We're at the final chapter of the book and it's time to roll up our sleeves and develop a complete application with Dart using everything we've learned. In this chapter we're going to develop a Dart web application using the Polymer library, Google Maps, and IndexedDb. With these tools we're going to develop an application to manage your contacts. We're going to use some classes we developed in previous chapters such as the idbContacts class developed in Chapter 23. In this final chapter we want you to use everything you know about Dart so we're going to use asynchronous programming, Future objects, abstract classes, maps, polymer, and other pub packages. Now, let's merge all this knowledge and see how we can create a practical Dart web application.