Top React Native Interview Questions for Job Seekers

Here’s an example to call a web service to React Native.

fetch('http://**someurl**', {
method: 'POST',
headers: {
   'Accept': 'application/json',
   'Content-Type': 'application/json',
},
body: JSON.stringify({
   username : "admin1",
   password: "admin13",
})
})

• Add this code in the component.js file destination file
  import Title from './src/components/importcomponentdemo';
• Here’s the complete code:
  import React from 'react';
import { AppRegistry } from 'react-native';
import App from './src/components/importcomponentdemo';
const App = () => (
   <Title />
);
AppRegistry.registerComponent('ComponentDemo', () => App);

Advantages of using React native

• Conveniently uses the client as well as server side
• Superbly cost effective and code reuse
• Better code readability because of JSX use
• Easy to integrate with other significant frameworks
• Easy to write UI test cases because of React

Redux is a standalone state management library present in React Native and can be used combined with any framework or library. With the use of Redux, app developers can use one application state as a global state and interact with the state from any react component will be easy.

NOTE: If you are looking Redux Interview Questions then you can visit here.

The interaction Manager works on a long-running schedule after any interactions/animations have been completed. In particular, to run smoothly this allows Javascript animations.

It is important because it creates an interaction 'handle' on animation start, and clearing it upon completion in applications to register animations.

import React from 'react';
import { View, Text } from 'react-native';
import { createAppContainer } from 'react-navigation';
import { createStackNavigator } from 'react-navigation-stack';
class HomePage extends React.Component {
render() {
    return (
       <view>
         <text>Home Page</text></view>
    );
}
}
class DetailPage extends React.Component{
    render(){
        return (
           <view>
              <text>Detail Page</text></view>

        )
    }
}
const AppNavigator = createStackNavigator({
   Home: HomePage,
   Details: DetailPage,
},
{
    initialRouteName: 'Home',
});
export default createAppContainer(AppNavigator);

The Stylesheet.create function in React Native is used for the following:

• It validates the keys and registers them to React
• It creates a StyleSheet style reference from the specified object.
• It allows you to send the style only once through the bridge while referring to all subsequent users through ID.

Short form for “reference”, Refs are used to access underlying DOM nodes or React elements within a React component.

JSX stands for JavaScript XML

It allows us to write HTML elements in React and place them in the DOM without any createElement() and/orappendChild() methods.JSX also converts HTML tags into react elements and makes it easier to write.

It is an entry point of JavaScript which is used to run all the apps to React Native. All the components of the App root must register themselves with AppRegistry.registerComponent(), after that the native system will be able to load the bundle regarding the app. After that, they can run the app simply by invoking AppRegistry.runApplication().