </strong>
+
+* `JSON` provides convenient access to the most common JSON use cases.
+
+</div> </div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Add a named constructor to the PirateName class.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+class PirateName {
+  ...
+[[highlight]]  PirateName.fromJSON(String jsonString) {
+    Map storedName = JSON.decode(jsonString);
+    _firstName = storedName['f'];
+    _appellation = storedName['a'];
+  }[[/highlight]]
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* The constructor creates a new PirateName instance from a JSON-encoded string.
+
+* `PirateName.fromJson` is a named constructor.
+
+* `JSON.decode()` parses a JSON string and creates Dart objects from it.
+
+* The pirate name is decoded into a `Map` object.
+
+</div> </div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Add a getter to the PirateName class
+that encodes a pirate name in a JSON string.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+class PirateName {
+  ...
+  [[highlight]]String get jsonString => '{ "f": "$_firstName", "a": "$_appellation" } ';[[/highlight]]
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* The getter formats the JSON string using the map format.
+
+</div> </div>
+
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Declare a top-level string.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+[[highlight]]final String TREASURE_KEY = 'pirateName';[[/highlight]]
+
+void main() {
+  ...
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* This string is a key to the local storage.
+
+</div> </div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Save the pirate name when the badge name changes.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+void setBadgeName(PirateName newName) {
+  [[highlight]]if (newName == null) {
+    return;
+  }[[/highlight]]
+  querySelector('#badgeName').text = newName.pirateName;
+  [[highlight]]window.localStorage[TREASURE_KEY] = newName.jsonString;[[/highlight]]
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* Local storage is provided by the browser's `Window`.
+
+&nbsp; {% comment %} non-breaking space required for bootstrap/markdown bogosity {% endcomment %}
+
+</div> </div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Add a top-level function called `getBadgeNameFromStorage()`.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+void setBadgeName(PirateName newName) {
+  ...
+}
+
+[[highlight]]PirateName getBadgeNameFromStorage() {
+  String storedName = window.localStorage[TREASURE_KEY];
+  if (storedName != null) {
+    return new PirateName.fromJSON(storedName);
+  } else {
+    return null;
+  }
+}[[/highlight]]
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* The function retrieves the pirate name from local storage
+and creates a PirateName object from it.
+
+&nbsp; {% comment %} non-breaking space required for bootstrap/markdown bogosity {% endcomment %}
+
+</div> </div>
+
+<div class="trydart-step-details" markdown="1">
+<hr>
+Call the function from the `main()` function.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+void main() {
+  ...
+  [[highlight]]setBadgeName(getBadgeNameFromStorage());[[/highlight]]
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* Initialize the badge name from local storage.
+
+&nbsp; {% comment %} non-breaking space required for bootstrap/markdown bogosity {% endcomment %}
+
+</div> </div>
+
+#### <i class="icon-anchor"> </i> Run the app.
+
+<div class="trydart-step-details" markdown="1">
+  
+Save your files with **File > Save All**.
+
+Use the Run button
+<img src="images/run.png" width="16" height="16"
+     alt="Run button">
+in Dart Editor to run the app.
+
+Compare your app to the one running below.
+
+Click the button to put a name on the badge.
+Start the app again by duplicating this window.
+
+<iframe class="running-app-frame"
+        style="height:220px;width:530px;"
+        src="examples/5-localbadge/piratebadge.html">
+</iframe>
+
+
+##### Problems?
+
+Check your code against the files in `5-localbadge`.
+
+* [piratebadge.html](https://github.com/dart-lang/one-hour-codelab/blob/master/web/5-localbadge/piratebadge.html)
+
+* [piratebadge.dart](https://github.com/dart-lang/one-hour-codelab/blob/master/web/5-localbadge/piratebadge.dart)
+
+</div>
+
+
+<hr>
+
+
+##Step 6: Read names from JSON-encoded file {#step-six}
+
+In this step, you change the PirateName class to get
+the list of names and appellations from a JSON file.
+This gives you a chance to add more names and
+appellations to the program.
+
+#### <i class="icon-anchor"> </i> Create piratenames.json.
+
+<div class="trydart-step-details" markdown="1">
+Use **File > New File...** to create a JSON-encoded file
+named `piratenames.json` with the following content.
+
+Put the file in `1-blankbadge` alongside the Dart and HTML files you've been editing.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+{ "names": [ "Anne", "Bette", "Cate", "Dawn",
+            "Elise", "Faye", "Ginger", "Harriot",
+            "Izzy", "Jane", "Kaye", "Liz",
+            "Maria", "Nell", "Olive", "Pat",
+            "Queenie", "Rae", "Sal", "Tam",
+            "Uma", "Violet", "Wilma", "Xana",
+            "Yvonne", "Zelda",
+            "Abe", "Billy", "Caleb", "Davie",
+            "Eb", "Frank", "Gabe", "House",
+            "Icarus", "Jack", "Kurt", "Larry",
+            "Mike", "Nolan", "Oliver", "Pat",
+            "Quib", "Roy", "Sal", "Tom",
+            "Ube", "Val", "Walt", "Xavier",
+            "Yvan", "Zeb"],
+  "appellations": [ "Awesome", "Black", "Captain", "Damned",
+            "Even", "Fighter", "Great", "Hearty",
+            "Irate", "Jackal", "King", "Lord",
+            "Mighty", "Noble", "Old", "Powerful",
+            "Quick", "Red", "Stalwart", "Tank",
+            "Ultimate", "Vicious", "Wily", "aXe",
+            "Young", "Zealot",
+            "Angry", "Brave", "Crazy", "Damned",
+            "Eager", "Fool", "Greedy", "Hated",
+            "Idiot", "Jinxed", "Kind", "Lame",
+            "Maimed", "Naked", "Old", "Pale",
+            "Queasy", "Rat", "Sandy", "Tired",
+            "Ugly", "Vile", "Weak", "Xeric",
+            "Yellow", "Zesty"]}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratenames.json</div>
+
+</div> <div class="span5" markdown="1">
+
+<i class="icon-key"> </i> <strong> Key Information </strong>
+
+* The file contains a JSON-encoded map,
+which contains two lists of strings.
+
+</div> </div>
+
+#### <i class="icon-anchor"> </i> Edit piratebadge.html.
+
+<div class="trydart-step-details" markdown="1">
+Disable the input field and the button.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify html %}
+...
+  <div>
+    <input type="text" id="inputName" maxlength="15" [[highlight]]disabled[[/highlight]]>
+  </div>
+  <div>
+    <button id="generateButton" [[highlight]]disabled[[/highlight]]>Aye! Gimme a name!</button>
+  </div>
+...
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.html</div>
+
+</div> <div class="span5" markdown="1">
+
+
+* The Dart code enables the text field and
+the button after the pirate names are successfully read from
+the JSON file.
+
+</div> </div>
+
+#### <i class="icon-anchor"> </i> Edit piratebadge.dart.
+
+<div class="trydart-step-details" markdown="1">
+
+Add an import to the top of the file.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+import 'dart:html';
+import 'dart:math' show Random;
+import 'dart:convert' show JSON;
+
+[[highlight]]import 'dart:async' show Future;[[/highlight]]
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* The `dart:async` library provides for asynchronous programming.
+
+* A `Future` provides a way to get a value in the future.
+
+</div> </div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+Replace the `names` and `appellations` lists with these static, empty lists:
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+class PirateName {
+  ...
+  [[highlight]]static List<String> names = [];
+  static List<String> appellations = [];[[/highlight]]
+  ...
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* Be sure to remove `final` from these declarations.
+
+* `[]` is equivalent to `new List()`.
+
+* A List is a _generic_ type&mdash;a List can contain any kind of object.
+If you intend for a list to contain only strings,
+you can declare it as `List<String>`.
+
+</div> </div>
+
+<div class="trydart-step-details" markdown="1">
+
+<hr>
+
+Add two static functions to the PirateName class:
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+class PirateName {
+  ...
+
+  [[highlight]]static Future readyThePirates() {
+    var path = 'piratenames.json';
+    return HttpRequest.getString(path)
+        .then(_parsePirateNamesFromJSON);
+  }
+  
+  static _parsePirateNamesFromJSON(String jsonString) {
+    Map pirateNames = JSON.decode(jsonString);
+    names = pirateNames['names'];
+    appellations = pirateNames['appellations'];
+  }[[/highlight]]
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* `HttpRequest` is a utility for retrieving data from a URL.
+
+* `getString()` is a convenience method for doing a simple
+GET request that returns a string.
+
+* The code uses a `Future` to perform the GET asynchronously.
+
+* The callback function for `.then()` is called when
+the Future completes successfully.
+
+* When the Future completes successfully,
+the pirate names are read from the JSON file.
+
+* `readyThePirates` returns the Future so the main program has the
+opportunity to do something after the file is read.
+
+</div> </div>
+
+<div class="trydart-step-details" markdown="1">
+<hr>
+Add a top-level variable.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+[[highlight]]SpanElement badgeNameElement;[[/highlight]]
+
+void main() {
+  ...
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* Stash the span element for repeated use instead of querying the DOM for it.
+
+</div> </div>
+
+<div class="trydart-step-details" markdown="1">
+<hr>
+Make these changes to the `main()` function.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+void main() {
+  [[highlight]]InputElement inputField = querySelector('#inputName');
+  inputElement.onInput.listen(updateBadge);[[/highlight]]
+  genButton = querySelector('#generateButton');
+  genButton.onClick.listen(generateBadge);
+  
+  [[highlight]]badgeNameElement = querySelector('#badgeName');[[/highlight]]
+  ...
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* Stash the span element in the global variable.
+Also, stash the input element in a local variable.
+
+
+</div> </div>
+
+<div class="trydart-step-details" markdown="1">
+<hr>
+Then, add the code to get the names from the JSON file,
+handling both success and failure.
+</div>
+
+<div class="row"> <div class="span7">
+
+<div class="trydart-step-details">
+{% prettify dart %}
+void main() {
+  ...
+  
+[[highlight]]  PirateName.readyThePirates()
+    .then((_) {
+      //on success
+      inputField.disabled = false; //enable
+      genButton.disabled = false;  //enable[[/highlight]]
+      setBadgeName(getBadgeNameFromStorage());
+    [[highlight]]})
+    .catchError((arrr) {
+      print('Error initializing pirate names: $arrr');
+      badgeNameElement.text = 'Arrr! No names.';
+    });[[/highlight]]
+}
+{% endprettify %}
+</div>
+
+<div class="trydart-filename">piratebadge.dart</div>
+
+</div> <div class="span5" markdown="1">
+
+* Call the `readyThePirates()` function,
+which returns a Future.
+
+* When the Future successfully completes,
+the `then()` callback function is called.
+
+* Using underscore (`_`) as a parameter name
+indicates that the parameter is ignored.
+
+* The callback function enables the UI
+and gets the stored name.
+
+* If the Future encounters an error
+the `catchError` callback function is called
+and the program displays an error message,
+leaving the UI disabled.
+
+* The callback functions for `then()` and `catchError` are defined inline.
+
+</div> </div>
+
+#### <i class="icon-anchor"> </i> Run the app.
+
+<div class="trydart-step-details" markdown="1">
+  
+Save your files with **File > Save All**.
+
+Use the Run button
+<img src="images/run.png" width="16" height="16"
+     alt="Run button">
+in Dart Editor to run the app.
+
+If you want to see what happens when the app can't find the `.json` file,
+change the file name in the code and run the program again.
+
+Compare your app to the final version running below.
+
+
+<iframe class="running-app-frame"
+        style="height:220px;width:530px;"
+        src="examples/6-piratebadge_json/piratebadge.html">
+</iframe>
+
+
+##### Problems?
+
+Check your code against the files in `6-piratebadge_json`.
+
+* [piratebadge.html](https://github.com/dart-lang/one-hour-codelab/blob/master/web/6-piratebadge_json/piratebadge.html)
+
+* [piratebadge.dart](https://github.com/dart-lang/one-hour-codelab/blob/master/web/6-piratebadge_json/piratebadge.dart)
+
+</div>
+
+{% comment %}
+
+#### <i class="icon-anchor"> </i> Share your pirate name.
+
+<div class="trydart-step-details" markdown="1">
+
+Congratulations! You finished the pirate badge code lab.
+
+
+Share your pirate name with the world.
+
+<p class="share-button twitter">
+<a href="https://twitter.com/share"
+   class="twitter-share-button external-link"
+   data-count="none"
+   data-text="Arrr! I've generated me pirate name and learnt Dart, to boot. http://dartlang.org/darrrt"
+   data-hashtags="dartlang">Tweet</a>
+ </p>
+
+<script src="https://apis.google.com/js/plusone.js"></script>
+<g:plus action="share"></g:plus>
+
+</div>
+{% endcomment %}
+
+
+<hr>
+
+##Step 7: Go forth and learn more about Dart {#step-seven}
+
+#### <i class="icon-anchor"> </i> Think about what you've done!
+
+<div class="trydart-step-details" markdown="1">
+
+This code lab provided a tour of most Dart language features
+and many library features.
+Here's where to go to learn more.
+
+##### The Dart language
+
+<a href="https://www.dartlang.org/docs/dart-up-and-running/contents/ch02.html">
+A Tour of the Dart Language</a>
+shows you how to use each major Dart feature,
+from variables and operators to classes and libraries.
+This code lab introduced the following Dart language features,
+all of which are covered in more detail in the language tour.
+
+* string interpolation (`'$_firstName the $_appellation'`)
+* the cascade operator (`..`)
+* the fat arrow (`=>`) function syntax
+* the ternary operator (`?:`)
+* named constructors (`PirateName.fromJSON(...)`)
+* optional parameters
+* a class
+* getters
+* instance methods and fields
+* class level methods and fields
+* top-level variables and functions
+* typecasting with `as` (`(e.target as InputElement)`)
+* import, and import with `show` (`import 'dart:math' show Random;`)
+* generics
+
+##### The Dart libraries
+
+<a href="https://www.dartlang.org/docs/dart-up-and-running/contents/ch03.html">
+A Tour of the Dart Libraries</a>
+shows you how to use the major features in Dart’s libraries.
+
+##### API documentation for classes
+
+<a href="https://api.dartlang.org/dart_core/String.html" target="_blank">String</a>,
+<a href="https://api.dartlang.org/dart_core/List.html" target="_blank">List</a>,
+<a href="https://api.dartlang.org/dart_core/Map.html" target="_blank">Map</a>,
+<a href="https://api.dartlang.org/dart_math/Random.html" target="_blank">Random</a>,
+<a href="https://api.dartlang.org/dart_html/InputElement.html" target="_blank">InputElement</a>,
+<a href="https://api.dartlang.org/dart_html/ButtonElement.html" target="_blank">ButtonElement</a>,
+<a href="https://api.dartlang.org/dart_html/Event.html" target="_blank">Event</a>,
+<a href="https://api.dartlang.org/dart_html/HttpRequest.html" target="_blank">HttpRequest</a>, and
+<a href="https://api.dartlang.org/dart_async/Future.html" target="_blank">Future</a>
+
+##### API documentation for libraries
+
+<a href="https://api.dartlang.org/dart_core.html" target="_blank">dart:core</a>,
+<a href="https://api.dartlang.org/dart_math.html" target="_blank">dart:math</a>,
+<a href="https://api.dartlang.org/dart_html.html" target="_blank">dart:html</a>,
+<a href="https://api.dartlang.org/dart_async.html" target="_blank">dart:async</a>, and
+<a href="https://api.dartlang.org/dart_convert.html" target="_blank">dart:convert</a>
+
+##### API documentation for JSON and local storage
+
+<a href="https://api.dartlang.org/dart_html/Window.html#localStorage" target="_blank">LocalStorage</a>, and
+<a href="https://api.dartlang.org/dart_convert.html#JSON" target="_blank">JSON</a>
+
+
+</div>
+
+#### <i class="icon-anchor"> </i> Check out the samples.
+
+<div class="trydart-step-details" markdown="1">
+
+Run some Dart programs online and check out the source code
+on our [Samples page](/samples/).
+</div>
+
+#### <i class="icon-anchor"> </i> Read the tutorials.
+
+<div class="trydart-step-details" markdown="1">
+Learn more about Dart from
+the [Dart tutorials](/docs/tutorials/).
+</div>
+