Is Facebook iOS app built in React Native? - react-native

I came across an article that gave me the impression that Facebook's iOS app is built in React Native.
Does anyone know if this true?

One of my friend who was interviewed at FB 5 months ago was told that more than 80% of the application is still native.
I realized what is the point of moving over to React Native from Native for big companies? rather stay native and give the best user experience!

Facebook claims:
"Using React Native in the Facebook app".
It means that they have used React Native partially in app. But the point is to what extent they have used React native, no one knows.
So, it seems like most of the core is build in native but they have started implementing new modules in React Native.

It's also easy to build part of your app in React Native, and part of
your app using native code directly - that's how the Facebook app
works.
This is the official words from Facebook. it means Facebook did not use completely react native. it is partially using react native in their apps.

One of the main tabs, Facebook Marketplace, is built with React Native.
https://reactnative.dev/blog/2017/08/07/react-native-performance-in-marketplace

https://reactnative.dev/showcase
Yes it is true. You can see the list of apps in this section.

Related

Can we Develop the website as well with react Native ? is their any way to do it?

I Am new to react and React native but can any one let me know that i can develop
website, App (Android, IOS) from same platform (REACT NATIVE)
I Am asking here because on official site of React Native
https://facebook.github.io/react-native/
they have shown the picture of Mobile, i-pad, And Desktop View as well
so may be there is chance we can develop it in all platform
Thanks in Advance
Web based apps (that load on site pages, in browser) can be built with React JS:
https://reactjs.org
React Native is an entire platform allowing you to build native, cross-platform mobile apps, and React.js is a JavaScript library you use for constructing a high performing UI layer.
React.js is the heart of React Native, and it embodies all React’s principles and syntax, so the learning curve is easy.
React-Native doesn’t use HTML & CSS to render the app, but provides alternative components that work in a similar way.

Can I use components of a web app with a React Native app

I am trying to build an app in react native. The app was originally built in unity, but due to performance reasons. It was decided the app should be rebuilt in react native. The app currently has a web app also and I am wondering if there is a way when that the react native app can use some components from the web app.
I tried to google this problem, but I only find articles about using components between react native and react native web. I do not know what the web app was built with, but I am almost certain that it was not react native web.
What component are you trying to use?
Because if it's a pure unity I think there are some libraries who are not available on a mobile device, so you can't use it.
I have in mid some C++ libraries or third part one to use the sound.

Any documentation about pure React Native without using EXPO?

I want to learn React Native but, without using EXPO
Why do i not using EXPO? (source: Youtube Channel "McAbout Digital")
Lack of support for geolocation
No support for Payment API
Slow image rendering
Limited access to Firebase setting
Advanced animation support
Wherever i google about React Native the EXPO is always there too.
I'm looking for pure react native documentation/tutorial
Apart from project setup almost everything is same in the docs for both versions,
but if you are looking for a good tutorial series you can start learning by
UDEMY - React Native Practical Guid which is a paid course but worth it.

React Native - Using iOS and Android SDKs

I just started using React Native a few days ago and want to build my next iOS/Android app with it. However, I had a question (and I apologize in advance if this question is very basic).
If I am integrating my iOS and Android apps built with React Native, with an external service (like Salesforce for example), how do I go about using the native mobile SDKs they provide for iOS and Android? As in, what do I do to integrate those SDKs into my React Native app? Those SDKs are using native Objective-C and Java code, so how would I be able to use the JS code for React Native? I believe my understanding about this is skewed.
I looked at this link which goes into it, but it seemed very confusing and I had a bit of a hard time grasping the concept (again, I am very new to this - I've done a lot of web development, hence turning my attention to React Native, but I've done no mobile development whatsoever).
If someone could please explain how that works, and point me in the right direction where I can read and learn more, I would sincerely appreciate that!
Thank you!
Checkout out this talk on SalesForce mobile SDK for React native
Official SalesForce Docs - Read Here
Also this tutorial might help you. http://rajaraodv.github.io/salesforce-react-native-tutorial/
Update:
There are react native packages build by open react native community if you couldn't find anything to access native iOS or android functionality you will have to write react native wrapper yourself using react native "Native Modules"
Native Modules

How to use JavaScriptCore in React Native android apps

We are building a React Native application on Android. We have a requirement of creating a separate JSC virtual machine instance in a thread. We do not want to use same JSC context which is used by React Native.
We have searched a lot on web and also tried to figure out how React Native is using JSC, but we are not able to find the same.
It will be very helpful if anyone can suggest us directions for the same.
Perhaps you should take a look at this:
ericwlange/AndroidJSCore
or dive deep into React Native's Android source code.
https://github.com/facebook/react-native/blob/master/ReactAndroid/src/main/jni/react/JSCExecutor.cpp