Earlier in this book, I introduced the notion of a render target—the thing that React components render to. The render target is abstract as far as the React programmer is concerned. For example, in React, the render target can be a string or it could be the Document Object Model (DOM). This is why your components never directly interface with the render target, because you can never make assumptions about where the rendering is taking place.
A mobile platform has UI widget libraries that developers can leverage to build apps for that platform. On Android, developers implement Java apps, while, on iOS, developers implement Swift apps. If you want a functional mobile app, you're going to have to pick one. However, you'll need to learn both languages, as supporting only one of two major platforms isn't realistic for success.
For React developers, this isn't a problem. The same React components that you build work all over the place, even...
