d a look in the editor, you'll have noticed that users can define _data sources_ - these are URLs of public JSON data. This data is automatically fetched, and put into the **data** object, which is made available in code samples.

            The **joelotter** data source is my GitHub repository information. Let's get the names of my repositories.

            ```javascript; runnable
            return data.joelotter.map(function(repo) {
                return repo.name;
            });
            ```

   