Introduction to React Native: What You Need to Know

React Native turned 10 years old recently. A decade ago, the idea of writing JavaScript to build native mobile apps seemed crazy to a lot of developers. Now it powers apps for Facebook, Instagram, Shopify, Discord, and thousands of others.

If you're evaluating React Native for your project, here's what you actually need to know. Not the marketing pitch, but the real deal.

What React Native Actually Is

React Native lets you write mobile apps using JavaScript and React. But unlike hybrid frameworks that run a web view, React Native renders actual native components. When you create a button in React Native, the user sees a real iOS button or Android button, not an HTML element styled to look like one.

This matters for performance and feel. Users can tell when an app isn't quite native, even if they can't articulate why. React Native mostly avoids that uncanny valley.

The code you write looks like React for the web:

const App = () => ( <View style={styles.container}> <Text>Hello, World!</Text> <Button title="Press me" onPress={handlePress} /> </View> );

If you know React, you're already halfway there. The components are different (View instead of div, Text instead of span), but the mental model is identical.

The Architecture (Briefly)

React Native has gone through a major architecture overhaul in the last few years. The new architecture (Fabric and TurboModules) addresses many historical pain points.

The old system had a "bridge" between JavaScript and native code that caused performance bottlenecks, especially for complex animations and heavy interactions. The new architecture uses a more direct communication method that's significantly faster.

You don't need to understand the internals deeply, but know that if someone complains about React Native performance from 2019-era experience, they're outdated.

What React Native Does Well

Developer Experience

Hot reloading works beautifully. Make a change, see it instantly. No waiting for compilation. This alone makes development significantly faster than traditional native development.

Code Sharing

One codebase for iOS and Android. Typically 85-95% code sharing is achievable. Some platform-specific code is usually needed, but it's manageable.

If you also have a React web app, you can share logic and sometimes even components across web and mobile. That's a huge efficiency gain.

The Ecosystem

npm has packages for almost everything. Navigation, state management, API clients, UI component libraries. You won't build most things from scratch.

Popular libraries like React Navigation, Redux/Zustand, and React Query work great. The ecosystem is mature.

Hiring

JavaScript developers are everywhere. React developers are everywhere. React Native developers are easier to find than Swift/Kotlin specialists. This matters for long-term maintenance.

What React Native Struggles With

Complex Animations

Basic animations are fine. But if you're building something with lots of gesture-driven, physics-based animations, you'll hit limits. You can solve this with native modules, but that adds complexity.

Heavy Computation

JavaScript isn't as fast as native code for CPU-intensive tasks. Image processing, complex calculations, anything that needs raw performance. These might need native implementations.

Bleeding Edge Platform Features

When Apple or Google releases new APIs, React Native support lags. If you need the latest iOS 18 feature on day one, you might be writing native code.

Large App Bundles

React Native apps are typically larger than pure native apps. For most apps this doesn't matter, but if minimizing download size is critical, it's worth considering.

When to Choose React Native

React Native is a great fit when:

• You have a React web team that can expand to mobile
• You need to support iOS and Android simultaneously
• Your app is primarily data-driven (forms, lists, API calls)
• Time to market matters more than absolute performance
• Budget constraints require efficiency

When to Choose Native

Go native (Swift/Kotlin) when:

• Performance is absolutely critical (games, video editing)
• You need deep platform integration
• Your team already has strong native expertise
• You're building for only one platform
• The app involves complex graphics or AR/VR

Getting Started

If you want to try React Native, the quickest path is Expo. Expo wraps React Native with additional tooling that makes development much smoother, especially for beginners.

npx create-expo-app MyApp cd MyApp npx expo start

That's it. You'll have a running app in minutes. Expo handles the build process, signing, and deployment complexity that makes raw React Native setup painful.

For production apps, we usually start with Expo and "eject" to bare React Native only if we need custom native modules that Expo doesn't support. This happens less often than you'd think.

The Learning Path

If you're coming from React web development:

• Learn the core components (View, Text, Image, ScrollView, FlatList)
• Understand Flexbox layout (it's slightly different from web)
• Get comfortable with React Navigation for screens
• Learn platform-specific patterns (safe areas, keyboard handling)

If you're new to React entirely, learn React fundamentals first. The mobile-specific parts are much easier once you understand hooks, components, and state management.

The Bottom Line

React Native isn't perfect, but it's a genuinely good option for many apps. The "it's not truly native" criticism from years ago is largely outdated. Modern React Native apps can be indistinguishable from native apps for most use cases.

At LXGIC, we use React Native for probably 60% of our mobile projects. It's not the right tool for everything, but it's the right tool for a lot of things.