In December 2018, Google announced that Flutter version 1.0, its open source framework/toolkit for developing mobile apps for both iOS and Android devices, was now officially available. During the time that Flutter was in beta development, a number of companies, including Alibaba, Groupon, Tencent, and others, used it, as well as the developers of the Hamilton app, as discussed in the second video. Flutter is based on Dart, Google's in-house programming language and also uses a number of other Google technologies and ideas, including Google Material Design, its design language, and a rendering engine based on the Skia Graphics Library, used by Chrome. Google believes that Flutter will help developers overcome the traditional limitations of crossplatform approaches by enabling a "code once" environment. By using Google's Material Design and an extensive widget catalog, Flutter enables developers to easily create user interfaces that match the design and brand experience desired for the mobile app. There are a number of other crossplatform development environments available for mobile apps, including Microsoft's Xamarin, Facebook's React Native, Corona SKD, JQuery Mobile, and Iconic, among others. Case Questions: 1-How is Flutter able to be used to create native applications for both iOS and Android devices? 2-What does stateful "hot reload" functionality allow? 3-Why did Hamilton's producers create a mobile app? 4-How long did it take to develop the Hamilton app 5-What is some of the functionality offered by the app? 6-What were some of the advantages to using Flutter