In a React Native app, there are typically three to four main threads that handle different aspects of the application's execution:
UI Thread (Main Thread): This is the primary thread responsible for rendering the user interface. It handles native UI rendering tasks such as measuring, layout, and drawing events on both Android and iOS platforms. This thread is crucial for maintaining a responsive UI and is often referred to as the main thread[1][2][5].
JavaScript Thread (JS Thread): This thread executes the JavaScript code, including the React logic and business logic of the application. It processes user interactions, API calls, and updates to the DOM hierarchy. The JS thread sends batched updates to the UI thread to reflect changes in the UI[1][2][5].
Native Modules Thread: This thread is used when the app needs to access platform-specific APIs. For example, it handles tasks like animations that require native ...
