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React Native · Question Set
Advanced Architecture & New Architecture interview questions for placements and exams.
Questions
14
Included in this set
Subject
React Native
Explore more sets
Difficulty
Mixed
Level of this set
Go through each question and its explanation. Use this set as a focused practice pack for React Native.
Unlike the old bridge, which passed data asynchronously using JSON messages, JSI allows direct, synchronous function calls between JavaScript and native code. This drastically improves speed and reduces message overhead.
For complete preparation, combine this set with full subject-wise practice for React Native. You can also explore other subjects and sets from the links below.
Fabric is React Native’s new rendering layer that replaces the old UIManager. It makes rendering faster and more consistent by synchronizing React Fiber and native UI updates directly through JSI.
TurboModules use JSI to directly call native functions synchronously. This makes data exchange between JS and native modules faster and more memory-efficient compared to the old bridge system.
Fabric supports React 18’s concurrent rendering mode, allowing the UI to remain responsive even during heavy updates. It helps React Native manage priorities and smoothly render partial updates.
React Native’s new architecture uses a shared C++ core that connects JavaScript and native code. It ensures consistent performance and reduces duplication between Android and iOS implementations.
Hermes is a lightweight JS engine that compiles code ahead of time and integrates directly with JSI. It’s optimized for React Native, providing faster startup and lower memory usage.
Fabric uses a new layout engine that works in sync with React Fiber. It reduces frame drops by performing layout calculations more efficiently and prioritizing visible UI updates first.
Yes, React Native supports gradual migration. Both the old bridge and new architecture can coexist during transition. This hybrid mode helps teams adopt JSI, TurboModules, and Fabric without breaking existing modules.
The new architecture introduces a unified threading model that allows JavaScript and native layers to share work more efficiently. This means UI updates, animations, and async calls can execute with less overhead and better synchronization across threads.
The new architecture improves performance, enables synchronous native access, and supports concurrent rendering. It also simplifies native integration, reduces bridge latency, and improves developer tooling for debugging and profiling.
First, enable newArchitectureEnabled in gradle.properties (Android) and Podfile (iOS). Then rebuild the app. Ensure that Hermes is enabled and all third-party libraries are compatible with the new architecture before testing Fabric rendering.
By unifying JavaScript and native communication under JSI, React Native becomes more flexible for future enhancements like multithreading and WebAssembly integration. It also opens the door for new rendering techniques and faster hybrid experiences across platforms.
JSI stands for JavaScript Interface. It allows JavaScript code to directly call C++ and native methods without serialization. This results in faster communication between JS and native layers compared to the old JSON bridge.
To enable the new architecture, set newArchitectureEnabled=true in gradle.properties for Android and the equivalent flag in Podfile for iOS. This activates JSI, TurboModules, and Fabric rendering features.