Heard of NativeScript? Carl and Richard talk to Sam Basu from Telerik about NativeScript, a dev stack using JavaScript to build native mobile applications. Sam describes how NativeScript is different from Cordova, since it doesn't use HTML or a runtime that essentially hosts a browser - instead it has a custom UI markup language that is rather similar to XAML and compiles into native code on iOS and Android (Windows Phone coming soon). So if you like working in Javascript but want native performance, you should take a look at NativeScript!
