Unlock the Power of React Native 0.65: Performance, Accessibility, and More

Hermes 0.8.1: The Key to Unlocking Android Performance

At the heart of this update lies Hermes 0.8.1, an AOT (ahead of time) JavaScript engine designed to supercharge React Native performance on Android devices. With Hermes, you can say goodbye to slow load times, bulky APK files, and memory-intensive apps.

The Hades Garbage Collector: A New Era of Efficiency

The brilliant minds behind Hermes have introduced Hades, a cutting-edge garbage collector that runs most of its work in a background thread concurrently with the interpreter. This means your app can multitask like never before, resulting in significant improvements in CPU-intensive workloads and pause times.

console.log("Hello, Hades!");

Android Updates: Internationalization APIs and More

Hermes now comes with built-in support for ECMAScript Internationalization API Specification (ECMA-402, or Intl), reducing the size of your app by a whopping 57-62K per API size overhead. However, this update does come with some limitations, including unsupported Intl objects.

• Supported Intl APIs:
  • DateTimeFormat
  • NumberFormat
  • Collator
• Unsupported Intl objects:
  • Intl.PluralRules
  • Intl.RelativeTimeFormat

iOS Updates: Mac Catalyst and Apple M1 Macs

React Native 0.65 brings support for Mac Catalyst, allowing you to seamlessly bring your iOS app to macOS. Additionally, Hermes now supports Apple M1 Macs (ARM64 simulators), making it an exciting time for iPad app developers looking to transition to the Mac.

// Sample Swift code for Mac Catalyst
import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        // Your code here
    }
}

Accessibility Improvements: High-Contrast Light and Dark Values

With this update, you can now set high-contrast light and dark values for iOS, providing a more inclusive experience for users with visual impairments. Here’s how to implement this feature in a basic template project:

// Sample JavaScript code for high-contrast values
import { View, Text } from 'eact-native';

const App = () => {
  return (
    
      
        High-contrast light value
      
    
  );
};

// Sample JavaScript code for high-contrast dark values
import { View, Text } from 'eact-native';

const App = () => {
  return (
    
      
        High-contrast dark value
      
    
  );
};

What’s Next for React Native?

As we look to the future, it’s clear that React Native is poised for greatness. With one JavaScript engine for Android, iOS, and macOS, the possibilities are endless. The partnership with desktop and VR teams only adds to the excitement.

Get started with React Native 0.65 today and unlock a world of possibilities!

Learn more about React Native 0.65