What is React Native?
Facebook released React Native as an open-source project in 2015, and now Instagram, Facebook, and Skype are all built with React Native.
What’s the difference between React Native and React?
Why do you need React Native?
The Bridge, therefore, plays an important role in this communication among the threads, resulting in overreliance and lag, leading to a lot of uncertainty. The current React Native architecture has several other flaws. Firstly, the Bridge depends upon thread communication, and it also necessitates more copying rather than sharing memory between app threads. The asynchronous model has no guarantees that the message will get to its destination on time and the transmission of data in this model is usually slow. Unexpected page jumps are common due to asynchronous UI updates.
To all these old problems, React Native’s new architecture provides an elegant solution. The architecture of the application was already in process since the second quarter of 2018 when RN was still in its early stages.
It’s important to understand some basic terms used to understand this technology before we get into the nitty-gritty.
This tool converts JS code into byte-code.
Build time/compiled time
It is the time when source code is converted into executable code.
When the code is executed.
New updates in the React Native Architecture
Hermes also contributes a significant reduction in bundle size, load time, and a GUI for visualising your application’s performance metrics during its development. This feature is used by developers who want to learn about the way their application is performing after release and in production.
Hermes will also be in charge of garbage collection. For this, it employs GenGC. The previous default GC for Hermes was Generational Garbage Collector, which was single-threaded and had long GC delays because it worked in the Main JS thread. Reports say there is a 200ms average pause and, at times, even 7sec. The older model, which used a mark-compact strategy, has a number of shortcomings. To address them, they implemented Hades, a Concurrent GC. Hades GC runs in the background thread alongside the interpreter, which runs JS code. Its main goal is to achieve those short pause times. It employs the Mark-Sweep Collector technique. The new generation makes use of a standard semi-space copying strategy to improve its ability to return memory to the operating system.
Several improvements to the React Native build and development process are also included in 0.70.
Auto-linking for New Architecture Libraries in Android
CMake support for Andriod
Instead of relying on the less common NDK build system, the new release adds full CMake support for Android builds. Smaller configuration files and easier-to-maintain and upgrade support with a more sophisticated CMake ecosystem are all part of these recent changes.
All of these changes improve the developer workflow, particularly for building Android apps. It remarkably improves consistency between both the iOS and Android build, assisting in achieving React Native’s valid claim as a smooth cross-platform technology platform.
Codegen will define the interface components used by Turbomodules and Fabric. All of this is intended to remove the need for reusing code and enable data transfer without difficulty and far more rapidly because data validation is no longer required at each iterative process.
Removing the Bridge
How to Upgrade
The new architecture is becoming easier to use with each RN release, but it’s still important to be aware of the changes and how they may affect your specific application. Upgrading React Native can be difficult because changes are sometimes required in a variety of locations, sometimes in the Android and iOS build folders. The React Native Upgrade Helper is always the best way to upgrade a React Native project, and it displays the exact file difference between your current version and the target version. Make sure to go through the documentation, particularly the section on Migrating to the New Architecture.