David Mohl presented on React Native, a framework for developing native iOS applications using React. Some key points: - React Native allows building native iOS apps using React and JavaScript instead of Swift, while reusing code across iOS and Android. - It is not a webview, cross-compiler, or solution for "write once, run everywhere". Apps built with React Native are fully native and can access the same APIs and capabilities as apps built using Swift. - Rapid development is enabled through reloading code changes instantly using Hot Reloading. Functional programming principles and reusable components also improve development speed.