How to Build Your First React Native App

It is more detailed and covers almost every fundamental element of the React Native environment. You will also build a more advanced form of a typical "hello world" app by reviewing the new article.

React Native is a platform for developing mobile apps using JavaScript and ReactJS. It makes use of core UI components. If you are acquainted with React or come from a front end programming experience, you will know that React utilises a virtual DOM that functions as a shadow to the actual DOM that is accessible. 

When an element changes, Virtual DOM uses a node for each element to represent the change on the actual DOM. However, there is no DOM in React Native, instead relying on Native Components supplied by systems such as iOS and Android. There are no online views available here.

When an application is launched, an instance of JavaScriptCore is launched to run JS code. To link native and JavaScript code, React Native employs the RCTBridgeModule. It is expected that as you progress in React Native programming, you will come across the use of a third-party SDK for a particular mobile device. This linking will be extremely beneficial.

Difference between React Native and Reactjs

React Native wraps the native components in its own packaging and does not use every HTML element. For example, View>, which is comparable to HTML's div. This is a significant distinction between React Native and Reactjs. This also implies that you cannot reuse every HTML-rendering library accessible for Reactjs. It has its own set of navigational components.

Platform Specific Designing

Designing a mobile application for multiple devices that use the same collection of code can be difficult. In this situation, a coder or development team has two options. Either they create a user experience that is unique to their app. This implies that the app's user interface appears the same on all platforms. However, this will not be the situation with every app you create. React Native can identify the device you're using and use circumstances to implement styling.

It is beyond the scope of this essay to delve thoroughly into the bridging or platform-specific design sections. This is intended to introduce you with the fundamental React Native ecosystem, but I wanted to cover these topics fast so you know what you're entering into.

Developer Environment for React Native

• These are the dependencies needed to build up a local environment and then create any sort of app on your machine.
• Dependencies needed:
• To proceed, you must have a Node.js version greater than 4.0.
• To configure Native SDKs for particular systems, follow these steps:
• iOS (install/have Xcode, which is free and most likely already loaded)

Android 

The final stage is to run React Native CLI with the following command:

npm install -g react-native-cli

The steps above are ideal if you need to create native code in your app or want to integrate React Native into an existing app. You can use the Create React Native App module, which is very similar to Create React App, to rapidly build an application. It is not necessary to setup the above components and platform-specific SDKs in order to Create React Native App. To see the programme in action, Facebook suggests using the Expo client on your phone. To keep this piece as brief as possible, we will use react-native-cli.

Hello World with React Native

To build an app, use the React Native command line interface that we loaded in the previous stage.

React-native init Helloworld

Cd Helloworld

If you peek inside the subfolder to see the layout, you'll notice something similar:

Before we make any adjustments, let's start the app. I'll use command: because I'm on a Mac.

react-native run-ios

You can use the following command to launch the same app in an Android emulator or device (if connected):

react-native run-android

Because you are executing any of the above commands for the first time, the app may take some time to appear in a simulator. Don't fear, if everything goes well, it will appear.

The code shown above is accessible in App.js:

This code is simple to comprehend if you're acquainted with Reactjs. <View> represents a container element in HTML, such as div, and <Text> represents a <p> in HTML.

You will be presented with a success notification, and Metro Bundler (developed by Facebook) will operate in a separate terminal window until the application stops.

The index.js file in the base directory displays this App component. You will notice the following code:

Because there is no DOM in React Native, there is no react-dom. The AppRegistery is the starting place for a React Native programme. AppRegistry should be used to register the app component or any other core component in the programme.registerComponent so that a native system can import the app's bundle and execute it by beginning AppRegistry.runApplication. You have completed the installation of your first React Native app. by partnering with the Best react native development company, you can ensure a successful journey in building your first app.