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Table of contents
1.
Introduction
2.
React Native State
2.1.
Uses
2.2.
Advantages
2.3.
Example
2.4.
Output
3.
Frequently Asked Questions
3.1.
What happens when the state changes in React Native?
3.2.
Is React Native State mutable?
3.3.
In React Native, how is the state value changed?
3.4.
Why is State used instead of a variable in React Native?
3.5.
What is the difference between State and props In React Native?
4.
Conclusion
Last Updated: Mar 27, 2024

React Native State

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Introduction

React Native is used in the building of hybrid mobile apps. The React Native is a user interface (UI) design tool by Facebook. It is compatible with both IOS (iPhone Operating System) and Android OS platforms. React Native enables developers to create apps in the same way JavaScript does but at a considerably faster pace. React Native combines the most significant aspects of native programming with React, a world-class JavaScript toolkit for creating user interfaces.
This article will introduce you to the State, a key concept in React. A component's data is stored in React State. In turn, the component sends the data contained in the State to the output.

Recommended Topic, React Native Paper, React devtools

React Native State

State is a primary attribute of React Native, which is mutable in nature. This signifies that its values are changeable within the component. It provides a sophisticated framework for managing the data available inside any component from the beginning to the end of the component's life cycle. A state is an object with all the required data to create a component paired with HTML. When the state changes, the render function is called. If the State of a textbox changes, the render function is invoked to display the necessary adjustments. In general, all states are initialized within the constructor function.

Uses

We can see the uses of React Native State below.

  • We can use React Native Status to track the State of a function component.
  • React Native State can hold data or information about the component. The Data can be modified during the component's lifespan.
  • It can be used to alter the appearance of an application. React Native State can be used to re-render the component and any of its descendant components.
  • React Native State can be used to represent information about the current state of the component.

Advantages

The  Advantages of React Native State can be seen below.

  • States are similar to global variables for any component. As a result, they are available anywhere within the specified components and can be used for various reasons.
  • Because React Native manages the State, they handle memory management very well in many practical scenarios.
  • With the aid of React Native State, it is simple to manage changes and different states of apps.
  • React Native State is also private to its component and might be changed within it. States are secure within any component because they are private within it.
  • Variables within the React Native States are simple to manipulate. There is no issue if multiple components have the same variable name.

Also see,  React Native Reanimated

Example

We will look into an example of 'React Native State'. 

import React,{useState} from 'react';
import {Button, StyleSheet,Text,View} from 'react-native';
export default function App(){
const [name,setName] = useState("Programming")
const [tutor,setTutor] = useState({name: "Unknown",year: "Unknown"})
const clickMe = () =>{
 setName("Platform")
 setTutor({name: "Coding Ninjas", year: 2016})
}
 return (
   <View style={styles.container}>
     <Text>{name}</Text>
     <Text>My  name is {tutor.name} and created in {tutor.year}</Text>
     <View style={styles.button}>
     <Button title="change" color="Black" onPress={clickMe}/>
     </View>
   </View>
 );
}
const styles = StyleSheet.create({
 container: {
   flex:1,
   backgroundColor: 'white',
   alignItems: 'center',
   justifyContent: 'center',
 },
 button:{
   backgroundColor: "red",
   padding: 10,
   margin: 20
 }
});

Output

We will be getting an output displaying the module screen. It makes us sure that the interface is ready. Here the "CHANGE" button acts as a trigger. This trigger changes the State and re-renders it to the updated State.

The first State shows the message "My name is Unknown and created in Unknown". 

We can see that, on clicking the change button in the module, the state changes and the new message is displayed, which says, "My name is Coding Ninjas and created in 2016".

Check out Advantages of React JS here.

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Frequently Asked Questions

What happens when the state changes in React Native?

A state object is built into React components. As the State object is where the components' property values are kept, the changes make a difference. The component re-renders when the state object changes. 

Is React Native State mutable?

In React Native components, the State can be changed. We use it in many React Native components to make the applications interactive. A value is assigned to the State. We utilize the setState method to update the component's state based on user interaction with the application.

In React Native, how is the state value changed?

In React Native Components, State can be changed. "State" is used in almost every react component to make React apps interactive. A value is assigned to the state. At some point, we update the component's state based on user interaction with the application.

Why is State used instead of a variable in React Native?

Though State appears to be a class variable, it is a protected keyword in React that refers to component data that has been saved. The primary distinction between utilizing class variables and state variables is data updating. We use this instead of manually reassigning the variable.

What is the difference between State and props In React Native?

In React Native, Props are used to transfer information from one component to another. React Native State is a type of local data storage that is unique to the component and cannot be shared with other components.

Conclusion

We discussed the working of React Native State in this article. Using an example, we learnt how to initialize the state. We have also discussed the uses and advantages of React Native State and answered some interesting questions about it. 
You can try our React.js courses on Front-End Web Development for free. Follow us to check out more blogs on React-Native.


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