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-@ngdoc overview
-@name Tutorial: 9 - Filters
-@description
-
-<ul doc:tutorial-nav="9"></ul>
-
-
-In this step you will learn how to create your own custom display filter.
-
-
-<doc:tutorial-instructions step="9"></doc:tutorial-instructions>
-
-
-Navigate to one of the detail pages.
-
-In the previous step, the details page displayed either "true" or "false" to indicate whether
-certain phone features were present or not. We have used a custom filter to convert those text
-strings into glyphs: ✓ for "true", and ✘ for "false". Let's see, what the filter code looks like.
-
-The most important changes are listed below. You can see the full diff on {@link
-https://github.com/angular/angular-phonecat/compare/step-8...step-9
-GitHub}:
-
-
-## Custom Filter
-
-In order to create a new filter, simply register your custom filter function with the {@link
-api/angular.module.ng.$filter `angular.module.ng.$filter`} API.
-
-__`app/js/filters.js`:__
-<pre>
-angular.module.ng.$filter('checkmark', function(input) {
-  return input ? '\u2713' : '\u2718';
-});
-</pre>
-
-The name of our filter is "checkmark". The `input` evaluates to either `true` or `false`, and we
-return one of two unicode characters we have chosen to represent true or false (`\u2713` and
-`\u2718`).
-
-
-## Template
-
-Since the filter code lives in the `app/js/filters.js` file, we need to include this file in our
-layout template.
-
-__`app/index.html`:__
-<pre>
-...
- <script src="js/controllers.js"></script>
- <script src="js/filters.js"></script>
-...
-</pre>
-
-The syntax for using filters in angular templates is as follows:
-
-    {{ expression | filter }}
-
-Let's employ the filter in the phone details template:
-
-
-
-__`app/partials/phone-detail.html`:__
-<pre>
-...
-    <dl>
-      <dt>Infrared</dt>
-      <dd>{{phone.connectivity.infrared | checkmark}}</dd>
-      <dt>GPS</dt>
-      <dd>{{phone.connectivity.gps | checkmark}}</dd>
-    </dl>
-...
-</pre>
-
-
-## Test
-
-Filters, like any other component, should be tested and these tests are very easy to write.
-
-__`test/unit/filtersSpec.js`:__
-<pre>
-describe('checkmark filter', function() {
-
-  it('should convert boolean values to unicode checkmark or cross', function() {
-    expect(angular.module.ng.$filter.checkmark(true)).toBe('\u2713');
-    expect(angular.module.ng.$filter.checkmark(false)).toBe('\u2718');
-  });
-})
-</pre>
-
-To run the unit tests, execute the `./scripts/test.sh` script and you should see the following
-output.
-
-        Chrome: Runner reset.
-        ....
-        Total 4 tests (Passed: 4; Fails: 0; Errors: 0) (3.00 ms)
-          Chrome 11.0.696.57 Mac OS: Run 4 tests (Passed: 4; Fails: 0; Errors 0) (3.00 ms)
-
-
-# Experiments
-
-* Let's experiment with some of the {@link api/angular.module.ng.$filter built-in angular filters} and add the
-following bindings to `index.html`:
-  * `{{ "lower cap string" | uppercase }}`
-  * `{{ {foo: "bar", baz: 23} | json }}`
-  * `{{ 1304375948024 | date }}`
-  * `{{ 1304375948024 | date:"MM/dd/yyyy @ h:mma" }}`
-
-*  We can also create a model with an input element, and combine it with a filtered binding. Add
-the following to index.html:
-
-        <input ng:model="userInput"> Uppercased: {{ userInput | uppercase }}
-
-
-# Summary
-
-Now that you have learned how to write and test a custom filter, go to {@link step_10 step 10} to
-learn how we can use angular to enhance the phone details page further.
-
-
-<ul doc:tutorial-nav="9"></ul>