gistfile1.js

// Creates a Person model which has a `name` attribute.
Y.Person = Y.Base.create('person', Y.Model, [], {}, {
    ATTRS: {
        name: {}
    }
});

// Creates a HelloView which can say hello to a Person, or to the World if a
// Person model is not specified.
Y.HelloView = Y.Base.create('helloView', Y.View, [], {
    render: function () {
        var person = this.get('model'),
            name   = person && person.get('name');

        this.get('container').set('text', 'Hello ' + (name || 'World') + '!');
        return this;
    }
});

// Creates a new App instance and registers the HelloView.
var app = new Y.App({
    views: {
        hello: {type: 'HelloView'}
    }
});

// Adds a route handler for "/" to show the HelloView.
app.route('/', function (req) {
    this.showView('hello');
});

// Adds a route handler for "/:name" to show the HelloView with a Person model.
app.route('/:name', function (req) {
    this.showView('hello', {
        model: new Y.Person(req.params)
    });
});

// Renders the app, then saves a new history entry for "/ericf" which will
// dispatch the "/:name" route handler.
app.render().save('/ericf');