React Native’s new architecture was still considered experimental and not yet fully stable for production use. However, the React Native team had been actively working on improving and refining this new architecture, with the goal of eventually making it the default architecture for React Native projects.
You can migrate your existing React Native project to the new architecture. However, migrating to the new architecture can require some changes to your existing codebase and project structure. The migration process may also involve updating dependencies, modifying native code, and adjusting your project’s build process.
In React Native, there are typically three threads that are used to manage the different aspects of the application:
In addition to these threads, React Native also uses a “shadow thread” to manage the UI component hierarchy. This thread is used to calculate the layout and size of UI components and to manage the rendering of changes to the UI.
The way that these threads work together in a React Native application is as follows:
The UI thread handles user input and updates to the UI components. When the user interacts with a component, such as by tapping a button, this thread receives the input and triggers the appropriate action.
The shadow thread sends a message back to the UI thread with the updated layout information, which triggers a redraw of the component on the screen.
Fabric is a re-architecture of the React Native framework that is designed to improve performance, stability, and reliability. It is a lightweight, optimized, and extensible framework that enables high-performance layout and rendering of native UI components.
TurboModules is a module system for React Native that replaces the legacy NativeModules system. TurboModules are pre-compiled native modules that can be loaded and executed more quickly than legacy NativeModules.
Performance: V8 is known for its high performance and is used in a variety of applications, including Google Chrome. Hermes, on the other hand, is designed specifically for mobile app development and is optimized for React Native.
Memory usage: Hermes is designed to minimize memory usage in mobile apps, which is crucial for devices with limited memory resources. V8 is more flexible in terms of memory usage, but may not be as optimized for mobile devices as Hermes.
Start-up time: Hermes has a faster start-up time compared to V8, which is important for mobile apps that need to launch quickly and provide a seamless user experience.
Garbage collection: V8 uses a generational garbage collector, while Hermes uses a concurrent garbage collector. Both approaches have their advantages and disadvantages, but the key difference is that V8’s approach may be more optimized for long-running server applications, while Hermes’ approach may be more optimized for mobile app development.
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